fs: btrfs: volumes.c: Fix for possible null pointer dereference

There is otherwise a risk of a possible null pointer dereference.

Was largely found by using a static code analysis program called cppcheck.

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
Signed-off-by: Chris Mason <clm@fb.com>

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 7d725a9ce6708d91b9c155157f915ea8737a3073..ffeed6d6326fed0685ae1e5f25fd1cf0ff88717f 100644 (file)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1690,11 +1690,12 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
                struct btrfs_fs_devices *fs_devices;
                fs_devices = root->fs_info->fs_devices;
                while (fs_devices) {
-                       if (fs_devices->seed == cur_devices)
+                       if (fs_devices->seed == cur_devices) {
+                               fs_devices->seed = cur_devices->seed;
                                break;
+                       }
                        fs_devices = fs_devices->seed;
                }
-               fs_devices->seed = cur_devices->seed;
                cur_devices->seed = NULL;
                lock_chunks(root);
                __btrfs_close_devices(cur_devices);