[merged mm-nonmm-stable] ocfs2-cluster-fix-o2hb_dependent_users-leak-on-pin-failure.patch removed from -mm tree

The quilt patch titled
     Subject: ocfs2: cluster: fix o2hb_dependent_users leak on pin failure
has been removed from the -mm tree.  Its filename was
     ocfs2-cluster-fix-o2hb_dependent_users-leak-on-pin-failure.patch

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

------------------------------------------------------
From: Joseph Qi <[email protected]>
Subject: ocfs2: cluster: fix o2hb_dependent_users leak on pin failure
Date: Wed, 22 Jul 2026 20:49:33 +0800

In o2hb_region_inc_user(), o2hb_dependent_users is incremented
unconditionally before calling o2hb_region_pin().  If the pin fails, the
counter is never decremented and any partially-pinned regions are never
unpinned, since the caller does not call o2hb_region_dec_user() on error.

The leaked counter causes subsequent o2hb_region_inc_user() calls to skip
pinning entirely (the > 1 check), leaving heartbeat regions unprotected.

Fix by rolling back on failure: call o2hb_region_unpin(NULL) to release
any partially-pinned regions and decrement o2hb_dependent_users to restore
the pre-increment state.

Link: https://lore.kernel.org/[email protected]
Fixes: 58a3158a5d17 ("ocfs2/cluster: Pin/unpin o2hb regions")
Signed-off-by: Joseph Qi <[email protected]>
Cc: Mark Fasheh <[email protected]>
Cc: Joel Becker <[email protected]>
Cc: Junxiao Bi <[email protected]>
Cc: Changwei Ge <[email protected]>
Cc: Jun Piao <[email protected]>
Cc: Heming Zhao <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---

 fs/ocfs2/cluster/heartbeat.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/fs/ocfs2/cluster/heartbeat.c~ocfs2-cluster-fix-o2hb_dependent_users-leak-on-pin-failure
+++ a/fs/ocfs2/cluster/heartbeat.c
@@ -2499,8 +2499,13 @@ static int o2hb_region_inc_user(const ch
 		goto unlock;
 
 	if (bitmap_weight(o2hb_quorum_region_bitmap,
-			   O2NM_MAX_REGIONS) <= O2HB_PIN_CUT_OFF)
+			  O2NM_MAX_REGIONS) <= O2HB_PIN_CUT_OFF) {
 		ret = o2hb_region_pin(NULL, false);
+		if (ret) {
+			o2hb_region_unpin(NULL);
+			o2hb_dependent_users--;
+		}
+	}
 
 unlock:
 	spin_unlock(&o2hb_live_lock);
_

Patches currently in -mm which might be from [email protected] are