[FFmpeg-devel] [PATCH] avcodec/utvideodec: Clear plane_start array (PR #20247)

[michaelni]

PR #20247 opened by michaelni
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20247
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/20247.patch

in pack mode the array is passed into decode_plane() without being initialized or used

Fixes: use of uninitialized memory
Fixes: 438780119/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_UTVIDEO_DEC_fuzzer-5464037027807232

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>


From 2a22972db3b390d82dedbdbb5f44cc09a43912b5 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael at niedermayer.cc>
Date: Fri, 15 Aug 2025 17:55:05 +0200
Subject: [PATCH] avcodec/utvideodec: Clear plane_start array

in pack mode the array is passed into decode_plane() without being initialized or used

Fixes: use of uninitialized memory
Fixes: 438780119/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_UTVIDEO_DEC_fuzzer-5464037027807232

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
 libavcodec/utvideodec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/utvideodec.c b/libavcodec/utvideodec.c
index 934945c1be..bc02ac44d5 100644
--- a/libavcodec/utvideodec.c
+++ b/libavcodec/utvideodec.c
@@ -585,7 +585,7 @@ static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
     int buf_size = avpkt->size;
     UtvideoContext *c = avctx->priv_data;
     int i, j;
-    const uint8_t *plane_start[5];
+    const uint8_t *plane_start[5] = {NULL};
     int plane_size, max_slice_size = 0, slice_start, slice_end, slice_size;
     int ret;
     GetByteContext gb;
-- 
2.49.1