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avcodec/xpmdec: Check size before allocation to avoid truncation

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Fixes:OOM
Fixes:out of array access (no testcase)
Fixes: 48567/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_XPM_fuzzer-6573323838685184

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 95f0f84dae)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2023-01-12 22:05:07 +01:00
parent a2da41e03a
commit 2ca69aa42d
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1 changed files with 3 additions and 0 deletions
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libavcodec/xpmdec.c
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@ -351,6 +351,9 @@ static int xpm_decode_frame(AVCodecContext *avctx, void *data,
return AVERROR_INVALIDDATA;
}
if (size > SIZE_MAX / 4)
return AVERROR(ENOMEM);
size *= 4;
ptr += mod_strcspn(ptr, ",") + 1;