heap-buffer-overflow (READ of size 1) in lexer.hpp

[geeknik]

tested commit ceef4cd, compiled with clang 8 and address sanitizer.

echo "J1w=" | base64 -d | ./sassc

==4583==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x602000000013 at pc 0x0000007e5778 bp 0x7fffac5c5af0 sp 0x7fffac5c5ae8
READ of size 1 at 0x602000000013 thread T0
    #0 0x7e5777 in char const* Sass::Prelexer::exactly<(char)92>(char const*) /root/libsass/src/lexer.hpp:93:14
    #1 0x7e5777 in char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::exactly<(char)92>(char const*)), &Sass::Prelexer::re_linebreak>(char const*) /root/libsass/src/lexer.hpp:227
    #2 0x7e5777 in char const* Sass::Prelexer::alternatives<&(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::exactly<(char)92>(char const*)), &Sass::Prelexer::re_linebreak>(char const*)), &Sass::Prelexer::escape_seq, &Sass::Prelexer::unicode_seq, &Sass::Prelexer::interpolant, &(char const* Sass::Prelexer::any_char_but<(char)39>(char const*))>(char const*) /root/libsass/src/lexer.hpp:211
    #3 0x7e5777 in char const* Sass::Prelexer::zero_plus<&(char const* Sass::Prelexer::alternatives<&(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::exactly<(char)92>(char const*)), &Sass::Prelexer::re_linebreak>(char const*)), &Sass::Prelexer::escape_seq, &Sass::Prelexer::unicode_seq, &Sass::Prelexer::interpolant, &(char const* Sass::Prelexer::any_char_but<(char)39>(char const*))>(char const*))>(char const*) /root/libsass/src/lexer.hpp:245
    #4 0x7e5777 in char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::zero_plus<&(char const* Sass::Prelexer::alternatives<&(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::exactly<(char)92>(char const*)), &Sass::Prelexer::re_linebreak>(char const*)), &Sass::Prelexer::escape_seq, &Sass::Prelexer::unicode_seq, &Sass::Prelexer::interpolant, &(char const* Sass::Prelexer::any_char_but<(char)39>(char const*))>(char const*))>(char const*)), &(char const* Sass::Prelexer::exactly<(char)39>(char const*))>(char const*) /root/libsass/src/lexer.hpp:227
    #5 0x7e5777 in char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::exactly<(char)39>(char const*)), &(char const* Sass::Prelexer::zero_plus<&(char const* Sass::Prelexer::alternatives<&(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::exactly<(char)92>(char const*)), &Sass::Prelexer::re_linebreak>(char const*)), &Sass::Prelexer::escape_seq, &Sass::Prelexer::unicode_seq, &Sass::Prelexer::interpolant, &(char const* Sass::Prelexer::any_char_but<(char)39>(char const*))>(char const*))>(char const*)), &(char const* Sass::Prelexer::exactly<(char)39>(char const*))>(char const*) /root/libsass/src/lexer.hpp:228
    #6 0x7e5777 in Sass::Prelexer::single_quoted_string(char const*) /root/libsass/src/prelexer.cpp:513
    #7 0x7e5777 in char const* Sass::Prelexer::alternatives<&Sass::Prelexer::single_quoted_string, &Sass::Prelexer::double_quoted_string>(char const*) /root/libsass/src/lexer.hpp:211
    #8 0x7fcd2d in Sass::Prelexer::quoted_string(char const*) /root/libsass/src/prelexer.cpp:561:14
    #9 0x7fcd2d in char const* Sass::Prelexer::alternatives<&Sass::Prelexer::quoted_string, &Sass::Prelexer::interpolant, &Sass::Prelexer::identifier, &Sass::Prelexer::variable, &Sass::Prelexer::percentage, &Sass::Prelexer::binomial, &Sass::Prelexer::dimension, &Sass::Prelexer::alnum>(char const*) /root/libsass/src/lexer.hpp:211
    #10 0x7fcd2d in char const* Sass::Prelexer::alternatives<&(char const* Sass::Prelexer::exactly<(char)42>(char const*)), &Sass::Prelexer::quoted_string, &Sass::Prelexer::interpolant, &Sass::Prelexer::identifier, &Sass::Prelexer::variable, &Sass::Prelexer::percentage, &Sass::Prelexer::binomial, &Sass::Prelexer::dimension, &Sass::Prelexer::alnum>(char const*) /root/libsass/src/lexer.hpp:212
    #11 0x7fcd2d in char const* Sass::Prelexer::alternatives<&Sass::Prelexer::kwd_optional, &(char const* Sass::Prelexer::exactly<(char)42>(char const*)), &Sass::Prelexer::quoted_string, &Sass::Prelexer::interpolant, &Sass::Prelexer::identifier, &Sass::Prelexer::variable, &Sass::Prelexer::percentage, &Sass::Prelexer::binomial, &Sass::Prelexer::dimension, &Sass::Prelexer::alnum>(char const*) /root/libsass/src/lexer.hpp:212
    #12 0x7fcd2d in char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::alternatives<&Sass::Prelexer::kwd_optional, &(char const* Sass::Prelexer::exactly<(char)42>(char const*)), &Sass::Prelexer::quoted_string, &Sass::Prelexer::interpolant, &Sass::Prelexer::identifier, &Sass::Prelexer::variable, &Sass::Prelexer::percentage, &Sass::Prelexer::binomial, &Sass::Prelexer::dimension, &Sass::Prelexer::alnum>(char const*))>(char const*) /root/libsass/src/lexer.hpp:221
    #13 0x7fcd2d in char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::zero_plus<&(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::exactly<(char)45>(char const*)), &Sass::Prelexer::optional_spaces>(char const*))>(char const*)), &(char const* Sass::Prelexer::alternatives<&Sass::Prelexer::kwd_optional, &(char const* Sass::Prelexer::exactly<(char)42>(char const*)), &Sass::Prelexer::quoted_string, &Sass::Prelexer::interpolant, &Sass::Prelexer::identifier, &Sass::Prelexer::variable, &Sass::Prelexer::percentage, &Sass::Prelexer::binomial, &Sass::Prelexer::dimension, &Sass::Prelexer::alnum>(char const*))>(char const*) /root/libsass/src/lexer.hpp:228
    #14 0x7fc947 in char const* Sass::Prelexer::one_plus<&(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::zero_plus<&(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::exactly<(char)45>(char const*)), &Sass::Prelexer::optional_spaces>(char const*))>(char const*)), &(char const* Sass::Prelexer::alternatives<&Sass::Prelexer::kwd_optional, &(char const* Sass::Prelexer::exactly<(char)42>(char const*)), &Sass::Prelexer::quoted_string, &Sass::Prelexer::interpolant, &Sass::Prelexer::identifier, &Sass::Prelexer::variable, &Sass::Prelexer::percentage, &Sass::Prelexer::binomial, &Sass::Prelexer::dimension, &Sass::Prelexer::alnum>(char const*))>(char const*))>(char const*) /root/libsass/src/lexer.hpp:253:23
    #15 0x7fc947 in char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::one_plus<&(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::zero_plus<&(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::exactly<(char)45>(char const*)), &Sass::Prelexer::optional_spaces>(char const*))>(char const*)), &(char const* Sass::Prelexer::alternatives<&Sass::Prelexer::kwd_optional, &(char const* Sass::Prelexer::exactly<(char)42>(char const*)), &Sass::Prelexer::quoted_string, &Sass::Prelexer::interpolant, &Sass::Prelexer::identifier, &Sass::Prelexer::variable, &Sass::Prelexer::percentage, &Sass::Prelexer::binomial, &Sass::Prelexer::dimension, &Sass::Prelexer::alnum>(char const*))>(char const*))>(char const*)), &(char const* Sass::Prelexer::zero_plus<&(char const* Sass::Prelexer::exactly<(char)45>(char const*))>(char const*))>(char const*) /root/libsass/src/lexer.hpp:227
    #16 0x7fc947 in char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::alternatives<&(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::exactly<(char)35>(char const*)), &(char const* Sass::Prelexer::negate<&(char const* Sass::Prelexer::exactly<(char)123>(char const*))>(char const*))>(char const*)), &(char const* Sass::Prelexer::exactly<(char)46>(char const*)), &(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::optional<&Sass::Prelexer::pseudo_prefix>(char const*)), &(char const* Sass::Prelexer::negate<&Sass::Prelexer::uri_prefix>(char const*))>(char const*))>(char const*)), &(char const* Sass::Prelexer::one_plus<&(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::zero_plus<&(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::exactly<(char)45>(char const*)), &Sass::Prelexer::optional_spaces>(char const*))>(char const*)), &(char const* Sass::Prelexer::alternatives<&Sass::Prelexer::kwd_optional, &(char const* Sass::Prelexer::exactly<(char)42>(char const*)), &Sass::Prelexer::quoted_string, &Sass::Prelexer::interpolant, &Sass::Prelexer::identifier, &Sass::Prelexer::variable, &Sass::Prelexer::percentage, &Sass::Prelexer::binomial, &Sass::Prelexer::dimension, &Sass::Prelexer::alnum>(char const*))>(char const*))>(char const*)), &(char const* Sass::Prelexer::zero_plus<&(char const* Sass::Prelexer::exactly<(char)45>(char const*))>(char const*))>(char const*) /root/libsass/src/lexer.hpp:228
    #17 0x7fc947 in char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::optional<&Sass::Prelexer::namespace_schema>(char const*)), &(char const* Sass::Prelexer::alternatives<&(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::exactly<(char)35>(char const*)), &(char const* Sass::Prelexer::negate<&(char const* Sass::Prelexer::exactly<(char)123>(char const*))>(char const*))>(char const*)), &(char const* Sass::Prelexer::exactly<(char)46>(char const*)), &(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::optional<&Sass::Prelexer::pseudo_prefix>(char const*)), &(char const* Sass::Prelexer::negate<&Sass::Prelexer::uri_prefix>(char const*))>(char const*))>(char const*)), &(char const* Sass::Prelexer::one_plus<&(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::zero_plus<&(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::exactly<(char)45>(char const*)), &Sass::Prelexer::optional_spaces>(char const*))>(char const*)), &(char const* Sass::Prelexer::alternatives<&Sass::Prelexer::kwd_optional, &(char const* Sass::Prelexer::exactly<(char)42>(char const*)), &Sass::Prelexer::quoted_string, &Sass::Prelexer::interpolant, &Sass::Prelexer::identifier, &Sass::Prelexer::variable, &Sass::Prelexer::percentage, &Sass::Prelexer::binomial, &Sass::Prelexer::dimension, &Sass::Prelexer::alnum>(char const*))>(char const*))>(char const*)), &(char const* Sass::Prelexer::zero_plus<&(char const* Sass::Prelexer::exactly<(char)45>(char const*))>(char const*))>(char const*) /root/libsass/src/lexer.hpp:228
    #18 0x7fc0f6 in char const* Sass::Prelexer::alternatives<&Sass::Prelexer::line_comment, &Sass::Prelexer::schema_reference_combinator, &(char const* Sass::Prelexer::class_char<&Sass::Constants::selector_lookahead_ops>(char const*)), &(char const* Sass::Prelexer::class_char<&Sass::Constants::selector_combinator_ops>(char const*)), &(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::exactly<(char)40>(char const*)), &Sass::Prelexer::optional_spaces, &(char const* Sass::Prelexer::optional<&Sass::Prelexer::re_selector_list>(char const*)), &Sass::Prelexer::optional_spaces, &(char const* Sass::Prelexer::exactly<(char)41>(char const*))>(char const*)), &(char const* Sass::Prelexer::alternatives<&Sass::Prelexer::exact_match, &Sass::Prelexer::class_match, &Sass::Prelexer::dash_match, &Sass::Prelexer::prefix_match, &Sass::Prelexer::suffix_match, &Sass::Prelexer::substring_match>(char const*)), &(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::optional<&Sass::Prelexer::namespace_schema>(char const*)), &(char const* Sass::Prelexer::alternatives<&(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::exactly<(char)35>(char const*)), &(char const* Sass::Prelexer::negate<&(char const* Sass::Prelexer::exactly<(char)123>(char const*))>(char const*))>(char const*)), &(char const* Sass::Prelexer::exactly<(char)46>(char const*)), &(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::optional<&Sass::Prelexer::pseudo_prefix>(char const*)), &(char const* Sass::Prelexer::negate<&Sass::Prelexer::uri_prefix>(char const*))>(char const*))>(char const*)), &(char const* Sass::Prelexer::one_plus<&(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::zero_plus<&(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::exactly<(char)45>(char const*)), &Sass::Prelexer::optional_spaces>(char const*))>(char const*)), &(char const* Sass::Prelexer::alternatives<&Sass::Prelexer::kwd_optional, &(char const* Sass::Prelexer::exactly<(char)42>(char const*)), &Sass::Prelexer::quoted_string, &Sass::Prelexer::interpolant, &Sass::Prelexer::identifier, &Sass::Prelexer::variable, &Sass::Prelexer::percentage, &Sass::Prelexer::binomial, &Sass::Prelexer::dimension, &Sass::Prelexer::alnum>(char const*))>(char const*))>(char const*)), &(char const* Sass::Prelexer::zero_plus<&(char const* Sass::Prelexer::exactly<(char)45>(char const*))>(char const*))>(char const*))>(char const*) /root/libsass/src/lexer.hpp:212:14
    #19 0x7fc0f6 in char const* Sass::Prelexer::alternatives<&Sass::Prelexer::block_comment, &Sass::Prelexer::line_comment, &Sass::Prelexer::schema_reference_combinator, &(char const* Sass::Prelexer::class_char<&Sass::Constants::selector_lookahead_ops>(char const*)), &(char const* Sass::Prelexer::class_char<&Sass::Constants::selector_combinator_ops>(char const*)), &(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::exactly<(char)40>(char const*)), &Sass::Prelexer::optional_spaces, &(char const* Sass::Prelexer::optional<&Sass::Prelexer::re_selector_list>(char const*)), &Sass::Prelexer::optional_spaces, &(char const* Sass::Prelexer::exactly<(char)41>(char const*))>(char const*)), &(char const* Sass::Prelexer::alternatives<&Sass::Prelexer::exact_match, &Sass::Prelexer::class_match, &Sass::Prelexer::dash_match, &Sass::Prelexer::prefix_match, &Sass::Prelexer::suffix_match, &Sass::Prelexer::substring_match>(char const*)), &(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::optional<&Sass::Prelexer::namespace_schema>(char const*)), &(char const* Sass::Prelexer::alternatives<&(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::exactly<(char)35>(char const*)), &(char const* Sass::Prelexer::negate<&(char const* Sass::Prelexer::exactly<(char)123>(char const*))>(char const*))>(char const*)), &(char const* Sass::Prelexer::exactly<(char)46>(char const*)), &(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::optional<&Sass::Prelexer::pseudo_prefix>(char const*)), &(char const* Sass::Prelexer::negate<&Sass::Prelexer::uri_prefix>(char const*))>(char const*))>(char const*)), &(char const* Sass::Prelexer::one_plus<&(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::zero_plus<&(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::exactly<(char)45>(char const*)), &Sass::Prelexer::optional_spaces>(char const*))>(char const*)), &(char const* Sass::Prelexer::alternatives<&Sass::Prelexer::kwd_optional, &(char const* Sass::Prelexer::exactly<(char)42>(char const*)), &Sass::Prelexer::quoted_string, &Sass::Prelexer::interpolant, &Sass::Prelexer::identifier, &Sass::Prelexer::variable, &Sass::Prelexer::percentage, &Sass::Prelexer::binomial, &Sass::Prelexer::dimension, &Sass::Prelexer::alnum>(char const*))>(char const*))>(char const*)), &(char const* Sass::Prelexer::zero_plus<&(char const* Sass::Prelexer::exactly<(char)45>(char const*))>(char const*))>(char const*))>(char const*) /root/libsass/src/lexer.hpp:212
    #20 0x7fc0f6 in char const* Sass::Prelexer::alternatives<&Sass::Prelexer::spaces, &Sass::Prelexer::block_comment, &Sass::Prelexer::line_comment, &Sass::Prelexer::schema_reference_combinator, &(char const* Sass::Prelexer::class_char<&Sass::Constants::selector_lookahead_ops>(char const*)), &(char const* Sass::Prelexer::class_char<&Sass::Constants::selector_combinator_ops>(char const*)), &(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::exactly<(char)40>(char const*)), &Sass::Prelexer::optional_spaces, &(char const* Sass::Prelexer::optional<&Sass::Prelexer::re_selector_list>(char const*)), &Sass::Prelexer::optional_spaces, &(char const* Sass::Prelexer::exactly<(char)41>(char const*))>(char const*)), &(char const* Sass::Prelexer::alternatives<&Sass::Prelexer::exact_match, &Sass::Prelexer::class_match, &Sass::Prelexer::dash_match, &Sass::Prelexer::prefix_match, &Sass::Prelexer::suffix_match, &Sass::Prelexer::substring_match>(char const*)), &(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::optional<&Sass::Prelexer::namespace_schema>(char const*)), &(char const* Sass::Prelexer::alternatives<&(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::exactly<(char)35>(char const*)), &(char const* Sass::Prelexer::negate<&(char const* Sass::Prelexer::exactly<(char)123>(char const*))>(char const*))>(char const*)), &(char const* Sass::Prelexer::exactly<(char)46>(char const*)), &(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::optional<&Sass::Prelexer::pseudo_prefix>(char const*)), &(char const* Sass::Prelexer::negate<&Sass::Prelexer::uri_prefix>(char const*))>(char const*))>(char const*)), &(char const* Sass::Prelexer::one_plus<&(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::zero_plus<&(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::exactly<(char)45>(char const*)), &Sass::Prelexer::optional_spaces>(char const*))>(char const*)), &(char const* Sass::Prelexer::alternatives<&Sass::Prelexer::kwd_optional, &(char const* Sass::Prelexer::exactly<(char)42>(char const*)), &Sass::Prelexer::quoted_string, &Sass::Prelexer::interpolant, &Sass::Prelexer::identifier, &Sass::Prelexer::variable, &Sass::Prelexer::percentage, &Sass::Prelexer::binomial, &Sass::Prelexer::dimension, &Sass::Prelexer::alnum>(char const*))>(char const*))>(char const*)), &(char const* Sass::Prelexer::zero_plus<&(char const* Sass::Prelexer::exactly<(char)45>(char const*))>(char const*))>(char const*))>(char const*) /root/libsass/src/lexer.hpp:212
    #21 0x7fc0f6 in char const* Sass::Prelexer::one_plus<&(char const* Sass::Prelexer::alternatives<&Sass::Prelexer::spaces, &Sass::Prelexer::block_comment, &Sass::Prelexer::line_comment, &Sass::Prelexer::schema_reference_combinator, &(char const* Sass::Prelexer::class_char<&Sass::Constants::selector_lookahead_ops>(char const*)), &(char const* Sass::Prelexer::class_char<&Sass::Constants::selector_combinator_ops>(char const*)), &(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::exactly<(char)40>(char const*)), &Sass::Prelexer::optional_spaces, &(char const* Sass::Prelexer::optional<&Sass::Prelexer::re_selector_list>(char const*)), &Sass::Prelexer::optional_spaces, &(char const* Sass::Prelexer::exactly<(char)41>(char const*))>(char const*)), &(char const* Sass::Prelexer::alternatives<&Sass::Prelexer::exact_match, &Sass::Prelexer::class_match, &Sass::Prelexer::dash_match, &Sass::Prelexer::prefix_match, &Sass::Prelexer::suffix_match, &Sass::Prelexer::substring_match>(char const*)), &(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::optional<&Sass::Prelexer::namespace_schema>(char const*)), &(char const* Sass::Prelexer::alternatives<&(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::exactly<(char)35>(char const*)), &(char const* Sass::Prelexer::negate<&(char const* Sass::Prelexer::exactly<(char)123>(char const*))>(char const*))>(char const*)), &(char const* Sass::Prelexer::exactly<(char)46>(char const*)), &(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::optional<&Sass::Prelexer::pseudo_prefix>(char const*)), &(char const* Sass::Prelexer::negate<&Sass::Prelexer::uri_prefix>(char const*))>(char const*))>(char const*)), &(char const* Sass::Prelexer::one_plus<&(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::zero_plus<&(char const* Sass::Prelexer::sequence<&(char const* Sass::Prelexer::exactly<(char)45>(char const*)), &Sass::Prelexer::optional_spaces>(char const*))>(char const*)), &(char const* Sass::Prelexer::alternatives<&Sass::Prelexer::kwd_optional, &(char const* Sass::Prelexer::exactly<(char)42>(char const*)), &Sass::Prelexer::quoted_string, &Sass::Prelexer::interpolant, &Sass::Prelexer::identifier, &Sass::Prelexer::variable, &Sass::Prelexer::percentage, &Sass::Prelexer::binomial, &Sass::Prelexer::dimension, &Sass::Prelexer::alnum>(char const*))>(char const*))>(char const*)), &(char const* Sass::Prelexer::zero_plus<&(char const* Sass::Prelexer::exactly<(char)45>(char const*))>(char const*))>(char const*))>(char const*))>(char const*) /root/libsass/src/lexer.hpp:253
    #22 0x70119e in char const* Sass::Parser::peek<&Sass::Prelexer::re_selector_list>(char const*) /root/libsass/src/parser.hpp:137:27
    #23 0x70119e in Sass::Parser::lookahead_for_selector(char const*) /root/libsass/src/parser.cpp:2806
    #24 0x6da1e9 in Sass::Parser::parse_block_node(bool) /root/libsass/src/parser.cpp:274:28
    #25 0x6d1e0b in Sass::Parser::parse_block_nodes(bool) /root/libsass/src/parser.cpp:196:11
    #26 0x6cdf49 in Sass::Parser::parse() /root/libsass/src/parser.cpp:122:5
    #27 0x5795b1 in Sass::Context::register_resource(Sass::Include const&, Sass::Resource const&) /root/libsass/src/context.cpp:332:24
    #28 0x58fc4c in Sass::Data_Context::parse() /root/libsass/src/context.cpp:644:5
    #29 0x53eacc in Sass::sass_parse_block(Sass_Compiler*) /root/libsass/src/sass_context.cpp:234:31
    #30 0x53eacc in sass_compiler_parse /root/libsass/src/sass_context.cpp:483
    #31 0x53dd88 in sass_compile_context(Sass_Context*, Sass::Context*) /root/libsass/src/sass_context.cpp:371:7
    #32 0x53dbbe in sass_compile_data_context /root/libsass/src/sass_context.cpp:456:12
    #33 0x532c67 in compile_stdin /root/sassc/sassc.c:138:5
    #34 0x5339a2 in main /root/sassc/sassc.c:377:18
    #35 0x7f7c3dee62e0 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x202e0)
    #36 0x45b209 in _start (/root/sassc/bin/sassc+0x45b209)

0x602000000013 is located 0 bytes to the right of 3-byte region [0x602000000010,0x602000000013)
allocated by thread T0 here:
    #0 0x503dd2 in realloc /b/swarming/w/ir/kitchen-workdir/src/third_party/llvm/compiler-rt/lib/asan/asan_malloc_linux.cc:165:3
    #1 0x532b9b in compile_stdin /root/sassc/sassc.c:112:25
    #2 0x5339a2 in main /root/sassc/sassc.c:377:18
    #3 0x7f7c3dee62e0 in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x202e0)

SUMMARY: AddressSanitizer: heap-buffer-overflow /root/libsass/src/lexer.hpp:93:14 in char const* Sass::Prelexer::exactly<(char)92>(char const*)

[fgeek]

Reproduced.