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wmadec: prevent null pointer call. 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-04-25 16:16:44 +02:00
parent 1da254b849
commit 7157334c37
1 changed files with 5 additions and 0 deletions
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5
libavcodec/wmadec.c
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@ -489,6 +489,11 @@ static int wma_decode_block(WMACodecContext *s)
s->block_len_bits = s->frame_len_bits;
}
if (s->frame_len_bits - s->block_len_bits >= s->nb_block_sizes){
av_log(s->avctx, AV_LOG_ERROR, "block_len_bits not initialized to a valid value\n");
return -1;
}
/* now check if the block length is coherent with the frame length */
s->block_len = 1 << s->block_len_bits;
if ((s->block_pos + s->block_len) > s->frame_len){