linux-kernel - [PATCH] ipc: fix memleak if msg_init_ns failed in create_ipc

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Message-ID: <20241023093129.3074301-1-mawupeng1@huawei.com>
Date: Wed, 23 Oct 2024 17:31:29 +0800
From: Wupeng Ma <mawupeng1@...wei.com>
To: <akpm@...ux-foundation.org>, <tim.c.chen@...ux.intel.com>
CC: <jiebin.sun@...el.com>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] ipc: fix memleak if msg_init_ns failed in create_ipc_ns

From: Ma Wupeng <mawupeng1@...wei.com>

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

Fixes: 72d1e611082e ("ipc/msg: mitigate the lock contention with percpu counter")
Signed-off-by: Ma Wupeng <mawupeng1@...wei.com>
---
 ipc/namespace.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/ipc/namespace.c b/ipc/namespace.c
index 6ecc30effd3e..4df91ceeeafe 100644
--- a/ipc/namespace.c
+++ b/ipc/namespace.c
@@ -83,13 +83,15 @@ static struct ipc_namespace *create_ipc_ns(struct user_namespace *user_ns,
 
 	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);
 
-- 
2.25.1