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escape124: reject codebook size 0 

It causes a cb_depth of 32, leading to assertion failures in get_bits.

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
This commit is contained in:
Andreas Cadhalpun 2016-11-09 00:38:50 +01:00
parent d54c95a143
commit 226d35c845
1 changed files with 4 additions and 0 deletions
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4
libavcodec/escape124.c
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@ -249,6 +249,10 @@ static int escape124_decode_frame(AVCodecContext *avctx,
// This codebook can be cut off at places other than
// powers of 2, leaving some of the entries undefined.
cb_size = get_bits_long(&gb, 20);
if (!cb_size) {
av_log(avctx, AV_LOG_ERROR, "Invalid codebook size 0.\n");
return AVERROR_INVALIDDATA;
}
cb_depth = av_log2(cb_size - 1) + 1;
} else {
cb_depth = get_bits(&gb, 4);