From 954d55c2a4244b366ae97d09546ba8ce2534892b Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Wed, 11 Dec 2024 23:26:02 +0100 Subject: [PATCH] avformat/mov: dereference pointer after null check Fixes: null pointer dereference Fixes: 383397479/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-4776829338058752 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer --- libavformat/mov.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/libavformat/mov.c b/libavformat/mov.c index d6aeae048f..2f79aa3727 100644 --- a/libavformat/mov.c +++ b/libavformat/mov.c @@ -10296,10 +10296,11 @@ static int mov_parse_tiles(AVFormatContext *s) for (k = 0; k < mov->nb_heif_item; k++) { HEIFItem *item = mov->heif_item[k]; - AVStream *st = item->st; + AVStream *st; if (!item || item->item_id != tile_id) continue; + st = item->st; if (!st) { av_log(s, AV_LOG_WARNING, "HEIF item id %d from grid id %d doesn't " "reference a stream\n",