linux-kernel - Re: [PATCH] md: fix kmemleak of rdev->serial

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Date: Mon, 12 Feb 2024 15:23:59 -0800
From: Song Liu <song@...nel.org>
To: linan666@...weicloud.com
Cc: gqjiang@...e.com, neilb@...e.com, linux-raid@...r.kernel.org, 
	linux-kernel@...r.kernel.org, yukuai3@...wei.com, yi.zhang@...wei.com, 
	houtao1@...wei.com, yangerkun@...wei.com
Subject: Re: [PATCH] md: fix kmemleak of rdev->serial

On Thu, Feb 8, 2024 at 1:00 AM <linan666@...weicloud.com> wrote:
>
> From: Li Nan <linan122@...wei.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@...wei.com>

LGTM. Applied to md-6.9.

Thanks,
Song