[to-be-updated] ipc-warn-if-trying-to-remove-ipc-object-which-is-absent.patch removed from -mm tree

[akpm@linux-foundation.org]

The patch titled
     Subject: ipc: WARN if trying to remove ipc object which is absent
has been removed from the -mm tree.  Its filename was
     ipc-warn-if-trying-to-remove-ipc-object-which-is-absent.patch

This patch was dropped because an updated version will be merged

------------------------------------------------------
From: Alexander Mikhalitsyn <alexander.mikhalitsyn@virtuozzo.com>
Subject: ipc: WARN if trying to remove ipc object which is absent

Let's produce a warning if we trying to remove non-existing IPC object
from IPC namespace kht/idr structures.

This allows to catch possible bugs when ipc_rmid() function was called
with inconsistent struct ipc_ids*, struct kern_ipc_perm* arguments.

Link: https://lkml.kernel.org/r/20210706132259.71740-3-alexander.mikhalitsyn@virtuozzo.com
Signed-off-by: Alexander Mikhalitsyn <alexander.mikhalitsyn@virtuozzo.com>
Cc: Milton Miller <miltonm@bga.com>
Cc: Jack Miller <millerjo@us.ibm.com>
Cc: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
Cc: Alexander Mikhalitsyn <alexander@mihalicyn.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 ipc/util.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/ipc/util.c~ipc-warn-if-trying-to-remove-ipc-object-which-is-absent
+++ a/ipc/util.c
@@ -447,8 +447,8 @@ static int ipcget_public(struct ipc_name
 static void ipc_kht_remove(struct ipc_ids *ids, struct kern_ipc_perm *ipcp)
 {
 	if (ipcp->key != IPC_PRIVATE)
-		rhashtable_remove_fast(&ids->key_ht, &ipcp->khtnode,
-				       ipc_kht_params);
+		WARN_ON(rhashtable_remove_fast(&ids->key_ht, &ipcp->khtnode,
+				       ipc_kht_params));
 }
 
 /**
@@ -498,7 +498,7 @@ void ipc_rmid(struct ipc_ids *ids, struc
 {
 	int idx = ipcid_to_idx(ipcp->id);
 
-	idr_remove(&ids->ipcs_idr, idx);
+	WARN_ON(idr_remove(&ids->ipcs_idr, idx) != ipcp);
 	ipc_kht_remove(ids, ipcp);
 	ids->in_use--;
 	ipcp->deleted = true;
_

Patches currently in -mm which might be from alexander.mikhalitsyn@virtuozzo.com are