[FFmpeg-cvslog] avformat/jpegxl_anim_dec: clear buffer padding

[Michael Niedermayer]

ffmpeg | branch: release/7.1 | Michael Niedermayer <michael at niedermayer.cc> | Fri Aug 16 16:33:43 2024 +0200| [d322ffdef526a2913423a0ba69fb729c7f54837f] | committer: Michael Niedermayer

avformat/jpegxl_anim_dec: clear buffer padding

Fixes: use of uninitialized value
Fixes: 70992/clusterfuzz-testcase-minimized-ffmpeg_dem_IMAGE2_fuzzer-5735819170611200

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 3f0b95bb176445a509d99e7497e90f20355b8411)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=d322ffdef526a2913423a0ba69fb729c7f54837f
---

 libavformat/jpegxl_anim_dec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/jpegxl_anim_dec.c b/libavformat/jpegxl_anim_dec.c
index 2338a2e8c0..7798f3dabc 100644
--- a/libavformat/jpegxl_anim_dec.c
+++ b/libavformat/jpegxl_anim_dec.c
@@ -43,7 +43,7 @@ typedef struct JXLAnimDemuxContext {
 
 static int jpegxl_anim_probe(const AVProbeData *p)
 {
-    uint8_t buffer[4096 + AV_INPUT_BUFFER_PADDING_SIZE];
+    uint8_t buffer[4096 + AV_INPUT_BUFFER_PADDING_SIZE] = {0};
     int copied = 0, ret;
     FFJXLMetadata meta = { 0 };