fs: btrfs: volumes.c: Fix for possible null pointer dereference
authorRickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
Thu, 22 May 2014 20:43:43 +0000 (22:43 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Tue, 1 Jul 2014 03:09:46 +0000 (20:09 -0700)
commit 8321cf2596d283821acc466377c2b85bcd3422b7 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
fs/btrfs/volumes.c

index cd8172dcd7542bcffa1890b9a3dcfffc6db06310..7fc774639a7879251ec32433d69b18d071d5e7fb 100644 (file)
@@ -1628,11 +1628,12 @@ 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);