linux-kernel - [PATCH 4.4 62/90] btrfs: fix memory leak in update_space

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Message-Id: <20170612152600.481860761@linuxfoundation.org>
Date:   Mon, 12 Jun 2017 17:26:08 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jeff Mahoney <jeffm@...e.com>,
        Liu Bo <bo.li.liu@...cle.com>, David Sterba <dsterba@...e.com>
Subject: [PATCH 4.4 62/90] btrfs: fix memory leak in update_space_info failure path

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jeff Mahoney <jeffm@...e.com>

commit 896533a7da929136d0432713f02a3edffece2826 upstream.

If we fail to add the space_info kobject, we'll leak the memory
for the percpu counter.

Fixes: 6ab0a2029c (btrfs: publish allocation data in sysfs)
Signed-off-by: Jeff Mahoney <jeffm@...e.com>
Reviewed-by: Liu Bo <bo.li.liu@...cle.com>
Signed-off-by: David Sterba <dsterba@...e.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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

--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -3854,6 +3854,7 @@ static int update_space_info(struct btrf
 				    info->space_info_kobj, "%s",
 				    alloc_name(found->flags));
 	if (ret) {
+		percpu_counter_destroy(&found->total_bytes_pinned);
 		kfree(found);
 		return ret;
 	}