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wmadec: check nb_frames 

Improves error message for Ticket968

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-03-03 16:50:47 +01:00
parent 3fac99cd9d
commit 6c6dc8ccea
1 changed files with 4 additions and 0 deletions
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4
libavcodec/wmadec.c
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@ -827,6 +827,10 @@ static int wma_decode_superframe(AVCodecContext *avctx, void *data,
/* read super frame header */
skip_bits(&s->gb, 4); /* super frame index */
nb_frames = get_bits(&s->gb, 4) - (s->last_superframe_len <= 0);
if (nb_frames <= 0) {
av_log(avctx, AV_LOG_ERROR, "nb_frames is %d\n", nb_frames);
return AVERROR_INVALIDDATA;
}
} else {
nb_frames = 1;
}