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wav: Add check for 'fmt' tag in SMV code 

If there is a 'SMV0' tag, but no 'fmt' tag, it is possible that
'st' got used as NULL.

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
This commit is contained in:
Derek Buitenhuis 2012-07-16 14:17:52 -04:00
parent 4f4eb380f0
commit 5ab855777d
1 changed files with 4 additions and 0 deletions
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4
libavformat/wav.c
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@ -480,6 +480,10 @@ static int wav_read_header(AVFormatContext *s)
return ret;
break;
case MKTAG('S','M','V','0'):
if (!got_fmt) {
av_log(s, AV_LOG_ERROR, "found no 'fmt ' tag before the 'SMV0' tag\n");
return AVERROR_INVALIDDATA;
}
// SMV file, a wav file with video appended.
if (size != MKTAG('0','2','0','0')) {
av_log(s, AV_LOG_ERROR, "Unknown SMV version found\n");