[FFmpeg-cvslog] avformat/wtvdec: Initialize buf

[Michael Niedermayer]

ffmpeg | branch: release/7.1 | Michael Niedermayer <michael at niedermayer.cc> | Thu Dec 26 02:53:45 2024 +0100| [1646840988ed12aefc35ef283bb44f91df277ad9] | 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>
(cherry picked from commit 17b019c517af26c6d2f0c6266938c60d36db1fa3)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=1646840988ed12aefc35ef283bb44f91df277ad9
---

 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;
                 int buf_size;