FS: JFS: Fix null-ptr-deref Read in txBegin

 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@syzkaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?id=be7e52c50c5182cc09a09ea6fc456446b2039de3
Signed-off-by: Immad Mir <mirimmad17@gmail.com>
Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>

diff --git a/fs/jfs/namei.c b/fs/jfs/namei.c
index b29d68b5eec53039b91152824c9dacdc8e70e4ad..f370c76051205927e72ee3a10c0bd860b8811408 100644 (file)
--- 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);