From ea0fd88b5a443947aab2162b59d06b3f6f6e1649 Mon Sep 17 00:00:00 2001
From: David Sterba <dsterba@suse.com>
Date: Mon, 3 Oct 2016 16:48:53 +0200
Subject: [PATCH] btrfs-progs: don't access freed memory in btrfs_close_devices

Caught by ASAN, as we don't access fs_devices directly, there's no null
deref but 0x30 is still wrong.

Signed-off-by: David Sterba <dsterba@suse.com>
---
 volumes.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/volumes.c b/volumes.c
index da797517..b9ca5502 100644
--- a/volumes.c
+++ b/volumes.c
@@ -162,6 +162,8 @@ int btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
 	struct btrfs_device *device;
 
 again:
+	if (!fs_devices)
+		return 0;
 	while (!list_empty(&fs_devices->devices)) {
 		device = list_entry(fs_devices->devices.next,
 				    struct btrfs_device, dev_list);