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avcodec/exr: Fix overflow with many blocks 

Fixes: signed integer overflow: 1073741827 * 8 cannot be represented in type 'int'
Fixes: 25621/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_EXR_fuzzer-6304841641754624

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 7265b7d904)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-09-26 21:58:37 +02:00
parent 139729ca62
commit 55698d3ef2
1 changed files with 1 additions and 1 deletions
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libavcodec/exr.c
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@ -1771,7 +1771,7 @@ static int decode_frame(AVCodecContext *avctx, void *data,
if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
return ret;
if (bytestream2_get_bytes_left(&s->gb) < nb_blocks * 8)
if (bytestream2_get_bytes_left(&s->gb)/8 < nb_blocks)
return AVERROR_INVALIDDATA;
// check offset table and recreate it if need