stable.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org, Li Jinlin <lijinlin3@huawei.com>,
	Jens Axboe <axboe@kernel.dk>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.4 21/23] blk-throttle: fix UAF by deleteing timer in blk_throtl_exit()
Date: Fri, 24 Sep 2021 14:44:02 +0200	[thread overview]
Message-ID: <20210924124328.509226388@linuxfoundation.org> (raw)
In-Reply-To: <20210924124327.816210800@linuxfoundation.org>

From: Li Jinlin <lijinlin3@huawei.com>

[ Upstream commit 884f0e84f1e3195b801319c8ec3d5774e9bf2710 ]

The pending timer has been set up in blk_throtl_init(). However, the
timer is not deleted in blk_throtl_exit(). This means that the timer
handler may still be running after freeing the timer, which would
result in a use-after-free.

Fix by calling del_timer_sync() to delete the timer in blk_throtl_exit().

Signed-off-by: Li Jinlin <lijinlin3@huawei.com>
Link: https://lore.kernel.org/r/20210907121242.2885564-1-lijinlin3@huawei.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 block/blk-throttle.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 17bdd6b55beb..fbd08c4569ce 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -1588,6 +1588,7 @@ int blk_throtl_init(struct request_queue *q)
 void blk_throtl_exit(struct request_queue *q)
 {
 	BUG_ON(!q->td);
+	del_timer_sync(&q->td->service_queue.pending_timer);
 	throtl_shutdown_wq(q);
 	blkcg_deactivate_policy(q, &blkcg_policy_throtl);
 	kfree(q->td);
-- 
2.33.0




  parent reply	other threads:[~2021-09-24 12:46 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-24 12:43 [PATCH 4.4 00/23] 4.4.285-rc1 review Greg Kroah-Hartman
2021-09-24 12:43 ` [PATCH 4.4 01/23] s390/bpf: Fix optimizing out zero-extensions Greg Kroah-Hartman
2021-09-24 12:43 ` [PATCH 4.4 02/23] PM / wakeirq: Fix unbalanced IRQ enable for wakeirq Greg Kroah-Hartman
2021-09-24 12:43 ` [PATCH 4.4 03/23] sctp: validate chunk size in __rcv_asconf_lookup Greg Kroah-Hartman
2021-09-24 12:43 ` [PATCH 4.4 04/23] sctp: add param size validation for SCTP_PARAM_SET_PRIMARY Greg Kroah-Hartman
2021-09-24 12:43 ` [PATCH 4.4 05/23] thermal/drivers/exynos: Fix an error code in exynos_tmu_probe() Greg Kroah-Hartman
2021-09-24 12:43 ` [PATCH 4.4 06/23] 9p/trans_virtio: Remove sysfs file on probe failure Greg Kroah-Hartman
2021-09-24 12:43 ` [PATCH 4.4 07/23] prctl: allow to setup brk for et_dyn executables Greg Kroah-Hartman
2021-09-24 12:43 ` [PATCH 4.4 08/23] profiling: fix shift-out-of-bounds bugs Greg Kroah-Hartman
2021-09-24 12:43 ` [PATCH 4.4 09/23] pwm: mxs: Dont modify HW state in .probe() after the PWM chip was registered Greg Kroah-Hartman
2021-09-24 12:43 ` [PATCH 4.4 10/23] dmaengine: acpi-dma: check for 64-bit MMIO address Greg Kroah-Hartman
2021-09-24 12:43 ` [PATCH 4.4 11/23] dmaengine: acpi: Avoid comparison GSI with Linux vIRQ Greg Kroah-Hartman
2021-09-24 12:43 ` [PATCH 4.4 12/23] parisc: Move pci_dev_is_behind_card_dino to where it is used Greg Kroah-Hartman
2021-09-24 12:43 ` [PATCH 4.4 13/23] dmaengine: ioat: depends on !UML Greg Kroah-Hartman
2021-09-24 12:43 ` [PATCH 4.4 14/23] ceph: lockdep annotations for try_nonblocking_invalidate Greg Kroah-Hartman
2021-09-24 12:43 ` [PATCH 4.4 15/23] nilfs2: fix memory leak in nilfs_sysfs_create_device_group Greg Kroah-Hartman
2021-09-24 12:43 ` [PATCH 4.4 16/23] nilfs2: fix NULL pointer in nilfs_##name##_attr_release Greg Kroah-Hartman
2021-09-24 12:43 ` [PATCH 4.4 17/23] nilfs2: fix memory leak in nilfs_sysfs_create_##name##_group Greg Kroah-Hartman
2021-09-24 12:43 ` [PATCH 4.4 18/23] nilfs2: fix memory leak in nilfs_sysfs_delete_##name##_group Greg Kroah-Hartman
2021-09-24 12:44 ` [PATCH 4.4 19/23] nilfs2: fix memory leak in nilfs_sysfs_create_snapshot_group Greg Kroah-Hartman
2021-09-24 12:44 ` [PATCH 4.4 20/23] nilfs2: fix memory leak in nilfs_sysfs_delete_snapshot_group Greg Kroah-Hartman
2021-09-24 12:44 ` Greg Kroah-Hartman [this message]
2021-09-24 12:44 ` [PATCH 4.4 22/23] drm/nouveau/nvkm: Replace -ENOSYS with -ENODEV Greg Kroah-Hartman
2021-09-24 12:44 ` [PATCH 4.4 23/23] sctp: validate from_addr_param return Greg Kroah-Hartman
2021-09-24 13:50 ` [PATCH 4.4 00/23] 4.4.285-rc1 review Daniel Díaz
2021-09-25 11:45   ` Greg Kroah-Hartman
2021-09-24 17:50 ` Jon Hunter
2021-09-24 21:50 ` Pavel Machek
2021-09-24 21:55 ` Shuah Khan

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210924124328.509226388@linuxfoundation.org \
    --to=gregkh@linuxfoundation.org \
    --cc=axboe@kernel.dk \
    --cc=lijinlin3@huawei.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=sashal@kernel.org \
    --cc=stable@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).