[merged mm-hotfixes-stable] ipc-msgc-fix-percpu_counter-use-after-free.patch removed from -mm tree

[merged mm-hotfixes-stable] ipc-msgc-fix-percpu_counter-use-after-free.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: ipc/msg.c: fix percpu_counter use after free
has been removed from the -mm tree.  Its filename was
     ipc-msgc-fix-percpu_counter-use-after-free.patch

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

------------------------------------------------------
From: Andrew Morton <akpm@linux-foundation.org>
Subject: ipc/msg.c: fix percpu_counter use after free
Date: Thu Oct 20 09:19:22 PM PDT 2022

These percpu counters are referenced in free_ipcs->freeque, so destroy
them later.

Fixes: 72d1e611082e ("ipc/msg: mitigate the lock contention with percpu counter")
Reported-by: syzbot+96e659d35b9d6b541152@syzkaller.appspotmail.com
Tested-by: Mark Rutland <mark.rutland@arm.com>
Cc: Jiebin Sun <jiebin.sun@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---


--- a/ipc/msg.c~ipc-msgc-fix-percpu_counter-use-after-free
+++ a/ipc/msg.c
@@ -1329,11 +1329,11 @@ fail_msg_bytes:
 #ifdef CONFIG_IPC_NS
 void msg_exit_ns(struct ipc_namespace *ns)
 {
-	percpu_counter_destroy(&ns->percpu_msg_bytes);
-	percpu_counter_destroy(&ns->percpu_msg_hdrs);
 	free_ipcs(ns, &msg_ids(ns), freeque);
 	idr_destroy(&ns->ids[IPC_MSG_IDS].ipcs_idr);
 	rhashtable_destroy(&ns->ids[IPC_MSG_IDS].key_ht);
+	percpu_counter_destroy(&ns->percpu_msg_bytes);
+	percpu_counter_destroy(&ns->percpu_msg_hdrs);
 }
 #endif
 
_

Patches currently in -mm which might be from akpm@linux-foundation.org are

mm-memremap_pages-replace-zone_device_page_init-with-pgmap_request_folios-fix.patch
mm-hugetlb-convert-free_huge_page-to-folios-fix.patch
vmalloc-add-reviewers-for-vmalloc-code-checkpatch-fixes.patch
mm-memremap-introduce-pgmap_request_folio-using-pgmap-offsets-fix.patch
mm-memremap-introduce-pgmap_request_folio-using-pgmap-offsets-fix-2.patch
mm-gup-remove-foll_migration-fix.patch
mm-use-stack_depot-for-recording-kmemleaks-backtrace-checkpatch-fixes.patch
mm-use-stack_depot-for-recording-kmemleaks-backtrace-fix.patch
kasan-allow-sampling-page_alloc-allocations-for-hw_tags-fix.patch
powerpc-ptrace-user_regset_copyin_ignore-always-returns-0-fix.patch
minmax-sanity-check-constant-bounds-when-clamping-checkpatch-fixes.patch
minmax-sanity-check-constant-bounds-when-clamping-checkpatch-fixes-fix.patch
proc-report-open-files-as-size-in-stat-for-proc-pid-fd-v3-fix.patch