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Message-Id: <20240727224040.2248-1-hdanton@sina.com>
Date: Sun, 28 Jul 2024 06:40:40 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+c1751b6739d83d70bb75@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [ntfs3?] possible deadlock in ntfs_file_mmap
On Sat, 27 Jul 2024 06:44:20 -0700
> syzbot has found a reproducer for the following issue on:
>
> HEAD commit: 2f8c4f506285 Merge tag 'auxdisplay-for-v6.11-tag1' of git:..
> git tree: upstream
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12e875a1980000
#syz test upstream 2f8c4f506285
--- x/fs/ntfs3/file.c
+++ y/fs/ntfs3/file.c
@@ -365,7 +365,10 @@ static int ntfs_file_mmap(struct file *f
}
if (ni->i_valid < to) {
- inode_lock(inode);
+ if (!inode_trylock(inode)) {
+ err = -EDEADLK;
+ goto out;
+ }
err = ntfs_extend_initialized_size(file, ni,
ni->i_valid, to);
inode_unlock(inode);
--
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