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...
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@oss.oracle.com 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@suse.com Fixes: 0737e01de9c4 ("ocfs2: ocfs2_mount_volume does cleanup job before return error") Signed-off-by: Heming Zhao heming.zhao@suse.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 ---
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@oss.oracle.com are
ocfs2-fix-freeing-uninitialized-resource-on-ocfs2_dlm_shutdown.patch