From: Robin Murphy <robin.murphy@arm.com>
To: Dan Carpenter <dan.carpenter@oracle.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Simon Xue <xxm@rock-chips.com>
Cc: "Rob Herring" <robh@kernel.org>,
"Krzysztof Wilczyński" <kw@linux.com>,
"Bjorn Helgaas" <bhelgaas@google.com>,
"Heiko Stuebner" <heiko@sntech.de>,
"Liam Girdwood" <lgirdwood@gmail.com>,
"Mark Brown" <broonie@kernel.org>,
"Kever Yang" <kever.yang@rock-chips.com>,
"Shawn Lin" <shawn.lin@rock-chips.com>,
linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-rockchip@lists.infradead.org,
kernel-janitors@vger.kernel.org
Subject: Re: [PATCH] PCI: rockchip-dwc: Potential error pointer dereference in probe
Date: Fri, 13 Aug 2021 13:55:38 +0100 [thread overview]
Message-ID: <01b7c3da-1c58-c1d9-6a54-0ce30ca76097@arm.com> (raw)
In-Reply-To: <20210813113338.GA30697@kili>
On 2021-08-13 12:33, Dan Carpenter wrote:
> If devm_regulator_get_optional() returns an error pointer, then we
> should return it to the user. The current code makes an exception
> for -ENODEV that will result in an error pointer dereference on the
> next line when it calls regulator_enable(). Remove the exception.
Doesn't this break the apparent intent of the regulator being optional,
though?
Robin.
> Fixes: e1229e884e19 ("PCI: rockchip-dwc: Add Rockchip RK356X host controller driver")
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> ---
> drivers/pci/controller/dwc/pcie-dw-rockchip.c | 5 ++---
> 1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pcie-dw-rockchip.c b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
> index 20cef2e06f66..2d0ffd3c4e16 100644
> --- a/drivers/pci/controller/dwc/pcie-dw-rockchip.c
> +++ b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
> @@ -225,9 +225,8 @@ static int rockchip_pcie_probe(struct platform_device *pdev)
> /* DON'T MOVE ME: must be enable before PHY init */
> rockchip->vpcie3v3 = devm_regulator_get_optional(dev, "vpcie3v3");
> if (IS_ERR(rockchip->vpcie3v3))
> - if (PTR_ERR(rockchip->vpcie3v3) != -ENODEV)
> - return dev_err_probe(dev, PTR_ERR(rockchip->vpcie3v3),
> - "failed to get vpcie3v3 regulator\n");
> + return dev_err_probe(dev, PTR_ERR(rockchip->vpcie3v3),
> + "failed to get vpcie3v3 regulator\n");
>
> ret = regulator_enable(rockchip->vpcie3v3);
> if (ret) {
>
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next prev parent reply other threads:[~2021-08-13 12:56 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-13 11:33 [PATCH] PCI: rockchip-dwc: Potential error pointer dereference in probe Dan Carpenter
2021-08-13 12:55 ` Robin Murphy [this message]
2021-08-13 13:34 ` Rob Herring
2021-08-13 13:47 ` Robin Murphy
2021-08-13 15:57 ` Rob Herring
2021-08-13 16:01 ` Mark Brown
2021-08-13 13:54 ` Dan Carpenter
2021-08-13 14:01 ` Robin Murphy
2021-08-13 14:12 ` Dan Carpenter
2021-08-13 14:26 ` [PATCH v2] " Dan Carpenter
2021-08-23 16:15 ` Lorenzo Pieralisi
2021-08-13 14:32 ` [PATCH] " Mark Brown
2021-08-13 15:00 ` Robin Murphy
2021-08-13 15:30 ` Mark Brown
2021-08-13 15:45 ` Dan Carpenter
2021-08-13 15:53 ` Mark Brown
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