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4xm: check for invalid zero ac coeffs 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-06-30 01:28:25 +02:00
parent 6d6eabd399
commit 13c56e9a9c
1 changed files with 6 additions and 1 deletions
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7
libavcodec/4xm.c
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@ -525,7 +525,12 @@ static int decode_i_block(FourXContext *f, int16_t *block)
if (code == 0xf0) {
i += 16;
} else {
level = get_xbits(&f->gb, code & 0xf);
if (code & 0xf) {
level = get_xbits(&f->gb, code & 0xf);
} else {
av_log(f->avctx, AV_LOG_ERROR, "0 coeff\n");
return AVERROR_INVALIDDATA;
}
i += code >> 4;
if (i >= 64) {
av_log(f->avctx, AV_LOG_ERROR, "run %d oveflow\n", i);