All of lore.kernel.org
 help / color / mirror / Atom feed
From: Yang Yingliang <yangyingliang@huawei.com>
To: <linux-kernel@vger.kernel.org>, <linux-tegra@vger.kernel.org>,
	<linux-usb@vger.kernel.org>
Cc: <balbi@kernel.org>, <gregkh@linuxfoundation.org>
Subject: [PATCH -next] usb: gadget: tegra-xudc: Fix possible use-after-free in tegra_xudc_remove()
Date: Wed, 7 Apr 2021 17:29:47 +0800	[thread overview]
Message-ID: <20210407092947.3271507-1-yangyingliang@huawei.com> (raw)

This driver's remove path calls cancel_delayed_work(). However, that
function does not wait until the work function finishes. This means
that the callback function may still be running after the driver's
remove function has finished, which would result in a use-after-free.

Fix by calling cancel_delayed_work_sync(), which ensures that
the work is properly cancelled, no longer running, and unable
to re-schedule itself.

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
---
 drivers/usb/gadget/udc/tegra-xudc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/udc/tegra-xudc.c b/drivers/usb/gadget/udc/tegra-xudc.c
index 580bef8eb4cb..2319c9737c2b 100644
--- a/drivers/usb/gadget/udc/tegra-xudc.c
+++ b/drivers/usb/gadget/udc/tegra-xudc.c
@@ -3883,7 +3883,7 @@ static int tegra_xudc_remove(struct platform_device *pdev)
 
 	pm_runtime_get_sync(xudc->dev);
 
-	cancel_delayed_work(&xudc->plc_reset_work);
+	cancel_delayed_work_sync(&xudc->plc_reset_work);
 	cancel_work_sync(&xudc->usb_role_sw_work);
 
 	usb_del_gadget_udc(&xudc->gadget);
-- 
2.25.1


                 reply	other threads:[~2021-04-07  9:26 UTC|newest]

Thread overview: [no followups] expand[flat|nested]  mbox.gz  Atom feed

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=20210407092947.3271507-1-yangyingliang@huawei.com \
    --to=yangyingliang@huawei.com \
    --cc=balbi@kernel.org \
    --cc=gregkh@linuxfoundation.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-tegra@vger.kernel.org \
    --cc=linux-usb@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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.