[FFmpeg-devel] [PATCH 1/5] avcodec/atrac9dec: Clamp band_ext_data to max that can be read if skipped.

Lynne dev at lynne.ee
Thu Dec 26 18:24:31 EET 2019

Dec 26, 2019, 13:57 by dev at lynne.ee:

> Dec 16, 2019, 23:19 by michael at niedermayer.cc:
>> Fixes: out of array read
>> Fixes: 19327/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ATRAC9_fuzzer-5679823087468544
>> Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
>> Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>>

Actually nevermind, patch is good as-is. I think a 0 len just means to reuse the parameters from the previous. So clipping them should be fine.
You should replace the FFMIN(val, (len << 1) - 1) with a av_clip_uintp2(val, len) which does exactly that.

More information about the ffmpeg-devel mailing list