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avcodec/wmaprodec: Check block_align 

Fixes undefined behavior
Its not known if this condition can be triggered through crafted input.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-07-09 14:01:13 +02:00
parent 694550f18e
commit 7d9cb12689
1 changed files with 4 additions and 0 deletions
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4
libavcodec/wmaprodec.c
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@ -306,6 +306,10 @@ static av_cold int decode_init(AVCodecContext *avctx)
/** generic init */
s->log2_frame_size = av_log2(avctx->block_align) + 4;
if (s->log2_frame_size > 25) {
avpriv_request_sample(avctx, "Large block align");
return AVERROR_PATCHWELCOME;
}
/** frame info */
s->skip_frame = 1; /* skip first frame */