From 369fbc9cb5ee2b61882d34984b4485200bde20b1 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Thu, 24 Jul 2025 01:05:40 +0200 Subject: [PATCH] avformat/mxg: clear AV_INPUT_BUFFER_PADDING_SIZE Fixes: use of uninitialized memory Fixes: 427532813/clusterfuzz-testcase-minimized-ffmpeg_dem_MXG_fuzzer-5661938917113856 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer (cherry picked from commit 1b12e919cfe3bf69038225794330d14575fb78d0) Signed-off-by: Michael Niedermayer --- libavformat/mxg.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/libavformat/mxg.c b/libavformat/mxg.c index b160ccb9f9..1f649aafc5 100644 --- a/libavformat/mxg.c +++ b/libavformat/mxg.c @@ -125,6 +125,8 @@ static int mxg_update_cache(AVFormatContext *s, unsigned int cache_size) mxg->cache_size += ret; + memset(mxg->buffer_ptr + mxg->cache_size, 0, AV_INPUT_BUFFER_PADDING_SIZE); + return ret; }