The patch below does not apply to the 4.9-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
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: [PATCH] btrfs: sysfs: Fix error path kobject memory leak
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
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index f79e477a378e..9bcb3570750e 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -3882,8 +3882,7 @@ static int create_space_info(struct btrfs_fs_info *info, u64 flags) 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; }