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Date: Thu, 10 Nov 2022 13:04:46 +0800
From: ruanjinjie <ruanjinjie@...wei.com>
To: <mst@...hat.com>, <jasowang@...hat.com>, <sgarzare@...hat.com>,
<eperezma@...hat.com>, <gautam.dawar@...inx.com>,
<elic@...dia.com>, <virtualization@...ts.linux-foundation.org>,
<linux-kernel@...r.kernel.org>
CC: <ruanjinjie@...wei.com>
Subject: [PATCH v2] vdpa_sim: fix possible memory leak in vdpasim_net_init() and vdpasim_blk_init()
Inject fault while probing module, if device_register() fails in
vdpasim_net_init() or vdpasim_blk_init(), but the refcount of kobject is
not decreased to 0, the name allocated in dev_set_name() is leaked.
Fix this by calling put_device(), so that name can be freed in
callback function kobject_cleanup().
(vdpa_sim_net)
unreferenced object 0xffff88807eebc370 (size 16):
comm "modprobe", pid 3848, jiffies 4362982860 (age 18.153s)
hex dump (first 16 bytes):
76 64 70 61 73 69 6d 5f 6e 65 74 00 6b 6b 6b a5 vdpasim_net.kkk.
backtrace:
[<ffffffff8174f19e>] __kmalloc_node_track_caller+0x4e/0x150
[<ffffffff81731d53>] kstrdup+0x33/0x60
[<ffffffff83a5d421>] kobject_set_name_vargs+0x41/0x110
[<ffffffff82d87aab>] dev_set_name+0xab/0xe0
[<ffffffff82d91a23>] device_add+0xe3/0x1a80
[<ffffffffa0270013>] 0xffffffffa0270013
[<ffffffff81001c27>] do_one_initcall+0x87/0x2e0
[<ffffffff813739cb>] do_init_module+0x1ab/0x640
[<ffffffff81379d20>] load_module+0x5d00/0x77f0
[<ffffffff8137bc40>] __do_sys_finit_module+0x110/0x1b0
[<ffffffff83c4d505>] do_syscall_64+0x35/0x80
[<ffffffff83e0006a>] entry_SYSCALL_64_after_hwframe+0x46/0xb0
(vdpa_sim_blk)
unreferenced object 0xffff8881070c1250 (size 16):
comm "modprobe", pid 6844, jiffies 4364069319 (age 17.572s)
hex dump (first 16 bytes):
76 64 70 61 73 69 6d 5f 62 6c 6b 00 6b 6b 6b a5 vdpasim_blk.kkk.
backtrace:
[<ffffffff8174f19e>] __kmalloc_node_track_caller+0x4e/0x150
[<ffffffff81731d53>] kstrdup+0x33/0x60
[<ffffffff83a5d421>] kobject_set_name_vargs+0x41/0x110
[<ffffffff82d87aab>] dev_set_name+0xab/0xe0
[<ffffffff82d91a23>] device_add+0xe3/0x1a80
[<ffffffffa0220013>] 0xffffffffa0220013
[<ffffffff81001c27>] do_one_initcall+0x87/0x2e0
[<ffffffff813739cb>] do_init_module+0x1ab/0x640
[<ffffffff81379d20>] load_module+0x5d00/0x77f0
[<ffffffff8137bc40>] __do_sys_finit_module+0x110/0x1b0
[<ffffffff83c4d505>] do_syscall_64+0x35/0x80
[<ffffffff83e0006a>] entry_SYSCALL_64_after_hwframe+0x46/0xb0
Signed-off-by: ruanjinjie <ruanjinjie@...wei.com>
---
v2:
- add fault inject message
---
drivers/vdpa/vdpa_sim/vdpa_sim_blk.c | 4 +++-
drivers/vdpa/vdpa_sim/vdpa_sim_net.c | 4 +++-
2 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c b/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
index c6db1a1baf76..f745926237a8 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
@@ -427,8 +427,10 @@ static int __init vdpasim_blk_init(void)
int ret;
ret = device_register(&vdpasim_blk_mgmtdev);
- if (ret)
+ if (ret) {
+ put_device(&vdpasim_blk_mgmtdev);
return ret;
+ }
ret = vdpa_mgmtdev_register(&mgmt_dev);
if (ret)
diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim_net.c b/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
index c3cb225ea469..11f5a121df24 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim_net.c
@@ -305,8 +305,10 @@ static int __init vdpasim_net_init(void)
int ret;
ret = device_register(&vdpasim_net_mgmtdev);
- if (ret)
+ if (ret) {
+ put_device(&vdpasim_net_mgmtdev);
return ret;
+ }
ret = vdpa_mgmtdev_register(&mgmt_dev);
if (ret)
--
2.25.1
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