linux-kernel - [PATCH -next] hte: fix possible use-after-free in tegra_hte_test

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Message-ID: <20220506084851.3503635-1-yangyingliang@huawei.com>
Date:   Fri, 6 May 2022 16:48:51 +0800
From:   Yang Yingliang <yangyingliang@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <linux-tegra@...r.kernel.org>
CC:     <jonathanh@...dia.com>, <thierry.reding@...il.com>,
        <dipenp@...dia.com>
Subject: [PATCH -next] hte: fix possible use-after-free in tegra_hte_test_remove()

del_timer() does not wait until the timer handler finishing.
This means that the timer handler may still be running after
the driver's remove function has finished, which would result
in a use-after-free.
Fix it by calling del_timer_sync(), which makes sure the timer
handler has finished.

Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
---
 drivers/hte/hte-tegra194-test.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hte/hte-tegra194-test.c b/drivers/hte/hte-tegra194-test.c
index bc3ab18dfdc5..f69a274a7d8d 100644
--- a/drivers/hte/hte-tegra194-test.c
+++ b/drivers/hte/hte-tegra194-test.c
@@ -220,7 +220,7 @@ static int tegra_hte_test_remove(struct platform_device *pdev)
 	free_irq(hte.gpio_in_irq, &hte);
 	gpiod_put(hte.gpio_in);
 	gpiod_put(hte.gpio_out);
-	del_timer(&hte.timer);
+	del_timer_sync(&hte.timer);
 
 	return 0;
 }
-- 
2.25.1