[FFmpeg-cvslog] alsdec: check block length
Thilo Borgmann
thilo.borgmann at mail.de
Fri Jan 17 10:18:24 CET 2014
Am 16.01.14 21:43, schrieb Reinhard Tartler:
> ffmpeg | branch: release/0.10 | Reinhard Tartler <siretart at tauware.de> | Sun Dec 8 13:24:26 2013 -0500| [d4a24e43edd0c1a06d5dbf454448fde5b3d1d281] | committer: Reinhard Tartler
>
> alsdec: check block length
>
> Fix writing over the end
>
> Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
> Addresses: CVE-2013-0845
> (cherry picked from commit 2a0fb7286d67c47e44aa76c237ede117b22af616)
>
> Signed-off-by: Reinhard Tartler <siretart at tauware.de>
> (cherry picked from commit 3f7d89034bfe50893927cc92ddcb95a2e9b4178d)
> Signed-off-by: Reinhard Tartler <siretart at tauware.de>
>
>> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=d4a24e43edd0c1a06d5dbf454448fde5b3d1d281
> ---
>
> libavcodec/alsdec.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/libavcodec/alsdec.c b/libavcodec/alsdec.c
> index b0369d7..7daa545 100644
> --- a/libavcodec/alsdec.c
> +++ b/libavcodec/alsdec.c
> @@ -1386,6 +1386,11 @@ 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;
> + }
Have you tested this? Does FATE complain?
IIRC a block length == 0 is valid for example in the last frame.
-Thilo
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