linux-kernel - Re: [PATCH -next] nbd: Fix use-after-free in pid

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Message-Id: <163473900612.733071.518425291980291734.b4-ty@kernel.dk>
Date:   Wed, 20 Oct 2021 08:10:09 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     josef@...icpanda.com, nbd@...er.debian.org,
        linux-block@...r.kernel.org, Ye Bin <yebin10@...wei.com>
Cc:     Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] nbd: Fix use-after-free in pid_show

On Wed, 20 Oct 2021 15:39:59 +0800, Ye Bin wrote:
> I got issue as follows:
> [  263.886511] BUG: KASAN: use-after-free in pid_show+0x11f/0x13f
> [  263.888359] Read of size 4 at addr ffff8880bf0648c0 by task cat/746
> [  263.890479] CPU: 0 PID: 746 Comm: cat Not tainted 4.19.90-dirty #140
> [  263.893162] Call Trace:
> [  263.893509]  dump_stack+0x108/0x15f
> [  263.893999]  print_address_description+0xa5/0x372
> [  263.894641]  kasan_report.cold+0x236/0x2a8
> [  263.895696]  __asan_report_load4_noabort+0x25/0x30
> [  263.896365]  pid_show+0x11f/0x13f
> [  263.897422]  dev_attr_show+0x48/0x90
> [  263.898361]  sysfs_kf_seq_show+0x24d/0x4b0
> [  263.899479]  kernfs_seq_show+0x14e/0x1b0
> [  263.900029]  seq_read+0x43f/0x1150
> [  263.900499]  kernfs_fop_read+0xc7/0x5a0
> [  263.903764]  vfs_read+0x113/0x350
> [  263.904231]  ksys_read+0x103/0x270
> [  263.905230]  __x64_sys_read+0x77/0xc0
> [  263.906284]  do_syscall_64+0x106/0x360
> [  263.906797]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
> 
> [...]

Applied, thanks!

[1/1] nbd: Fix use-after-free in pid_show
      commit: 0c98057be9efa32de78dbc4685fc73da9d71faa1

Best regards,
-- 
Jens Axboe