FAILED: patch "[PATCH] btrfs: free btrfs_path before copying inodes to userspace" failed to apply to 5.15-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

Possible dependencies:

418ffb9e3cf6 ("btrfs: free btrfs_path before copying inodes to userspace")
e3059ec06b9f ("btrfs: sink iterator parameter to btrfs_ioctl_logical_to_ino")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 418ffb9e3cf6c4e2574d3a732b724916684bd133 Mon Sep 17 00:00:00 2001
From: Anand Jain <anand.jain@oracle.com>
Date: Thu, 10 Nov 2022 11:36:28 +0530
Subject: [PATCH] btrfs: free btrfs_path before copying inodes to userspace

btrfs_ioctl_logical_to_ino() frees the search path after the userspace
copy from the temp buffer @inodes. Which potentially can lead to a lock
splat.

Fix this by freeing the path before we copy @inodes to userspace.

CC: stable@vger.kernel.org # 4.19+
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 89b8d14cb68c..b595f2c6dfc9 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -4282,21 +4282,20 @@ static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info,
 		size = min_t(u32, loi->size, SZ_16M);
 	}
 
-	path = btrfs_alloc_path();
-	if (!path) {
-		ret = -ENOMEM;
-		goto out;
-	}
-
 	inodes = init_data_container(size);
 	if (IS_ERR(inodes)) {
 		ret = PTR_ERR(inodes);
-		inodes = NULL;
-		goto out;
+		goto out_loi;
 	}
 
+	path = btrfs_alloc_path();
+	if (!path) {
+		ret = -ENOMEM;
+		goto out;
+	}
 	ret = iterate_inodes_from_logical(loi->logical, fs_info, path,
 					  inodes, ignore_offset);
+	btrfs_free_path(path);
 	if (ret == -EINVAL)
 		ret = -ENOENT;
 	if (ret < 0)
@@ -4308,7 +4307,6 @@ static long btrfs_ioctl_logical_to_ino(struct btrfs_fs_info *fs_info,
 		ret = -EFAULT;
 
 out:
-	btrfs_free_path(path);
 	kvfree(inodes);
 out_loi:
 	kfree(loi);