linux-kernel - Re: [PATCH][next] PCI: mediatek-gen3: Add missing null pointer check

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Date:   Fri, 30 Apr 2021 09:47:06 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Colin King <colin.king@...onical.com>,
        Ryder Lee <ryder.lee@...iatek.com>,
        Jianjun Wang <jianjun.wang@...iatek.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-pci@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] PCI: mediatek-gen3: Add missing null pointer check

Le 29/04/2021 à 13:00, Colin King a écrit :
> From: Colin Ian King <colin.king@...onical.com>
> 
> The call to platform_get_resource_byname can potentially return null, so
> add a null pointer check to avoid a null pointer dereference issue.
> 
> Addresses-Coverity: ("Dereference null return")
> Fixes: 441903d9e8f0 ("PCI: mediatek-gen3: Add MediaTek Gen3 driver for MT8192")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>   drivers/pci/controller/pcie-mediatek-gen3.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/pci/controller/pcie-mediatek-gen3.c b/drivers/pci/controller/pcie-mediatek-gen3.c
> index 20165e4a75b2..3c5b97716d40 100644
> --- a/drivers/pci/controller/pcie-mediatek-gen3.c
> +++ b/drivers/pci/controller/pcie-mediatek-gen3.c
> @@ -721,6 +721,8 @@ static int mtk_pcie_parse_port(struct mtk_pcie_port *port)
>   	int ret;
>   
>   	regs = platform_get_resource_byname(pdev, IORESOURCE_MEM, "pcie-mac");
> +	if (!regs)
> +		return -EINVAL;
>   	port->base = devm_ioremap_resource(dev, regs);
>   	if (IS_ERR(port->base)) {
>   		dev_err(dev, "failed to map register base\n");
> 

Nitpick:
    Using 'devm_platform_ioremap_resource_byname' is slightly less 
verbose and should please Coverity.


Also, which git repo are you using? On linux-next ([1)], your proposed 
patch is already part of "PCI: mediatek-gen3: Add MediaTek Gen3 driver 
for MT8192".

[1]: 
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/log/drivers/pci/controller/pcie-mediatek-gen3.c

CJ