Re: [PATCH 6.1.y] ext4: fix access to uninitialised lock in fc replay path

[Sasha Levin <sashal@kernel.org>]

[ Sasha's backport helper bot ]

Hi,

The upstream commit SHA1 provided is correct: 23dfdb56581ad92a9967bcd720c8c23356af74c1

WARNING: Author mismatch between patch and upstream commit:
Backport author: <jianqi.ren.cn@windriver.com>
Commit author: Luis Henriques (SUSE) <luis.henriques@linux.dev>


Status in newer kernel trees:
6.12.y | Present (exact SHA1)
6.6.y | Not found
6.1.y | Not found

Note: The patch differs from the upstream commit:
---
1:  23dfdb56581ad ! 1:  a7dddfd22e8bc ext4: fix access to uninitialised lock in fc replay path
    @@ Metadata
      ## Commit message ##
         ext4: fix access to uninitialised lock in fc replay path
     
    +    [ commit 23dfdb56581ad92a9967bcd720c8c23356af74c1 upstream ]
    +
         The following kernel trace can be triggered with fstest generic/629 when
         executed against a filesystem with fast-commit feature enabled:
     
    @@ Commit message
         Link: https://patch.msgid.link/20240718094356.7863-1-luis.henriques@linux.dev
         Signed-off-by: Theodore Ts'o <tytso@mit.edu>
         Cc: stable@kernel.org
    +    Signed-off-by: Jianqi Ren <jianqi.ren.cn@windriver.com>
     
      ## fs/ext4/super.c ##
     @@ fs/ext4/super.c: static int __ext4_fill_super(struct fs_context *fc, struct super_block *sb)
    @@ fs/ext4/super.c: static int __ext4_fill_super(struct fs_context *fc, struct supe
      	 * used to detect the metadata async write error.
      	 */
     -	spin_lock_init(&sbi->s_bdev_wb_lock);
    - 	errseq_check_and_advance(&sb->s_bdev->bd_mapping->wb_err,
    + 	errseq_check_and_advance(&sb->s_bdev->bd_inode->i_mapping->wb_err,
      				 &sbi->s_bdev_wb_err);
    - 	EXT4_SB(sb)->s_mount_state |= EXT4_ORPHAN_FS;
    + 	sb->s_bdev->bd_super = sb;
---

Results of testing on various branches:

| Branch                    | Patch Apply | Build Test |
|---------------------------|-------------|------------|
| stable/linux-6.1.y        |  Success    |  Success   |