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avformat/oggparsedaala: Do not leave an invalid value in gpshift 

Fixes: undefined behavior
Fixes: 702974

Found-by: Thomas Guilbert <tguilbert@google.com>
Reviewed-by: Rostislav Pehlivanov <atomnuker@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-04-01 19:18:35 +02:00
parent 679a315424
commit 23ae3cc822
1 changed files with 1 additions and 0 deletions
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libavformat/oggparsedaala.c
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@ -126,6 +126,7 @@ static int daala_header(AVFormatContext *s, int idx)
if (hdr->gpshift >= 32) {
av_log(s, AV_LOG_ERROR, "Too large gpshift %d (>= 32).\n",
hdr->gpshift);
hdr->gpshift = 0;
return AVERROR_INVALIDDATA;
}
hdr->gpmask = (1U << hdr->gpshift) - 1;