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avcodec/flacdec: reduce limit for golomb so that the max value does not overflow 

Fixes: runtime error: left shift of 32 by 26 places cannot be represented in type 'int'

Fixes: 628/clusterfuzz-testcase-6187747641393152
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-02-20 23:59:26 +01:00
parent e04108dfa6
commit 0a65dae9d0
1 changed files with 2 additions and 1 deletions
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libavcodec/flacdec.c
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@ -258,8 +258,9 @@ static int decode_residuals(FLACContext *s, int32_t *decoded, int pred_order)
for (; i < samples; i++)
*decoded++ = get_sbits_long(&s->gb, tmp);
} else {
int real_limit = tmp ? (INT_MAX >> tmp) + 2 : INT_MAX;
for (; i < samples; i++) {
int v = get_sr_golomb_flac(&s->gb, tmp, INT_MAX, 0);
int v = get_sr_golomb_flac(&s->gb, tmp, real_limit, 0);
if (v == 0x80000000){
av_log(s->avctx, AV_LOG_ERROR, "invalid residual\n");
return AVERROR_INVALIDDATA;