[FFmpeg-devel] [FFmpeg-cvslog] avformat/wtvdec: Initialize buf
Peter Ross
pross at xvid.org
Wed Jan 22 10:02:07 EET 2025
On Tue, Jan 21, 2025 at 09:57:43PM +0000, Michael Niedermayer wrote:
> ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Thu Dec 26 02:53:45 2024 +0100| [17b019c517af26c6d2f0c6266938c60d36db1fa3] | committer: Michael Niedermayer
>
> avformat/wtvdec: Initialize buf
>
> ff_parse_mpeg2_descriptor() reads over what is initialized
> Fixes: use of uninitialized memory
> Fixes: 383825645/clusterfuzz-testcase-minimized-ffmpeg_dem_WTV_fuzzer-5144130618982400
>
> Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
>
> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=17b019c517af26c6d2f0c6266938c60d36db1fa3
> ---
>
> libavformat/wtvdec.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/libavformat/wtvdec.c b/libavformat/wtvdec.c
> index 730c7fca78..21c9649869 100644
> --- a/libavformat/wtvdec.c
> +++ b/libavformat/wtvdec.c
> @@ -833,7 +833,7 @@ static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_p
> int stream_index = ff_find_stream_index(s, sid);
> if (stream_index >= 0) {
> AVStream *st = s->streams[stream_index];
> - uint8_t buf[258];
> + uint8_t buf[258] = {0};
> const uint8_t *pbuf = buf;
hi michael,
can you help me understand why this is needed...
the avio_read() call fills buf, and the call to ff_parse_mpeg2_descriptor
specifies an "end" pointer (desc_list_end point) to prevent overreading.
where is the uninitialised memory coming from?
-- Peter
(A907 E02F A6E5 0CD2 34CD 20D2 6760 79C5 AC40 DD6B)
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 195 bytes
Desc: not available
URL: <https://ffmpeg.org/pipermail/ffmpeg-devel/attachments/20250122/6f620601/attachment.sig>
More information about the ffmpeg-devel
mailing list