Fix writing over the end
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Addresses: CVE-2013-0845
---
libavcodec/alsdec.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/libavcodec/alsdec.c b/libavcodec/alsdec.c
index 782a1b8..f7dee7d 100644
--- a/libavcodec/alsdec.c
+++ b/libavcodec/alsdec.c
@@ -1376,6 +1376,11 @@ static int read_frame_data(ALSDecContext *ctx, unsigned
int ra_frame)
for (b = 0; b < ctx->num_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++) {
bd.const_block = ctx->const_block + c;
--
1.8.1.2
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