The patch titled
Subject: ipc: fix memleak if msg_init_ns failed in create_ipc_ns
has been added to the -mm mm-nonmm-unstable branch. Its filename is
ipc-fix-memleak-if-msg_init_ns-failed-in-create_ipc_ns.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/ipc-fix-memleak-if-msg_init_ns-failed-in-create_ipc_ns.patch
This patch will later appear in the mm-nonmm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Wupeng Ma <mawupeng1@xxxxxxxxxx>
Subject: ipc: fix memleak if msg_init_ns failed in create_ipc_ns
Date: Wed, 23 Oct 2024 17:31:29 +0800
Percpu memory allocation may failed during create_ipc_ns however this
fail is not handled properly since ipc sysctls and mq sysctls is not
released properly. Fix this by release these two resource when failure.
Here is the kmemleak stack when percpu failed:
unreferenced object 0xffff88819de2a600 (size 512):
comm "shmem_2nstest", pid 120711, jiffies 4300542254
hex dump (first 32 bytes):
60 aa 9d 84 ff ff ff ff fc 18 48 b2 84 88 ff ff `.........H.....
04 00 00 00 a4 01 00 00 20 e4 56 81 ff ff ff ff ........ .V.....
backtrace (crc be7cba35):
[<ffffffff81b43f83>] __kmalloc_node_track_caller_noprof+0x333/0x420
[<ffffffff81a52e56>] kmemdup_noprof+0x26/0x50
[<ffffffff821b2f37>] setup_mq_sysctls+0x57/0x1d0
[<ffffffff821b29cc>] copy_ipcs+0x29c/0x3b0
[<ffffffff815d6a10>] create_new_namespaces+0x1d0/0x920
[<ffffffff815d7449>] copy_namespaces+0x2e9/0x3e0
[<ffffffff815458f3>] copy_process+0x29f3/0x7ff0
[<ffffffff8154b080>] kernel_clone+0xc0/0x650
[<ffffffff8154b6b1>] __do_sys_clone+0xa1/0xe0
[<ffffffff843df8ff>] do_syscall_64+0xbf/0x1c0
[<ffffffff846000b0>] entry_SYSCALL_64_after_hwframe+0x4b/0x53
Link: https://lkml.kernel.org/r/20241023093129.3074301-1-mawupeng1@xxxxxxxxxx
Fixes: 72d1e611082e ("ipc/msg: mitigate the lock contention with percpu counter")
Signed-off-by: Ma Wupeng <mawupeng1@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
ipc/namespace.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/ipc/namespace.c~ipc-fix-memleak-if-msg_init_ns-failed-in-create_ipc_ns
+++ a/ipc/namespace.c
@@ -83,13 +83,15 @@ static struct ipc_namespace *create_ipc_
err = msg_init_ns(ns);
if (err)
- goto fail_put;
+ goto fail_ipc;
sem_init_ns(ns);
shm_init_ns(ns);
return ns;
+fail_ipc:
+ retire_ipc_sysctls(ns);
fail_mq:
retire_mq_sysctls(ns);
_
Patches currently in -mm which might be from mawupeng1@xxxxxxxxxx are
ipc-fix-memleak-if-msg_init_ns-failed-in-create_ipc_ns.patch
