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avcodec/exr: Check ac_count

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Fixes: signed integer overflow: -9223372036854775808 * 2 cannot be represented in type 'long long'
Fixes: 36244/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_EXR_fuzzer-6090656186499072

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 9bc32d7c4bed836086199ce55cf4a5ddd5217f3e)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-08-01 18:38:31 +02:00
parent 8a3eb4498b
commit fbf576417a
1 changed files with 3 additions and 1 deletions
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4
libavcodec/exr.c
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@ -1014,7 +1014,9 @@ static int dwa_uncompress(EXRContext *s, const uint8_t *src, int compressed_size
dc_count = AV_RL64(src + 72);
ac_compression = AV_RL64(src + 80);
if (compressed_size < (uint64_t)(lo_size | ac_size | dc_size | rle_csize) || compressed_size < 88LL + lo_size + ac_size + dc_size + rle_csize)
if ( compressed_size < (uint64_t)(lo_size | ac_size | dc_size | rle_csize) || compressed_size < 88LL + lo_size + ac_size + dc_size + rle_csize
|| ac_count > (uint64_t)INT_MAX/2
)
return AVERROR_INVALIDDATA;
bytestream2_init(&gb, src + 88, compressed_size - 88);