releases/5.1.6/btrfs-sysfs-fix-error-path-kobject-memory-leak.patch

From 450ff8348808a89cc27436771aa05c2b90c0eef1 Mon Sep 17 00:00:00 2001
From: "Tobin C. Harding" <tobin@kernel.org>
Date: Mon, 13 May 2019 13:39:11 +1000
Subject: btrfs: sysfs: Fix error path kobject memory leak

From: Tobin C. Harding <tobin@kernel.org>

commit 450ff8348808a89cc27436771aa05c2b90c0eef1 upstream.

If a call to kobject_init_and_add() fails we must call kobject_put()
otherwise we leak memory.

Calling kobject_put() when kobject_init_and_add() fails drops the
refcount back to 0 and calls the ktype release method (which in turn
calls the percpu destroy and kfree).

Add call to kobject_put() in the error path of call to
kobject_init_and_add().

Cc: stable@vger.kernel.org # v4.4+
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Tobin C. Harding <tobin@kernel.org>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/btrfs/extent-tree.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -3981,8 +3981,7 @@ static int create_space_info(struct btrf
 				    info->space_info_kobj, "%s",
 				    alloc_name(space_info->flags));
 	if (ret) {
-		percpu_counter_destroy(&space_info->total_bytes_pinned);
-		kfree(space_info);
+		kobject_put(&space_info->kobj);
 		return ret;
 	}