From: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
To: Dan Carpenter <dan.carpenter@oracle.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>,
"Shawn Lin" <shawn.lin@rock-chips.com>,
"Kever Yang" <kever.yang@rock-chips.com>,
"Simon Xue" <xxm@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 v2] PCI: rockchip-dwc: Potential error pointer dereference in probe
Date: Mon, 23 Aug 2021 17:15:27 +0100 [thread overview]
Message-ID: <20210823161527.GA8289@lpieralisi> (raw)
In-Reply-To: <20210813142648.GA12057@kili>
On Fri, Aug 13, 2021 at 05:26:48PM +0300, Dan Carpenter wrote:
> If devm_regulator_get_optional() returns -ENODEV then it would lead
> to an error pointer dereference on the next line and in the error
> handling code.
>
> Fixes: e1229e884e19 ("PCI: rockchip-dwc: Add Rockchip RK356X host controller driver")
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> ---
> v2: The -ENODEV from devm_regulator_get_optional() has to be handled
> specially.
>
> drivers/pci/controller/dwc/pcie-dw-rockchip.c | 17 ++++++++++-------
> 1 file changed, 10 insertions(+), 7 deletions(-)
I squashed it in with the patch that is fixing, thanks a lot.
Lorenzo
> diff --git a/drivers/pci/controller/dwc/pcie-dw-rockchip.c b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
> index 20cef2e06f66..c9b341e55cbb 100644
> --- a/drivers/pci/controller/dwc/pcie-dw-rockchip.c
> +++ b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
> @@ -224,15 +224,17 @@ 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 (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");
> -
> - ret = regulator_enable(rockchip->vpcie3v3);
> - if (ret) {
> - dev_err(dev, "failed to enable vpcie3v3 regulator\n");
> - return ret;
> + rockchip->vpcie3v3 = NULL;
> + } else {
> + ret = regulator_enable(rockchip->vpcie3v3);
> + if (ret) {
> + dev_err(dev, "failed to enable vpcie3v3 regulator\n");
> + return ret;
> + }
> }
>
> ret = rockchip_pcie_phy_init(rockchip);
> @@ -255,7 +257,8 @@ static int rockchip_pcie_probe(struct platform_device *pdev)
> deinit_phy:
> rockchip_pcie_phy_deinit(rockchip);
> disable_regulator:
> - regulator_disable(rockchip->vpcie3v3);
> + if (rockchip->vpcie3v3)
> + regulator_disable(rockchip->vpcie3v3);
>
> return ret;
> }
> --
> 2.20.1
>
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next prev parent reply other threads:[~2021-08-23 16:17 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
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 [this message]
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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