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Status: New
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Type: Bug-Security



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Issue 12803: libpng-proto/png_transforms_fuzzer: Stack-use-after-return in OSS_FUZZ_png_safe_execute

Reported by ClusterFuzz-External, Feb 1 Project Member

Issue description

Detailed report: https://oss-fuzz.com/testcase?key=5756860290826240

Project: libpng-proto
Fuzzer: libFuzzer_libpng-proto_png_transforms_fuzzer
Fuzz target binary: png_transforms_fuzzer
Job Type: libfuzzer_asan_libpng-proto
Platform Id: linux

Crash Type: Stack-use-after-return WRITE 8
Crash Address: 0x7f8ce2b83230
Crash State:
  OSS_FUZZ_png_safe_execute
  OSS_FUZZ_png_image_free
  OSS_FUZZ_png_safe_execute
  
Sanitizer: address (ASAN)

Regressed: https://oss-fuzz.com/revisions?job=libfuzzer_asan_libpng-proto&range=201901300220:201902010219

Reproducer Testcase: https://oss-fuzz.com/download?testcase_id=5756860290826240

Issue filed automatically.

See https://github.com/google/oss-fuzz/blob/master/docs/reproducing.md for instructions to reproduce this bug locally.

This bug is subject to a 90 day disclosure deadline. If 90 days elapse
without an upstream patch, then the bug report will automatically
become visible to the public.

When you fix this bug, please
  * mention the fix revision(s).
  * state whether the bug was a short-lived regression or an old bug in any stable releases.
  * add any other useful information.
This information can help downstream consumers.

If you need to contact the OSS-Fuzz team with a question, concern, or any other feedback, please file an issue at https://github.com/google/oss-fuzz/issues.
 

Comment 1 by ClusterFuzz-External, Feb 1

Project Member
Labels: OS-Linux

Comment 2 by ClusterFuzz-External, Feb 1

Project Member
Labels: Fuzz-Blocker
This crash occurs very frequently on linux platform and is likely preventing the fuzzer png_transforms_fuzzer from making much progress. Fixing this will allow more bugs to be found.

If this is incorrect, please file a bug on https://github.com/google/oss-fuzz/issues/new

Comment 3 by kcc@google.com, Feb 1

Project Member
Labels: -Restrict-View-Commit
reported as https://github.com/glennrp/libpng/issues/275#issuecomment-459825329
de-restricting

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