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avcodec/sonic: Check e in get_symbol() 

Fixes: signed integer overflow: 1721520852 + 1721520852 cannot be represented in type 'int'
Fixes: 18346/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SONIC_fuzzer-5709623893426176
Fixes: 18753/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SONIC_fuzzer-5663299131932672

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-10-21 23:22:05 +02:00
parent 4dc93ae3d7
commit aea6755611
1 changed files with 2 additions and 0 deletions
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libavcodec/sonic.c
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@ -144,6 +144,8 @@ static inline av_flatten int get_symbol(RangeCoder *c, uint8_t *state, int is_si
e= 0;
while(get_rac(c, state+1 + FFMIN(e,9))){ //1..10
e++;
if (e > 31)
return AVERROR_INVALIDDATA;
}
a= 1;