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wmapro: check num_vec_coeffs against the actual available buffer

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Prevent yet another buffer overwrite.

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
This commit is contained in:
Luca Barbato 2013-06-28 05:23:21 +02:00
parent 6652338f43
commit 3822936252
1 changed files with 4 additions and 3 deletions
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7
libavcodec/wmaprodec.c
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@ -1119,11 +1119,12 @@ static int decode_subframe(WMAProDecodeCtx *s)
cur_subwoofer_cutoff = s->subwoofer_cutoffs[s->table_idx];
/** configure the decoder for the current subframe */
offset += s->samples_per_frame >> 1;
for (i = 0; i < s->channels_for_cur_subframe; i++) {
int c = s->channel_indexes_for_cur_subframe[i];
s->channel[c].coeffs = &s->channel[c].out[(s->samples_per_frame >> 1)
+ offset];
s->channel[c].coeffs = &s->channel[c].out[offset];
}
s->subframe_len = subframe_len;
@ -1174,7 +1175,7 @@ static int decode_subframe(WMAProDecodeCtx *s)
for (i = 0; i < s->channels_for_cur_subframe; i++) {
int c = s->channel_indexes_for_cur_subframe[i];
int num_vec_coeffs = get_bits(&s->gb, num_bits) << 2;
if (num_vec_coeffs > WMAPRO_BLOCK_MAX_SIZE) {
if (num_vec_coeffs + offset > FF_ARRAY_ELEMS(s->channel[c].out)) {
av_log(s->avctx, AV_LOG_ERROR, "num_vec_coeffs %d is too large\n", num_vec_coeffs);
return AVERROR_INVALIDDATA;
}