GNU bug report logs - #31935
2 crashes in diffutills commit version 576645c

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From: Jim Meyering <jim <at> meyering.net>
To: Hongxu Chen <leftcopy.chx <at> gmail.com>
Cc: 31935 <at> debbugs.gnu.org
Subject: bug#31935: [bug-diffutils] bug#31935: 2 crashes in diffutills commit version 576645c
Date: Fri, 28 Dec 2018 17:13:10 -0800

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On Fri, Jun 22, 2018 at 7:49 AM Hongxu Chen <leftcopy.chx <at> gmail.com> wrote:
>     We found with our fuzzer 2 crashes on diffutils version 576645c: one is a heap-buffer-overflow at util.c:1249, another is an invalid read resulting from `output_1_line' at util.c:1274.
>     The executing command is: `./diff -a --strip-trailing-cr $file add.wasm` where $file is the poc file (I attached them as  *.input.txt); "add.wasm" is also attached however it seems that content of the comparison file is not important.

Thank you for fuzz-testing diffutils.
FYI, here is a reproducer for the limit[-1]-related UMR bugs:

  valgrind src/diff -a --strip-trailing-cr <(printf '\r') <(echo a)

I've attached a patch:

[diffutils-UMR.diff (application/octet-stream, attachment)]

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