This is a note to let you know that I've just added the patch titled
btrfs: free btrfs_path before copying fspath to userspace
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-free-btrfs_path-before-copying-fspath-to-userspace.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 8cf96b409d9b3946ece58ced13f92d0f775b0442 Mon Sep 17 00:00:00 2001
From: Anand Jain <anand.jain@xxxxxxxxxx>
Date: Thu, 10 Nov 2022 11:36:29 +0530
Subject: btrfs: free btrfs_path before copying fspath to userspace
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) {
Patches currently in stable-queue which might be from anand.jain@xxxxxxxxxx are
queue-5.15/btrfs-free-btrfs_path-before-copying-fspath-to-userspace.patch
queue-5.15/btrfs-free-btrfs_path-before-copying-subvol-info-to-userspace.patch
queue-5.15/btrfs-free-btrfs_path-before-copying-root-refs-to-userspace.patch
