Patch "FS: JFS: Fix null-ptr-deref Read in txBegin" has been added to the 4.14-stable tree

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This is a note to let you know that I've just added the patch titled

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

to the 4.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     fs-jfs-fix-null-ptr-deref-read-in-txbegin.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit d26a25629f17d651ab37052d754e2c24adfa9522
Author: Immad Mir <mirimmad17@xxxxxxxxx>
Date:   Fri Jun 23 19:14:01 2023 +0530

    FS: JFS: Fix null-ptr-deref Read in txBegin
    
    [ 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@xxxxxxxxxxxxxxxxxxxxxxxxx
    Link: https://syzkaller.appspot.com/bug?id=be7e52c50c5182cc09a09ea6fc456446b2039de3
    
    Signed-off-by: Immad Mir <mirimmad17@xxxxxxxxx>
    Signed-off-by: Dave Kleikamp <dave.kleikamp@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/fs/jfs/namei.c b/fs/jfs/namei.c
index 56c3fcbfe80ed..6726dcddd6f86 100644
--- a/fs/jfs/namei.c
+++ b/fs/jfs/namei.c
@@ -813,6 +813,11 @@ 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);



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