linux-kernel - Re: [syzbot] [jffs2?] [nilfs?] KASAN: slab-use-after-free Read in jffs2_garbage_collect

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Date: Mon, 22 Apr 2024 14:29:11 +0900
From: Jeongjun Park <aha310510@...il.com>
To: syzbot+e84662c5f30b8c401437@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [jffs2?] [nilfs?] KASAN: slab-use-after-free Read in jffs2_garbage_collect_pass

please test slab-use-after-free Read in jffs2_garbage_collect_pass

#syz test git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

---
 fs/jffs2/super.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/jffs2/super.c b/fs/jffs2/super.c
index aede1be4dc0c..49bf8e11c11c 100644
--- a/fs/jffs2/super.c
+++ b/fs/jffs2/super.c
@@ -348,6 +348,7 @@ static void jffs2_kill_sb(struct super_block *sb)
 		jffs2_stop_garbage_collect_thread(c);
 	kill_mtd_super(sb);
 	kfree(c);
+	memset(&c, 0, sizeof(struct jffs2_sb_info));
 }
 
 static struct file_system_type jffs2_fs_type = {
-- 
2.34.1