linux-kernel - Re: [syzbot] [reiserfs?] possible deadlock in chmod

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Message-ID: <0000000000006a3904060d1082e7@google.com>
Date: Thu, 21 Dec 2023 19:06:58 -0800
From: syzbot <syzbot+83693dbba860b4f2e549@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org
Subject: Re: [syzbot] [reiserfs?] possible deadlock in chmod_common (2)

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Subject: [reiserfs?] possible deadlock in chmod_common (2)
Author: lizhi.xu@...driver.com

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git aafe7ad77b91

diff --git a/fs/reiserfs/ioctl.c b/fs/reiserfs/ioctl.c
index dd33f8cc6eda..cf219a998a89 100644
--- a/fs/reiserfs/ioctl.c
+++ b/fs/reiserfs/ioctl.c
@@ -100,7 +100,9 @@ long reiserfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 			err = -EPERM;
 			break;
 		}
+		reiserfs_write_unlock(inode->i_sb);
 		err = mnt_want_write_file(filp);
+		reiserfs_write_lock(inode->i_sb);
 		if (err)
 			break;
 		if (get_user(inode->i_generation, (int __user *)arg)) {