A Segmentation fault in adc.c:41

[seviezhou]

System info

Ubuntu X64, gcc (Ubuntu 5.5.0-12ubuntu1), dmg2img (latest master f16f24)

Command line

./dmg2img -i @@ -o /dev/null

Output

Segmentation fault

AddressSanitizer output

==66194==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x7fd23fcfd7ff at pc 0x00000040fa3e bp 0x7fff01a7acb0 sp 0x7fff01a7aca0
READ of size 1 at 0x7fd23fcfd7ff thread T0
    #0 0x40fa3d in adc_decompress /home/seviezhou/dmg2img/adc.c:41
    #1 0x405cad in main /home/seviezhou/dmg2img/dmg2img.c:571
    #2 0x7fd242ef383f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2083f)
    #3 0x408108 in _start (/home/seviezhou/dmg2img/dmg2img+0x408108)

0x7fd23fcfd7ff is located 1 bytes to the left of 1048576-byte region [0x7fd23fcfd800,0x7fd23fdfd800)
allocated by thread T0 here:
    #0 0x7fd24375f602 in malloc (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x98602)
    #1 0x403f95 in main /home/seviezhou/dmg2img/dmg2img.c:371

SUMMARY: AddressSanitizer: heap-buffer-overflow /home/seviezhou/dmg2img/adc.c:41 adc_decompress
Shadow bytes around the buggy address:
  0x0ffac7f97aa0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0ffac7f97ab0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0ffac7f97ac0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0ffac7f97ad0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0ffac7f97ae0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
=>0x0ffac7f97af0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa[fa]
  0x0ffac7f97b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0ffac7f97b10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0ffac7f97b20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0ffac7f97b30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0ffac7f97b40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07
  Heap left redzone:       fa
  Heap right redzone:      fb
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack partial redzone:   f4
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
==66194==ABORTING

POC

heap-overflow-adc-41.zip