Potential Uninitialized Memory Read in `InterfaceAddress` from `InterfaceAddressIterator

[quitbug]

trafficstars

Hi, I've found a memory issue in this crate for potential vulnerabilities. It seems that the InterfaceAddress object produced by the InterfaceAddressIterator may lead to reading from uninitialized memory. This could potentially cause undefined behavior or potential vulnerabilities.

To Reproduce Steps to reproduce the behavior:

1. nix-0.29.0 on ubuntu 20.04
2. run the below test case.

fn test_unit_read() {
    let mut addrs = getifaddrs().unwrap();
    let iface = addrs.next().unwrap();
    println!("{:?}", iface.address);
}

run the valgrind and its output is below:

==583716== Command: target/debug/test1
==583716==
==583716== Conditional jump or move depends on uninitialised value(s)
==583716==    at 0x15219A: fmt_u64 (num.rs:234)
==583716==    by 0x15219A: core::fmt::num::imp::<impl core::fmt::Display for u64>::fmt (num.rs:291)
==583716==    by 0x116569: core::fmt::num::<impl core::fmt::Debug for usize>::fmt (num.rs:195)
==583716==    by 0x14E621: {closure#0} (builders.rs:133)
==583716==    by 0x14E621: {closure#0}<core::fmt::builders::{impl#3}::field::{closure_env#0}> (builders.rs:162)
==583716==    by 0x14E621: and_then<(), core::fmt::Error, (), core::fmt::builders::{impl#3}::field_with::{closure_env#0}<core::fmt::builders::{impl#3}::field::{closure_env#0}>> (result.rs:1321)
==583716==    by 0x14E621: field_with<core::fmt::builders::{impl#3}::field::{closure_env#0}> (builders.rs:145)
==583716==    by 0x14E621: core::fmt::builders::DebugStruct::field (builders.rs:133)
==583716==    by 0x11660E: <libc::unix::linux_like::sockaddr_storage as core::fmt::Debug>::fmt (mod.rs:371)
==583716==    by 0x14E621: {closure#0} (builders.rs:133)
==583716==    by 0x14E621: {closure#0}<core::fmt::builders::{impl#3}::field::{closure_env#0}> (builders.rs:162)
==583716==    by 0x14E621: and_then<(), core::fmt::Error, (), core::fmt::builders::{impl#3}::field_with::{closure_env#0}<core::fmt::builders::{impl#3}::field::{closure_env#0}>> (result.rs:1321)
==583716==    by 0x14E621: field_with<core::fmt::builders::{impl#3}::field::{closure_env#0}> (builders.rs:145)
==583716==    by 0x14E621: core::fmt::builders::DebugStruct::field (builders.rs:133)
==583716==    by 0x1121DA: <nix::sys::socket::addr::SockaddrStorage as core::fmt::Debug>::fmt (addr.rs:1369)
==583716==    by 0x111876: <&T as core::fmt::Debug>::fmt (mod.rs:2333)
==583716==    by 0x14E800: {closure#0} (builders.rs:330)
==583716==    by 0x14E800: {closure#0}<core::fmt::builders::{impl#4}::field::{closure_env#0}> (builders.rs:355)
==583716==    by 0x14E800: and_then<(), core::fmt::Error, (), core::fmt::builders::{impl#4}::field_with::{closure_env#0}<core::fmt::builders::{impl#4}::field::{closure_env#0}>> (result.rs:1321)
==583716==    by 0x14E800: field_with<core::fmt::builders::{impl#4}::field::{closure_env#0}> (builders.rs:342)
==583716==    by 0x14E800: core::fmt::builders::DebugTuple::field (builders.rs:330)
==583716==    by 0x14F46A: core::fmt::Formatter::debug_tuple_field1_finish (mod.rs:2095)
==583716==    by 0x1119AD: <core::option::Option<T> as core::fmt::Debug>::fmt (option.rs:567)
==583716==    by 0x14EC3B: fmt (rt.rs:142)
==583716==    by 0x14EC3B: core::fmt::write (mod.rs:1153)
==583716==    by 0x12E10A: write_fmt<std::io::stdio::StdoutLock> (mod.rs:1843)
==583716==    by 0x12E10A: <&std::io::stdio::Stdout as std::io::Write>::write_fmt (stdio.rs:776)
==583716==
==583716== Use of uninitialised value of size 8
==583716==    at 0x1521E0: copy_nonoverlapping<u8> (intrinsics.rs:2987)
==583716==    by 0x1521E0: fmt_u64 (num.rs:245)
==583716==    by 0x1521E0: core::fmt::num::imp::<impl core::fmt::Display for u64>::fmt (num.rs:291)
==583716==    by 0x116569: core::fmt::num::<impl core::fmt::Debug for usize>::fmt (num.rs:195)
==583716==    by 0x14E621: {closure#0} (builders.rs:133)
==583716==    by 0x14E621: {closure#0}<core::fmt::builders::{impl#3}::field::{closure_env#0}> (builders.rs:162)
==583716==    by 0x14E621: and_then<(), core::fmt::Error, (), core::fmt::builders::{impl#3}::field_with::{closure_env#0}<core::fmt::builders::{impl#3}::field::{closure_env#0}>> (result.rs:1321)
==583716==    by 0x14E621: field_with<core::fmt::builders::{impl#3}::field::{closure_env#0}> (builders.rs:145)
==583716==    by 0x14E621: core::fmt::builders::DebugStruct::field (builders.rs:133)
==583716==    by 0x11660E: <libc::unix::linux_like::sockaddr_storage as core::fmt::Debug>::fmt (mod.rs:371)
==583716==    by 0x14E621: {closure#0} (builders.rs:133)
==583716==    by 0x14E621: {closure#0}<core::fmt::builders::{impl#3}::field::{closure_env#0}> (builders.rs:162)
==583716==    by 0x14E621: and_then<(), core::fmt::Error, (), core::fmt::builders::{impl#3}::field_with::{closure_env#0}<core::fmt::builders::{impl#3}::field::{closure_env#0}>> (result.rs:1321)
==583716==    by 0x14E621: field_with<core::fmt::builders::{impl#3}::field::{closure_env#0}> (builders.rs:145)
==583716==    by 0x14E621: core::fmt::builders::DebugStruct::field (builders.rs:133)
==583716==    by 0x1121DA: <nix::sys::socket::addr::SockaddrStorage as core::fmt::Debug>::fmt (addr.rs:1369)
==583716==    by 0x111876: <&T as core::fmt::Debug>::fmt (mod.rs:2333)
==583716==    by 0x14E800: {closure#0} (builders.rs:330)
==583716==    by 0x14E800: {closure#0}<core::fmt::builders::{impl#4}::field::{closure_env#0}> (builders.rs:355)
==583716==    by 0x14E800: and_then<(), core::fmt::Error, (), core::fmt::builders::{impl#4}::field_with::{closure_env#0}<core::fmt::builders::{impl#4}::field::{closure_env#0}>> (result.rs:1321)
==583716==    by 0x14E800: field_with<core::fmt::builders::{impl#4}::field::{closure_env#0}> (builders.rs:342)
==583716==    by 0x14E800: core::fmt::builders::DebugTuple::field (builders.rs:330)
==583716==    by 0x14F46A: core::fmt::Formatter::debug_tuple_field1_finish (mod.rs:2095)
==583716==    by 0x1119AD: <core::option::Option<T> as core::fmt::Debug>::fmt (option.rs:567)
==583716==    by 0x14EC3B: fmt (rt.rs:142)
==583716==    by 0x14EC3B: core::fmt::write (mod.rs:1153)
==583716==    by 0x12E10A: write_fmt<std::io::stdio::StdoutLock> (mod.rs:1843)
==583716==    by 0x12E10A: <&std::io::stdio::Stdout as std::io::Write>::write_fmt (stdio.rs:776)
==583716==
==583716== Use of uninitialised value of size 8
==583716==    at 0x1521EB: copy_nonoverlapping<u8> (intrinsics.rs:2987)
==583716==    by 0x1521EB: fmt_u64 (num.rs:246)
==583716==    by 0x1521EB: core::fmt::num::imp::<impl core::fmt::Display for u64>::fmt (num.rs:291)
==583716==    by 0x116569: core::fmt::num::<impl core::fmt::Debug for usize>::fmt (num.rs:195)
==583716==    by 0x14E621: {closure#0} (builders.rs:133)
==583716==    by 0x14E621: {closure#0}<core::fmt::builders::{impl#3}::field::{closure_env#0}> (builders.rs:162)
==583716==    by 0x14E621: and_then<(), core::fmt::Error, (), core::fmt::builders::{impl#3}::field_with::{closure_env#0}<core::fmt::builders::{impl#3}::field::{closure_env#0}>> (result.rs:1321)
==583716==    by 0x14E621: field_with<core::fmt::builders::{impl#3}::field::{closure_env#0}> (builders.rs:145)
==583716==    by 0x14E621: core::fmt::builders::DebugStruct::field (builders.rs:133)
==583716==    by 0x11660E: <libc::unix::linux_like::sockaddr_storage as core::fmt::Debug>::fmt (mod.rs:371)
==583716==    by 0x14E621: {closure#0} (builders.rs:133)
==583716==    by 0x14E621: {closure#0}<core::fmt::builders::{impl#3}::field::{closure_env#0}> (builders.rs:162)
==583716==    by 0x14E621: and_then<(), core::fmt::Error, (), core::fmt::builders::{impl#3}::field_with::{closure_env#0}<core::fmt::builders::{impl#3}::field::{closure_env#0}>> (result.rs:1321)
==583716==    by 0x14E621: field_with<core::fmt::builders::{impl#3}::field::{closure_env#0}> (builders.rs:145)
==583716==    by 0x14E621: core::fmt::builders::DebugStruct::field (builders.rs:133)
==583716==    by 0x1121DA: <nix::sys::socket::addr::SockaddrStorage as core::fmt::Debug>::fmt (addr.rs:1369)
==583716==    by 0x111876: <&T as core::fmt::Debug>::fmt (mod.rs:2333)
==583716==    by 0x14E800: {closure#0} (builders.rs:330)
==583716==    by 0x14E800: {closure#0}<core::fmt::builders::{impl#4}::field::{closure_env#0}> (builders.rs:355)
==583716==    by 0x14E800: and_then<(), core::fmt::Error, (), core::fmt::builders::{impl#4}::field_with::{closure_env#0}<core::fmt::builders::{impl#4}::field::{closure_env#0}>> (result.rs:1321)
==583716==    by 0x14E800: field_with<core::fmt::builders::{impl#4}::field::{closure_env#0}> (builders.rs:342)
==583716==    by 0x14E800: core::fmt::builders::DebugTuple::field (builders.rs:330)
==583716==    by 0x14F46A: core::fmt::Formatter::debug_tuple_field1_finish (mod.rs:2095)
==583716==    by 0x1119AD: <core::option::Option<T> as core::fmt::Debug>::fmt (option.rs:567)
==583716==    by 0x14EC3B: fmt (rt.rs:142)
==583716==    by 0x14EC3B: core::fmt::write (mod.rs:1153)
==583716==    by 0x12E10A: write_fmt<std::io::stdio::StdoutLock> (mod.rs:1843)
==583716==    by 0x12E10A: <&std::io::stdio::Stdout as std::io::Write>::write_fmt (stdio.rs:776)
==583716==
==583716== Conditional jump or move depends on uninitialised value(s)
==583716==    at 0x152203: fmt_u64 (num.rs:234)
==583716==    by 0x152203: core::fmt::num::imp::<impl core::fmt::Display for u64>::fmt (num.rs:291)
==583716==    by 0x116569: core::fmt::num::<impl core::fmt::Debug for usize>::fmt (num.rs:195)
==583716==    by 0x14E621: {closure#0} (builders.rs:133)
==583716==    by 0x14E621: {closure#0}<core::fmt::builders::{impl#3}::field::{closure_env#0}> (builders.rs:162)
==583716==    by 0x14E621: and_then<(), core::fmt::Error, (), core::fmt::builders::{impl#3}::field_with::{closure_env#0}<core::fmt::builders::{impl#3}::field::{closure_env#0}>> (result.rs:1321)
==583716==    by 0x14E621: field_with<core::fmt::builders::{impl#3}::field::{closure_env#0}> (builders.rs:145)
==583716==    by 0x14E621: core::fmt::builders::DebugStruct::field (builders.rs:133)
==583716==    by 0x11660E: <libc::unix::linux_like::sockaddr_storage as core::fmt::Debug>::fmt (mod.rs:371)
==583716==    by 0x14E621: {closure#0} (builders.rs:133)
==583716==    by 0x14E621: {closure#0}<core::fmt::builders::{impl#3}::field::{closure_env#0}> (builders.rs:162)
==583716==    by 0x14E621: and_then<(), core::fmt::Error, (), core::fmt::builders::{impl#3}::field_with::{closure_env#0}<core::fmt::builders::{impl#3}::field::{closure_env#0}>> (result.rs:1321)
==583716==    by 0x14E621: field_with<core::fmt::builders::{impl#3}::field::{closure_env#0}> (builders.rs:145)
==583716==    by 0x14E621: core::fmt::builders::DebugStruct::field (builders.rs:133)
==583716==    by 0x1121DA: <nix::sys::socket::addr::SockaddrStorage as core::fmt::Debug>::fmt (addr.rs:1369)
==583716==    by 0x111876: <&T as core::fmt::Debug>::fmt (mod.rs:2333)
==583716==    by 0x14E800: {closure#0} (builders.rs:330)
==583716==    by 0x14E800: {closure#0}<core::fmt::builders::{impl#4}::field::{closure_env#0}> (builders.rs:355)
==583716==    by 0x14E800: and_then<(), core::fmt::Error, (), core::fmt::builders::{impl#4}::field_with::{closure_env#0}<core::fmt::builders::{impl#4}::field::{closure_env#0}>> (result.rs:1321)
==583716==    by 0x14E800: field_with<core::fmt::builders::{impl#4}::field::{closure_env#0}> (builders.rs:342)
==583716==    by 0x14E800: core::fmt::builders::DebugTuple::field (builders.rs:330)
==583716==    by 0x14F46A: core::fmt::Formatter::debug_tuple_field1_finish (mod.rs:2095)
==583716==    by 0x1119AD: <core::option::Option<T> as core::fmt::Debug>::fmt (option.rs:567)
==583716==    by 0x14EC3B: fmt (rt.rs:142)
==583716==    by 0x14EC3B: core::fmt::write (mod.rs:1153)
==583716==    by 0x12E10A: write_fmt<std::io::stdio::StdoutLock> (mod.rs:1843)
==583716==    by 0x12E10A: <&std::io::stdio::Stdout as std::io::Write>::write_fmt (stdio.rs:776)
==583716==
==583716== Conditional jump or move depends on uninitialised value(s)
==583716==    at 0x152209: fmt_u64 (num.rs:253)
==583716==    by 0x152209: core::fmt::num::imp::<impl core::fmt::Display for u64>::fmt (num.rs:291)
==583716==    by 0x116569: core::fmt::num::<impl core::fmt::Debug for usize>::fmt (num.rs:195)
==583716==    by 0x14E621: {closure#0} (builders.rs:133)
==583716==    by 0x14E621: {closure#0}<core::fmt::builders::{impl#3}::field::{closure_env#0}> (builders.rs:162)
==583716==    by 0x14E621: and_then<(), core::fmt::Error, (), core::fmt::builders::{impl#3}::field_with::{closure_env#0}<core::fmt::builders::{impl#3}::field::{closure_env#0}>> (result.rs:1321)
==583716==    by 0x14E621: field_with<core::fmt::builders::{impl#3}::field::{closure_env#0}> (builders.rs:145)
==583716==    by 0x14E621: core::fmt::builders::DebugStruct::field (builders.rs:133)
==583716==    by 0x11660E: <libc::unix::linux_like::sockaddr_storage as core::fmt::Debug>::fmt (mod.rs:371)
==583716==    by 0x14E621: {closure#0} (builders.rs:133)
==583716==    by 0x14E621: {closure#0}<core::fmt::builders::{impl#3}::field::{closure_env#0}> (builders.rs:162)
==583716==    by 0x14E621: and_then<(), core::fmt::Error, (), core::fmt::builders::{impl#3}::field_with::{closure_env#0}<core::fmt::builders::{impl#3}::field::{closure_env#0}>> (result.rs:1321)
==583716==    by 0x14E621: field_with<core::fmt::builders::{impl#3}::field::{closure_env#0}> (builders.rs:145)
==583716==    by 0x14E621: core::fmt::builders::DebugStruct::field (builders.rs:133)
==583716==    by 0x1121DA: <nix::sys::socket::addr::SockaddrStorage as core::fmt::Debug>::fmt (addr.rs:1369)
==583716==    by 0x111876: <&T as core::fmt::Debug>::fmt (mod.rs:2333)
==583716==    by 0x14E800: {closure#0} (builders.rs:330)
==583716==    by 0x14E800: {closure#0}<core::fmt::builders::{impl#4}::field::{closure_env#0}> (builders.rs:355)
==583716==    by 0x14E800: and_then<(), core::fmt::Error, (), core::fmt::builders::{impl#4}::field_with::{closure_env#0}<core::fmt::builders::{impl#4}::field::{closure_env#0}>> (result.rs:1321)
==583716==    by 0x14E800: field_with<core::fmt::builders::{impl#4}::field::{closure_env#0}> (builders.rs:342)
==583716==    by 0x14E800: core::fmt::builders::DebugTuple::field (builders.rs:330)
==583716==    by 0x14F46A: core::fmt::Formatter::debug_tuple_field1_finish (mod.rs:2095)
==583716==    by 0x1119AD: <core::option::Option<T> as core::fmt::Debug>::fmt (option.rs:567)
==583716==    by 0x14EC3B: fmt (rt.rs:142)
==583716==    by 0x14EC3B: core::fmt::write (mod.rs:1153)
==583716==    by 0x12E10A: write_fmt<std::io::stdio::StdoutLock> (mod.rs:1843)
==583716==    by 0x12E10A: <&std::io::stdio::Stdout as std::io::Write>::write_fmt (stdio.rs:776)
==583716==
==583716== Conditional jump or move depends on uninitialised value(s)
==583716==    at 0x152238: fmt_u64 (num.rs:261)
==583716==    by 0x152238: core::fmt::num::imp::<impl core::fmt::Display for u64>::fmt (num.rs:291)
==583716==    by 0x116569: core::fmt::num::<impl core::fmt::Debug for usize>::fmt (num.rs:195)
==583716==    by 0x14E621: {closure#0} (builders.rs:133)
==583716==    by 0x14E621: {closure#0}<core::fmt::builders::{impl#3}::field::{closure_env#0}> (builders.rs:162)
==583716==    by 0x14E621: and_then<(), core::fmt::Error, (), core::fmt::builders::{impl#3}::field_with::{closure_env#0}<core::fmt::builders::{impl#3}::field::{closure_env#0}>> (result.rs:1321)
==583716==    by 0x14E621: field_with<core::fmt::builders::{impl#3}::field::{closure_env#0}> (builders.rs:145)
==583716==    by 0x14E621: core::fmt::builders::DebugStruct::field (builders.rs:133)
==583716==    by 0x11660E: <libc::unix::linux_like::sockaddr_storage as core::fmt::Debug>::fmt (mod.rs:371)
==583716==    by 0x14E621: {closure#0} (builders.rs:133)
==583716==    by 0x14E621: {closure#0}<core::fmt::builders::{impl#3}::field::{closure_env#0}> (builders.rs:162)
==583716==    by 0x14E621: and_then<(), core::fmt::Error, (), core::fmt::builders::{impl#3}::field_with::{closure_env#0}<core::fmt::builders::{impl#3}::field::{closure_env#0}>> (result.rs:1321)
==583716==    by 0x14E621: field_with<core::fmt::builders::{impl#3}::field::{closure_env#0}> (builders.rs:145)
==583716==    by 0x14E621: core::fmt::builders::DebugStruct::field (builders.rs:133)
==583716==    by 0x1121DA: <nix::sys::socket::addr::SockaddrStorage as core::fmt::Debug>::fmt (addr.rs:1369)
==583716==    by 0x111876: <&T as core::fmt::Debug>::fmt (mod.rs:2333)
==583716==    by 0x14E800: {closure#0} (builders.rs:330)
==583716==    by 0x14E800: {closure#0}<core::fmt::builders::{impl#4}::field::{closure_env#0}> (builders.rs:355)
==583716==    by 0x14E800: and_then<(), core::fmt::Error, (), core::fmt::builders::{impl#4}::field_with::{closure_env#0}<core::fmt::builders::{impl#4}::field::{closure_env#0}>> (result.rs:1321)
==583716==    by 0x14E800: field_with<core::fmt::builders::{impl#4}::field::{closure_env#0}> (builders.rs:342)
==583716==    by 0x14E800: core::fmt::builders::DebugTuple::field (builders.rs:330)
==583716==    by 0x14F46A: core::fmt::Formatter::debug_tuple_field1_finish (mod.rs:2095)
==583716==    by 0x1119AD: <core::option::Option<T> as core::fmt::Debug>::fmt (option.rs:567)
==583716==    by 0x14EC3B: fmt (rt.rs:142)
==583716==    by 0x14EC3B: core::fmt::write (mod.rs:1153)
==583716==    by 0x12E10A: write_fmt<std::io::stdio::StdoutLock> (mod.rs:1843)
==583716==    by 0x12E10A: <&std::io::stdio::Stdout as std::io::Write>::write_fmt (stdio.rs:776)
==583716==
==583716== Use of uninitialised value of size 8
==583716==    at 0x152250: copy_nonoverlapping<u8> (intrinsics.rs:2987)
==583716==    by 0x152250: fmt_u64 (num.rs:267)
==583716==    by 0x152250: core::fmt::num::imp::<impl core::fmt::Display for u64>::fmt (num.rs:291)
==583716==    by 0x116569: core::fmt::num::<impl core::fmt::Debug for usize>::fmt (num.rs:195)
==583716==    by 0x14E621: {closure#0} (builders.rs:133)
==583716==    by 0x14E621: {closure#0}<core::fmt::builders::{impl#3}::field::{closure_env#0}> (builders.rs:162)
==583716==    by 0x14E621: and_then<(), core::fmt::Error, (), core::fmt::builders::{impl#3}::field_with::{closure_env#0}<core::fmt::builders::{impl#3}::field::{closure_env#0}>> (result.rs:1321)
==583716==    by 0x14E621: field_with<core::fmt::builders::{impl#3}::field::{closure_env#0}> (builders.rs:145)
==583716==    by 0x14E621: core::fmt::builders::DebugStruct::field (builders.rs:133)
==583716==    by 0x11660E: <libc::unix::linux_like::sockaddr_storage as core::fmt::Debug>::fmt (mod.rs:371)
==583716==    by 0x14E621: {closure#0} (builders.rs:133)
==583716==    by 0x14E621: {closure#0}<core::fmt::builders::{impl#3}::field::{closure_env#0}> (builders.rs:162)
==583716==    by 0x14E621: and_then<(), core::fmt::Error, (), core::fmt::builders::{impl#3}::field_with::{closure_env#0}<core::fmt::builders::{impl#3}::field::{closure_env#0}>> (result.rs:1321)
==583716==    by 0x14E621: field_with<core::fmt::builders::{impl#3}::field::{closure_env#0}> (builders.rs:145)
==583716==    by 0x14E621: core::fmt::builders::DebugStruct::field (builders.rs:133)
==583716==    by 0x1121DA: <nix::sys::socket::addr::SockaddrStorage as core::fmt::Debug>::fmt (addr.rs:1369)
==583716==    by 0x111876: <&T as core::fmt::Debug>::fmt (mod.rs:2333)
==583716==    by 0x14E800: {closure#0} (builders.rs:330)
==583716==    by 0x14E800: {closure#0}<core::fmt::builders::{impl#4}::field::{closure_env#0}> (builders.rs:355)
==583716==    by 0x14E800: and_then<(), core::fmt::Error, (), core::fmt::builders::{impl#4}::field_with::{closure_env#0}<core::fmt::builders::{impl#4}::field::{closure_env#0}>> (result.rs:1321)
==583716==    by 0x14E800: field_with<core::fmt::builders::{impl#4}::field::{closure_env#0}> (builders.rs:342)
==583716==    by 0x14E800: core::fmt::builders::DebugTuple::field (builders.rs:330)
==583716==    by 0x14F46A: core::fmt::Formatter::debug_tuple_field1_finish (mod.rs:2095)
==583716==    by 0x1119AD: <core::option::Option<T> as core::fmt::Debug>::fmt (option.rs:567)
==583716==    by 0x14EC3B: fmt (rt.rs:142)
==583716==    by 0x14EC3B: core::fmt::write (mod.rs:1153)
==583716==    by 0x12E10A: write_fmt<std::io::stdio::StdoutLock> (mod.rs:1843)
==583716==    by 0x12E10A: <&std::io::stdio::Stdout as std::io::Write>::write_fmt (stdio.rs:776)
==583716==
Some(SockaddrStorage { ss: sockaddr_storage { ss_family: 17, __ss_align: 432348879942320129 } })
==583716==
==583716== HEAP SUMMARY:
==583716==     in use at exit: 0 bytes in 0 blocks
==583716==   total heap usage: 20 allocs, 20 frees, 22,523 bytes allocated
==583716==
==583716== All heap blocks were freed -- no leaks are possible
==583716==
==583716== Use --track-origins=yes to see where uninitialised values come from
==583716== For lists of detected and suppressed errors, rerun with: -s
==583716== ERROR SUMMARY: 16 errors from 7 contexts (suppressed: 0 from 0)

[quitbug]

I tried to debug the root cause, and it seems to be at line 1908 in this method.

https://github.com/nix-rust/nix/blob/e4895d34d9e92b6d5693a7959bd5ef8bc98b53ba/src/sys/socket/addr.rs#L1895-L1910