[PATCH] btrfs-progs: avoid memory leak in btrfs_close_devices

[Wang Sheng-Hui <shhuiw@gmail.com>]

Three kind of structures need to be freed on close:
      * All struct btrfs_device managed by fs_devices
      * The name field for each struct btrfs_device
      * The above items for seed_devices

Signed-off-by: Wang Sheng-Hui <shhuiw@gmail.com>
---
  volumes.c |   16 +++++++++++++---
  1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/volumes.c b/volumes.c
index d6f81f8..257b740 100644
--- a/volumes.c
+++ b/volumes.c
@@ -153,6 +153,16 @@ static int device_list_add(const char *path,
  	return 0;
  }

+static void btrfs_close_device(struct btrfs_device *device)
+{
+	close(device->fd);
+	device->fd = -1;
+	device->writeable = 0;
+	if (device->name)
+		kfree(device->name);
+	kfree(device);
+}
+
  int btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
  {
  	struct btrfs_fs_devices *seed_devices;
@@ -161,17 +171,17 @@ int btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
  again:
  	list_for_each(cur, &fs_devices->devices) {
  		device = list_entry(cur, struct btrfs_device, dev_list);
-		close(device->fd);
-		device->fd = -1;
-		device->writeable = 0;
+		btrfs_close_device(device);
  	}

  	seed_devices = fs_devices->seed;
  	fs_devices->seed = NULL;
  	if (seed_devices) {
+		kfree(fs_devices);
  		fs_devices = seed_devices;
  		goto again;
  	}
+	kfree(fs_devices);

  	return 0;
  }
-- 
1.7.10.4