From: linan666@huaweicloud.com
To: song@kernel.org, gqjiang@suse.com, neilb@suse.com
Cc: linux-raid@vger.kernel.org, linux-kernel@vger.kernel.org,
linan666@huaweicloud.com, yukuai3@huawei.com,
yi.zhang@huawei.com, houtao1@huawei.com, yangerkun@huawei.com
Subject: [PATCH] md: fix kmemleak of rdev->serial
Date: Thu, 8 Feb 2024 16:55:56 +0800 [thread overview]
Message-ID: <20240208085556.2412922-1-linan666@huaweicloud.com> (raw)
From: Li Nan <linan122@huawei.com>
If kobject_add() is fail in bind_rdev_to_array(), 'rdev->serial' will be
alloc not be freed, and kmemleak occurs.
unreferenced object 0xffff88815a350000 (size 49152):
comm "mdadm", pid 789, jiffies 4294716910
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace (crc f773277a):
[<0000000058b0a453>] kmemleak_alloc+0x61/0xe0
[<00000000366adf14>] __kmalloc_large_node+0x15e/0x270
[<000000002e82961b>] __kmalloc_node.cold+0x11/0x7f
[<00000000f206d60a>] kvmalloc_node+0x74/0x150
[<0000000034bf3363>] rdev_init_serial+0x67/0x170
[<0000000010e08fe9>] mddev_create_serial_pool+0x62/0x220
[<00000000c3837bf0>] bind_rdev_to_array+0x2af/0x630
[<0000000073c28560>] md_add_new_disk+0x400/0x9f0
[<00000000770e30ff>] md_ioctl+0x15bf/0x1c10
[<000000006cfab718>] blkdev_ioctl+0x191/0x3f0
[<0000000085086a11>] vfs_ioctl+0x22/0x60
[<0000000018b656fe>] __x64_sys_ioctl+0xba/0xe0
[<00000000e54e675e>] do_syscall_64+0x71/0x150
[<000000008b0ad622>] entry_SYSCALL_64_after_hwframe+0x6c/0x74
Fixes: 963c555e75b0 ("md: introduce mddev_create/destroy_wb_pool for the change of member device")
Signed-off-by: Li Nan <linan122@huawei.com>
---
drivers/md/md.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/md/md.c b/drivers/md/md.c
index e05858653a41..350f5b22ba6f 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -2536,6 +2536,7 @@ static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev)
fail:
pr_warn("md: failed to register dev-%s for %s\n",
b, mdname(mddev));
+ mddev_destroy_serial_pool(mddev, rdev);
return err;
}
--
2.39.2
next reply other threads:[~2024-02-08 9:00 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-08 8:55 linan666 [this message]
2024-02-12 23:23 ` [PATCH] md: fix kmemleak of rdev->serial Song Liu
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