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avcodec/adpcm: Check idelta 

Fixes integer overflow
Fixes: signal_sigsegv_1b0a4da_1865_cov_2167818389_computer_anger.avi
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-12-18 16:09:31 +01:00
parent 61296d41e2
commit e59c28b166
1 changed files with 4 additions and 0 deletions
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4
libavcodec/adpcm.c
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@ -246,6 +246,10 @@ static inline short adpcm_ms_expand_nibble(ADPCMChannelStatus *c, int nibble)
c->sample1 = av_clip_int16(predictor);
c->idelta = (ff_adpcm_AdaptationTable[(int)nibble] * c->idelta) >> 8;
if (c->idelta < 16) c->idelta = 16;
if (c->idelta > INT_MAX/768) {
av_log(NULL, AV_LOG_WARNING, "idelta overflow\n");
c->idelta = INT_MAX/768;
}
return c->sample1;
}