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alsdec: check block length
Fix writing over the end Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind Addresses: CVE-2013-0845
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@@ -1376,6 +1376,11 @@ static int read_frame_data(ALSDecContext *ctx, unsigned int ra_frame)
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for (b = 0; b < ctx->num_blocks; b++) {
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bd.block_length = div_blocks[b];
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if (bd.block_length <= 0) {
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av_log(ctx->avctx, AV_LOG_WARNING,
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"Invalid block length %d in channel data!\n", bd.block_length);
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continue;
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}
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for (c = 0; c < avctx->channels; c++) {
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bd.const_block = ctx->const_block + c;
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