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wmalosslessdec: Make arrays WMALL_BLOCK_MAX_SIZE big and check samples_per_frame. 

The samples_per_frame check is ported from wmaprodec.c

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-04-14 13:34:14 +02:00
parent 9166f483c5
commit d442c4462a
1 changed files with 9 additions and 5 deletions
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14
libavcodec/wmalosslessdec.c
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@ -157,14 +157,14 @@ typedef struct WmallDecodeCtx {
int ave_sum[2];
int channel_residues[2][2048];
int channel_residues[2][WMALL_BLOCK_MAX_SIZE];
int lpc_coefs[2][40];
int lpc_order;
int lpc_scaling;
int lpc_intbits;
int channel_coeffs[2][2048];
int channel_coeffs[2][WMALL_BLOCK_MAX_SIZE];
} WmallDecodeCtx;
@ -173,7 +173,7 @@ static av_cold int decode_init(AVCodecContext *avctx)
WmallDecodeCtx *s = avctx->priv_data;
uint8_t *edata_ptr = avctx->extradata;
unsigned int channel_mask;
int i, log2_max_num_subframes, num_possible_block_sizes;
int i, bits, log2_max_num_subframes, num_possible_block_sizes;
s->avctx = avctx;
init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
@ -212,8 +212,12 @@ static av_cold int decode_init(AVCodecContext *avctx)
s->len_prefix = s->decode_flags & 0x40;
/* get frame len */
s->samples_per_frame = 1 << ff_wma_get_frame_len_bits(avctx->sample_rate,
3, s->decode_flags);
bits = ff_wma_get_frame_len_bits(avctx->sample_rate, 3, s->decode_flags);
if (bits > WMALL_BLOCK_MAX_BITS) {
av_log_missing_feature(avctx, "big-bits block sizes", 1);
return AVERROR_INVALIDDATA;
}
s->samples_per_frame = 1 << bits;
/* init previous block len */
for (i = 0; i < avctx->channels; i++)