linux-kernel - [PATCH AUTOSEL 5.15 22/23] FS: JFS: Fix null-ptr-deref Read in txBegin

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Message-Id: <20230724012334.2317140-22-sashal@kernel.org>
Date:   Sun, 23 Jul 2023 21:23:33 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Immad Mir <mirimmad17@...il.com>,
        syzbot+f1faa20eec55e0c8644c@...kaller.appspotmail.com,
        Dave Kleikamp <dave.kleikamp@...cle.com>,
        Sasha Levin <sashal@...nel.org>, shaggy@...nel.org,
        jfs-discussion@...ts.sourceforge.net
Subject: [PATCH AUTOSEL 5.15 22/23] FS: JFS: Fix null-ptr-deref Read in txBegin

From: Immad Mir <mirimmad17@...il.com>

[ Upstream commit 47cfdc338d674d38f4b2f22b7612cc6a2763ba27 ]

 Syzkaller reported an issue where txBegin may be called
 on a superblock in a read-only mounted filesystem which leads
 to NULL pointer deref. This could be solved by checking if
 the filesystem is read-only before calling txBegin, and returning
 with appropiate error code.

Reported-By: syzbot+f1faa20eec55e0c8644c@...kaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?id=be7e52c50c5182cc09a09ea6fc456446b2039de3

Signed-off-by: Immad Mir <mirimmad17@...il.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/jfs/namei.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/jfs/namei.c b/fs/jfs/namei.c
index 4fbbf88435e69..b3a0fe0649c49 100644
--- a/fs/jfs/namei.c
+++ b/fs/jfs/namei.c
@@ -799,6 +799,11 @@ static int jfs_link(struct dentry *old_dentry,
 	if (rc)
 		goto out;
 
+	if (isReadOnly(ip)) {
+		jfs_error(ip->i_sb, "read-only filesystem\n");
+		return -EROFS;
+	}
+
 	tid = txBegin(ip->i_sb, 0);
 
 	mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
-- 
2.39.2