The patch titled
Subject: ocfs2: fix freeing uninitialized resource on ocfs2_dlm_shutdown
has been added to the -mm mm-hotfixes-unstable branch. Its filename is
ocfs2-fix-freeing-uninitialized-resource-on-ocfs2_dlm_shutdown.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/ocfs2-fix-freeing-uninitialized-resource-on-ocfs2_dlm_shutdown.patch
This patch will later appear in the mm-hotfixes-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Heming Zhao via Ocfs2-devel <ocfs2-devel@xxxxxxxxxxxxxx>
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/20220815085754.20417-1-heming.zhao@xxxxxxxx
Fixes: 0737e01de9c4 ("ocfs2: ocfs2_mount_volume does cleanup job before return error")
Signed-off-by: Heming Zhao <heming.zhao@xxxxxxxx>
Reviewed-by: Joseph Qi <joseph.qi@xxxxxxxxxxxxxxxxx>
Cc: Mark Fasheh <mark@xxxxxxxxxx>
Cc: Joel Becker <jlbec@xxxxxxxxxxxx>
Cc: Junxiao Bi <junxiao.bi@xxxxxxxxxx>
Cc: Changwei Ge <gechangwei@xxxxxxx>
Cc: Gang He <ghe@xxxxxxxx>
Cc: Jun Piao <piaojun@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/ocfs2/dlmglue.c | 8 +++++---
fs/ocfs2/super.c | 3 +--
2 files changed, 6 insertions(+), 5 deletions(-)
--- 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);
_
Patches currently in -mm which might be from ocfs2-devel@xxxxxxxxxxxxxx are
ocfs2-fix-freeing-uninitialized-resource-on-ocfs2_dlm_shutdown.patch
