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Date: Sun, 16 Jun 2024 14:32:56 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+5d34cc6474499a5ff516@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [ntfs3?] KASAN: slab-use-after-free Read in chrdev_open
#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 83a7eefedc9b
--- x/fs/open.c
+++ y/fs/open.c
@@ -952,6 +952,12 @@ static int do_dentry_open(struct file *f
if (!open)
open = f->f_op->open;
if (open) {
+ struct mount *mnt = real_mount(f->f_path.mnt);
+ error = -ENODEV;
+ if (mnt->mnt.mnt_flags & MNT_DOOMED)
+ goto cleanup_all;
+ if (mnt_get_count(mnt) < 2)
+ goto cleanup_all;
error = open(inode, f);
if (error)
goto cleanup_all;
--
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