linux-kernel - Re: [PATCH] block: Fix possible memory leak for rq_wb on add

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Date:   Mon, 31 Oct 2022 07:32:12 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     linux-kernel@...r.kernel.org,
        Chen Zhongjin <chenzhongjin@...wei.com>,
        linux-block@...r.kernel.org
Cc:     mcgrof@...nel.org, hare@...e.de
Subject: Re: [PATCH] block: Fix possible memory leak for rq_wb on add_disk failure

On Sat, 29 Oct 2022 15:13:55 +0800, Chen Zhongjin wrote:
> kmemleak reported memory leaks in device_add_disk():
> 
> kmemleak: 3 new suspected memory leaks
> 
> unreferenced object 0xffff88800f420800 (size 512):
>   comm "modprobe", pid 4275, jiffies 4295639067 (age 223.512s)
>   hex dump (first 32 bytes):
>     04 00 00 00 08 00 00 00 01 00 00 00 00 00 00 00  ................
>     00 e1 f5 05 00 00 00 00 00 00 00 00 00 00 00 00  ................
>   backtrace:
>     [<00000000d3662699>] kmalloc_trace+0x26/0x60
>     [<00000000edc7aadc>] wbt_init+0x50/0x6f0
>     [<0000000069601d16>] wbt_enable_default+0x157/0x1c0
>     [<0000000028fc393f>] blk_register_queue+0x2a4/0x420
>     [<000000007345a042>] device_add_disk+0x6fd/0xe40
>     [<0000000060e6aab0>] nbd_dev_add+0x828/0xbf0 [nbd]
>     ...
> 
> [...]

Applied, thanks!

[1/1] block: Fix possible memory leak for rq_wb on add_disk failure
      (no commit info)

Best regards,
-- 
Jens Axboe