From 550842cc60987b269e31b222283ade3e1b6c7fc8 Mon Sep 17 00:00:00 2001 From: Heming Zhao Date: Mon, 15 Aug 2022 16:57:54 +0800 Subject: [PATCH] ocfs2: fix freeing uninitialized resource on ocfs2_dlm_shutdown 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 Reviewed-by: Joseph Qi Cc: Mark Fasheh Cc: Joel Becker Cc: Junxiao Bi Cc: Changwei Ge Cc: Gang He Cc: Jun Piao Cc: Signed-off-by: Andrew Morton --- fs/ocfs2/dlmglue.c | 8 +++++--- fs/ocfs2/super.c | 3 +-- 2 files changed, 6 insertions(+), 5 deletions(-) diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c index 801e60bab955..c28bc983a7b1 100644 --- a/fs/ocfs2/dlmglue.c +++ b/fs/ocfs2/dlmglue.c @@ -3403,10 +3403,12 @@ void ocfs2_dlm_shutdown(struct ocfs2_super *osb, 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, diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c index 013a727bd7c8..e2cc9eec287c 100644 --- a/fs/ocfs2/super.c +++ b/fs/ocfs2/super.c @@ -1914,8 +1914,7 @@ static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err) !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);