[PATCH 5.15 197/206] btrfs: free btrfs_path before copying fspath to userspace

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From: Anand Jain <anand.jain@xxxxxxxxxx>

commit 8cf96b409d9b3946ece58ced13f92d0f775b0442 upstream.

btrfs_ioctl_ino_to_path() frees the search path after the userspace copy
from the temp buffer @ipath->fspath. Which potentially can lead to a lock
splat warning.

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

CC: stable@xxxxxxxxxxxxxxx # 4.19+
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/ioctl.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -3892,6 +3892,8 @@ static long btrfs_ioctl_ino_to_path(stru
 		ipath->fspath->val[i] = rel_ptr;
 	}
 
+	btrfs_free_path(path);
+	path = NULL;
 	ret = copy_to_user((void __user *)(unsigned long)ipa->fspath,
 			   ipath->fspath, size);
 	if (ret) {





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