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avcodec/magicyuv: Check slice size before reading flags and pred 

Fixes: heap-buffer-overflow
Fixes: 26487/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MAGICYUV_fuzzer-5742553675333632

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 0dc42147b6)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-10-23 20:39:33 +02:00
parent fee0e0ddbf
commit 5e880774dc
1 changed files with 3 additions and 0 deletions
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3
libavcodec/magicyuv.c
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@ -695,6 +695,9 @@ static int magy_decode_frame(AVCodecContext *avctx, void *data,
s->slices[i][j].start = offset + header_size;
s->slices[i][j].size = avpkt->size - s->slices[i][j].start;
if (s->slices[i][j].size < 2)
return AVERROR_INVALIDDATA;
}
if (bytestream2_get_byte(&gbyte) != s->planes)