[merged,mm-stable] ocfs2-fix-freeing-uninitialized-resource-on-ocfs2_dlm_shutdown.patch removed from -mm tree

Commit Message

Andrew Morton Aug. 28, 2022, 9:03 p.m. UTC

The quilt patch titled
     Subject: ocfs2: fix freeing uninitialized resource on ocfs2_dlm_shutdown
has been removed from the -mm tree.  Its filename was
     ocfs2-fix-freeing-uninitialized-resource-on-ocfs2_dlm_shutdown.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Heming Zhao <[e-mail]>
Subject: ocfs2: fix freeing uninitialized resource on ocfs2_dlm_shutdown
Date: Mon, 15 Aug 2022 16:57:54 +0800

After commit 0737e01de9c4 ("ocfs2: ocfs2_mount_volume does cleanup job
before return error"), any procedure after ocfs2_dlm_init() fails will
trigger crash when calling ocfs2_dlm_shutdown().

ie: On local mount mode, no dlm resource is initialized.  If
ocfs2_mount_volume() fails in ocfs2_find_slot(), error handling will call
ocfs2_dlm_shutdown(), then does dlm resource cleanup job, which will
trigger kernel crash.

This solution should bypass uninitialized resources in
ocfs2_dlm_shutdown().

Link: https://lkml.kernel.org/r/[e-mail]
Fixes: 0737e01de9c4 ("ocfs2: ocfs2_mount_volume does cleanup job before return error")
Signed-off-by: Heming Zhao <[e-mail]>
Reviewed-by: Joseph Qi <[e-mail]>
Cc: Mark Fasheh <[e-mail]>
Cc: Joel Becker <[e-mail]>
Cc: Junxiao Bi <[e-mail]>
Cc: Changwei Ge <[e-mail]>
Cc: Gang He <[e-mail]>
Cc: Jun Piao <[e-mail]>
Cc: <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
---

 fs/ocfs2/dlmglue.c |    8 +++++---
 fs/ocfs2/super.c   |    3 +--
 2 files changed, 6 insertions(+), 5 deletions(-)

Patch

--- a/fs/ocfs2/dlmglue.c~ocfs2-fix-freeing-uninitialized-resource-on-ocfs2_dlm_shutdown
+++ a/fs/ocfs2/dlmglue.c
@@ -3403,10 +3403,12 @@  void ocfs2_dlm_shutdown(struct ocfs2_sup
 	ocfs2_lock_res_free(&osb->osb_nfs_sync_lockres);
 	ocfs2_lock_res_free(&osb->osb_orphan_scan.os_lockres);
 
-	ocfs2_cluster_disconnect(osb->cconn, hangup_pending);
-	osb->cconn = NULL;
+	if (osb->cconn) {
+		ocfs2_cluster_disconnect(osb->cconn, hangup_pending);
+		osb->cconn = NULL;
 
-	ocfs2_dlm_shutdown_debug(osb);
+		ocfs2_dlm_shutdown_debug(osb);
+	}
 }
 
 static int ocfs2_drop_lock(struct ocfs2_super *osb,
--- a/fs/ocfs2/super.c~ocfs2-fix-freeing-uninitialized-resource-on-ocfs2_dlm_shutdown
+++ a/fs/ocfs2/super.c
@@ -1914,8 +1914,7 @@  static void ocfs2_dismount_volume(struct
 	    !ocfs2_is_hard_readonly(osb))
 		hangup_needed = 1;
 
-	if (osb->cconn)
-		ocfs2_dlm_shutdown(osb, hangup_needed);
+	ocfs2_dlm_shutdown(osb, hangup_needed);
 
 	ocfs2_blockcheck_stats_debugfs_remove(&osb->osb_ecc_stats);
 	debugfs_remove_recursive(osb->osb_debug_root);