Patch "jfs: fix uaf in jfs_evict_inode" has been added to the 6.6-stable tree

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

    jfs: fix uaf in jfs_evict_inode

to the 6.6-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:
     jfs-fix-uaf-in-jfs_evict_inode.patch
and it can be found in the queue-6.6 subdirectory.

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



commit 3c055ab2d92a1c8fa20ba7648b2d481bc2a19fd7
Author: Edward Adam Davis <eadavis@xxxxxx>
Date:   Tue Oct 31 13:39:04 2023 +0800

    jfs: fix uaf in jfs_evict_inode
    
    [ Upstream commit e0e1958f4c365e380b17ccb35617345b31ef7bf3 ]
    
    When the execution of diMount(ipimap) fails, the object ipimap that has been
    released may be accessed in diFreeSpecial(). Asynchronous ipimap release occurs
    when rcu_core() calls jfs_free_node().
    
    Therefore, when diMount(ipimap) fails, sbi->ipimap should not be initialized as
    ipimap.
    
    Reported-and-tested-by: syzbot+01cf2dbcbe2022454388@xxxxxxxxxxxxxxxxxxxxxxxxx
    Signed-off-by: Edward Adam Davis <eadavis@xxxxxx>
    Signed-off-by: Dave Kleikamp <dave.kleikamp@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/fs/jfs/jfs_mount.c b/fs/jfs/jfs_mount.c
index b83aae56a1f2..631b8bd3e438 100644
--- a/fs/jfs/jfs_mount.c
+++ b/fs/jfs/jfs_mount.c
@@ -172,15 +172,15 @@ int jfs_mount(struct super_block *sb)
 	}
 	jfs_info("jfs_mount: ipimap:0x%p", ipimap);
 
-	/* map further access of per fileset inodes by the fileset inode */
-	sbi->ipimap = ipimap;
-
 	/* initialize fileset inode allocation map */
 	if ((rc = diMount(ipimap))) {
 		jfs_err("jfs_mount: diMount failed w/rc = %d", rc);
 		goto err_ipimap;
 	}
 
+	/* map further access of per fileset inodes by the fileset inode */
+	sbi->ipimap = ipimap;
+
 	return rc;
 
 	/*




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