Patch "btrfs: use the correct superblock to compare fsid in btrfs_validate_super" has been added to the 5.15-stable tree

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

    btrfs: use the correct superblock to compare fsid in btrfs_validate_super

to the 5.15-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:
     btrfs-use-the-correct-superblock-to-compare-fsid-in-btrfs_validate_super.patch
and it can be found in the queue-5.15 subdirectory.

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


>From d167aa76dc0683828588c25767da07fb549e4f48 Mon Sep 17 00:00:00 2001
From: Anand Jain <anand.jain@xxxxxxxxxx>
Date: Mon, 31 Jul 2023 19:16:34 +0800
Subject: btrfs: use the correct superblock to compare fsid in btrfs_validate_super

From: Anand Jain <anand.jain@xxxxxxxxxx>

commit d167aa76dc0683828588c25767da07fb549e4f48 upstream.

The function btrfs_validate_super() should verify the fsid in the provided
superblock argument. Because, all its callers expect it to do that.

Such as in the following stack:

   write_all_supers()
       sb = fs_info->super_for_commit;
       btrfs_validate_write_super(.., sb)
         btrfs_validate_super(.., sb, ..)

   scrub_one_super()
	btrfs_validate_super(.., sb, ..)

And
   check_dev_super()
	btrfs_validate_super(.., sb, ..)

However, it currently verifies the fs_info::super_copy::fsid instead,
which is not correct.  Fix this using the correct fsid in the superblock
argument.

CC: stable@xxxxxxxxxxxxxxx # 5.4+
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
Tested-by: Guilherme G. Piccoli <gpiccoli@xxxxxxxxxx>
Signed-off-by: Anand Jain <anand.jain@xxxxxxxxxx>
Reviewed-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 fs/btrfs/disk-io.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2598,11 +2598,10 @@ int btrfs_validate_super(struct btrfs_fs
 		ret = -EINVAL;
 	}
 
-	if (memcmp(fs_info->fs_devices->fsid, fs_info->super_copy->fsid,
-		   BTRFS_FSID_SIZE)) {
+	if (memcmp(fs_info->fs_devices->fsid, sb->fsid, BTRFS_FSID_SIZE) != 0) {
 		btrfs_err(fs_info,
 		"superblock fsid doesn't match fsid of fs_devices: %pU != %pU",
-			fs_info->super_copy->fsid, fs_info->fs_devices->fsid);
+			  sb->fsid, fs_info->fs_devices->fsid);
 		ret = -EINVAL;
 	}
 


Patches currently in stable-queue which might be from anand.jain@xxxxxxxxxx are

queue-5.15/btrfs-compare-the-correct-fsid-metadata_uuid-in-btrfs_validate_super.patch
queue-5.15/btrfs-use-the-correct-superblock-to-compare-fsid-in-btrfs_validate_super.patch



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