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avcodec/wmalosslessdec: check block_align

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Code copied from wmaprodec

Fixes null pointer dereference
Fixes Ticket3002

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-10-02 01:16:11 +02:00
parent ad8fbddb94
commit 286beebdc3
1 changed files with 5 additions and 0 deletions
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5
libavcodec/wmalosslessdec.c
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@ -178,6 +178,11 @@ static av_cold int decode_init(AVCodecContext *avctx)
unsigned int channel_mask;
int i, log2_max_num_subframes;
if (!avctx->block_align) {
av_log(avctx, AV_LOG_ERROR, "block_align is not set\n");
return AVERROR(EINVAL);
}
s->avctx = avctx;
init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);