ocfs2: fix panic due to ocfs2_wq is null

commit b918c43021baaa3648de09e19a4a3dd555a45f40 upstream.

mount.ocfs2 failed when reading ocfs2 filesystem superblock encounters
an error.  ocfs2_initialize_super() returns before allocating ocfs2_wq.
ocfs2_dismount_volume() triggers the following panic.

  Oct 15 16:09:27 cnwarekv-205120 kernel: On-disk corruption discovered.Please run fsck.ocfs2 once the filesystem is unmounted.
  Oct 15 16:09:27 cnwarekv-205120 kernel: (mount.ocfs2,22804,44): ocfs2_read_locked_inode:537 ERROR: status = -30
  Oct 15 16:09:27 cnwarekv-205120 kernel: (mount.ocfs2,22804,44): ocfs2_init_global_system_inodes:458 ERROR: status = -30
  Oct 15 16:09:27 cnwarekv-205120 kernel: (mount.ocfs2,22804,44): ocfs2_init_global_system_inodes:491 ERROR: status = -30
  Oct 15 16:09:27 cnwarekv-205120 kernel: (mount.ocfs2,22804,44): ocfs2_initialize_super:2313 ERROR: status = -30
  Oct 15 16:09:27 cnwarekv-205120 kernel: (mount.ocfs2,22804,44): ocfs2_fill_super:1033 ERROR: status = -30
  ------------[ cut here ]------------
  Oops: 0002 [#1] SMP NOPTI
  CPU: 1 PID: 11753 Comm: mount.ocfs2 Tainted: G  E
        4.14.148-200.ckv.x86_64 #1
  Hardware name: Sugon H320-G30/35N16-US, BIOS 0SSDX017 12/21/2018
  task: ffff967af0520000 task.stack: ffffa5f05484000
  RIP: 0010:mutex_lock+0x19/0x20
  Call Trace:
    flush_workqueue+0x81/0x460
    ocfs2_shutdown_local_alloc+0x47/0x440 [ocfs2]
    ocfs2_dismount_volume+0x84/0x400 [ocfs2]
    ocfs2_fill_super+0xa4/0x1270 [ocfs2]
    ? ocfs2_initialize_super.isa.211+0xf20/0xf20 [ocfs2]
    mount_bdev+0x17f/0x1c0
    mount_fs+0x3a/0x160

Link: http://lkml.kernel.org/r/1571139611-24107-1-git-send-email-yili@winhong.com
Signed-off-by: Yi Li <yilikernel@gmail.com>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Jun Piao <piaojun@huawei.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c
index fa947d36ae1d3eb37bbd92bf30f2b531159257d0..a30f63623db702aded5c96c4c130c858e193a218 100644 (file)
--- a/fs/ocfs2/journal.c
+++ b/fs/ocfs2/journal.c
@@ -231,7 +231,8 @@ void ocfs2_recovery_exit(struct ocfs2_super *osb)
        /* At this point, we know that no more recovery threads can be
         * launched, so wait for any recovery completion work to
         * complete. */
-       flush_workqueue(osb->ocfs2_wq);
+       if (osb->ocfs2_wq)
+               flush_workqueue(osb->ocfs2_wq);
 
        /*
         * Now that recovery is shut down, and the osb is about to be

diff --git a/fs/ocfs2/localalloc.c b/fs/ocfs2/localalloc.c
index 5d53d0d63d199838b3fb5109e7e4eaa73fc6327e..ea38677daa06b87c64474bb3946d6c42d4388419 100644 (file)
--- a/fs/ocfs2/localalloc.c
+++ b/fs/ocfs2/localalloc.c
@@ -391,7 +391,8 @@ void ocfs2_shutdown_local_alloc(struct ocfs2_super *osb)
        struct ocfs2_dinode *alloc = NULL;
 
        cancel_delayed_work(&osb->la_enable_wq);
-       flush_workqueue(osb->ocfs2_wq);
+       if (osb->ocfs2_wq)
+               flush_workqueue(osb->ocfs2_wq);
 
        if (osb->local_alloc_state == OCFS2_LA_UNUSED)
                goto out;