[PATCH -next v2] i3c: master: svc: drop free_irq of devm_request_irq allocated irq

[PATCH -next v2] i3c: master: svc: drop free_irq of devm_request_irq allocated irq

[Yang Yingliang]

irq allocated with devm_request_irq() will be freed in devm_irq_release(),
using free_irq() in ->remove() will causes a dangling pointer, and a
subsequent double free. So remove the free_irq() in svc_i3c_master_remove().

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
---
v2:
  removing free_irq() instead of using devm_free_irq()
---
 drivers/i3c/master/svc-i3c-master.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c
index 1f6ba4221817..eeb49b5d90ef 100644
--- a/drivers/i3c/master/svc-i3c-master.c
+++ b/drivers/i3c/master/svc-i3c-master.c
@@ -1448,7 +1448,6 @@ static int svc_i3c_master_remove(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	free_irq(master->irq, master);
 	clk_disable_unprepare(master->pclk);
 	clk_disable_unprepare(master->fclk);
 	clk_disable_unprepare(master->sclk);
-- 
2.25.1


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Re: [PATCH -next v2] i3c: master: svc: drop free_irq of devm_request_irq allocated irq

[Miquel Raynal]

Hello,

Yang Yingliang <yangyingliang@huawei.com> wrote on Wed, 2 Jun 2021
16:49:35 +0800:

> irq allocated with devm_request_irq() will be freed in devm_irq_release(),
> using free_irq() in ->remove() will causes a dangling pointer, and a
> subsequent double free. So remove the free_irq() in svc_i3c_master_remove().
> 
> Reported-by: Hulk Robot <hulkci@huawei.com>
> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>

Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>

Thanks,
Miquèl

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Re: [PATCH -next v2] i3c: master: svc: drop free_irq of devm_request_irq allocated irq

[Alexandre Belloni]

On Wed, 2 Jun 2021 16:49:35 +0800, Yang Yingliang wrote:
> irq allocated with devm_request_irq() will be freed in devm_irq_release(),
> using free_irq() in ->remove() will causes a dangling pointer, and a
> subsequent double free. So remove the free_irq() in svc_i3c_master_remove().

Applied, thanks!

[1/1] i3c: master: svc: drop free_irq of devm_request_irq allocated irq
      commit: 59a61e69c4252b4e8ecd15e752b0d2337f0121b7

Best regards,
-- 
Alexandre Belloni <alexandre.belloni@bootlin.com>

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