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/patche…
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(a)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(a)suse.com>
Reviewed-by: Joseph Qi <joseph.qi(a)linux.alibaba.com>
Cc: Mark Fasheh <mark(a)fasheh.com>
Cc: Joel Becker <jlbec(a)evilplan.org>
Cc: Junxiao Bi <junxiao.bi(a)oracle.com>
Cc: Changwei Ge <gechangwei(a)live.cn>
Cc: Gang He <ghe(a)suse.com>
Cc: Jun Piao <piaojun(a)huawei.com>
Cc: <stable(a)vger.kernel.org>
Signed-off-by: Andrew Morton <akpm(a)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(a)oss.oracle.com are
ocfs2-fix-freeing-uninitialized-resource-on-ocfs2_dlm_shutdown.patch
This fixes broken atomic checks which cause a race between the
release-timer and processing of hid input.
I noticed that contacts were sometimes sticking, even with the "sticky
fingers" quirk enabled. This fixes that problem.
Cc: stable(a)vger.kernel.org
Fixes: 9609827458c3 ("HID: multitouch: optimize the sticky fingers timer")
Signed-off-by: Andri Yngvason <andri(a)yngvason.is>
---
V1 -> V2: Clarified where the race is and added Fixes tag as suggested
by Greg KH
V2 -> V3: Fix formatting of "Fixes" tag
drivers/hid/hid-multitouch.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
index 2e72922e36f5..91a4d3fc30e0 100644
--- a/drivers/hid/hid-multitouch.c
+++ b/drivers/hid/hid-multitouch.c
@@ -1186,7 +1186,7 @@ static void mt_touch_report(struct hid_device *hid,
int contact_count = -1;
/* sticky fingers release in progress, abort */
- if (test_and_set_bit(MT_IO_FLAGS_RUNNING, &td->mt_io_flags))
+ if (test_and_set_bit_lock(MT_IO_FLAGS_RUNNING, &td->mt_io_flags))
return;
scantime = *app->scantime;
@@ -1267,7 +1267,7 @@ static void mt_touch_report(struct hid_device *hid,
del_timer(&td->release_timer);
}
- clear_bit(MT_IO_FLAGS_RUNNING, &td->mt_io_flags);
+ clear_bit_unlock(MT_IO_FLAGS_RUNNING, &td->mt_io_flags);
}
static int mt_touch_input_configured(struct hid_device *hdev,
@@ -1699,11 +1699,11 @@ static void mt_expired_timeout(struct timer_list *t)
* An input report came in just before we release the sticky fingers,
* it will take care of the sticky fingers.
*/
- if (test_and_set_bit(MT_IO_FLAGS_RUNNING, &td->mt_io_flags))
+ if (test_and_set_bit_lock(MT_IO_FLAGS_RUNNING, &td->mt_io_flags))
return;
if (test_bit(MT_IO_FLAGS_PENDING_SLOTS, &td->mt_io_flags))
mt_release_contacts(hdev);
- clear_bit(MT_IO_FLAGS_RUNNING, &td->mt_io_flags);
+ clear_bit_unlock(MT_IO_FLAGS_RUNNING, &td->mt_io_flags);
}
static int mt_probe(struct hid_device *hdev, const struct hid_device_id *id)
--
2.37.1