linux-kernel - [PATCH 4.19 021/276] btrfs: sysfs: Fix error path kobject memory leak

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Message-Id: <20190530030525.458287378@linuxfoundation.org>
Date:   Wed, 29 May 2019 20:02:59 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, "Tobin C. Harding" <tobin@...nel.org>,
        David Sterba <dsterba@...e.com>
Subject: [PATCH 4.19 021/276] btrfs: sysfs: Fix error path kobject memory leak

From: Tobin C. Harding <tobin@...nel.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@...r.kernel.org # v4.4+
Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Tobin C. Harding <tobin@...nel.org>
Reviewed-by: David Sterba <dsterba@...e.com>
Signed-off-by: David Sterba <dsterba@...e.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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
@@ -3911,8 +3911,7 @@ 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;
 	}