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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
This commit is contained in:
Reinhard Tartler 2013-12-08 13:24:26 -05:00
parent 1a5fdf9519
commit 2a0fb7286d
1 changed files with 5 additions and 0 deletions
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5
libavcodec/alsdec.c
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@ -1376,6 +1376,11 @@ static int read_frame_data(ALSDecContext *ctx, unsigned int ra_frame)
for (b = 0; b < ctx->num_blocks; b++) { for (b = 0; b < ctx->num_blocks; b++) {
bd.block_length = div_blocks[b]; bd.block_length = div_blocks[b];
if (bd.block_length <= 0) {
av_log(ctx->avctx, AV_LOG_WARNING,
"Invalid block length %d in channel data!\n", bd.block_length);
continue;
}
for (c = 0; c < avctx->channels; c++) { for (c = 0; c < avctx->channels; c++) {
bd.const_block = ctx->const_block + c; bd.const_block = ctx->const_block + c;