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Message-ID: <20240911141658.GA632894@bhelgaas>
Date: Wed, 11 Sep 2024 09:16:58 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Qianqiang Liu <qianqiang.liu@....com>
Cc: hongxing.zhu@....com, l.stach@...gutronix.de, shawnguo@...nel.org,
s.hauer@...gutronix.de, linux-pci@...r.kernel.org,
imx@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: imx6: Fix a "Null pointer dereference" issue
On Wed, Sep 11, 2024 at 08:50:57PM +0800, Qianqiang Liu wrote:
> The "resource_list_first_type" function may return NULL, which
> will make "entry->offset" dereferences a NULL pointer.
>
> Signed-off-by: Qianqiang Liu <qianqiang.liu@....com>
> ---
> drivers/pci/controller/dwc/pci-imx6.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
> index 0dbc333adcff..04e90ba4e7d6 100644
> --- a/drivers/pci/controller/dwc/pci-imx6.c
> +++ b/drivers/pci/controller/dwc/pci-imx6.c
> @@ -1017,13 +1017,14 @@ static u64 imx_pcie_cpu_addr_fixup(struct dw_pcie *pcie, u64 cpu_addr)
> struct imx_pcie *imx_pcie = to_imx_pcie(pcie);
> struct dw_pcie_rp *pp = &pcie->pp;
> struct resource_entry *entry;
> - unsigned int offset;
> + unsigned int offset = 0;
>
> if (!(imx_pcie->drvdata->flags & IMX_PCIE_FLAG_CPU_ADDR_FIXUP))
> return cpu_addr;
>
> entry = resource_list_first_type(&pp->bridge->windows, IORESOURCE_MEM);
> - offset = entry->offset;
> + if (entry)
> + offset = entry->offset;
>
> return (cpu_addr - offset);
> }
I made the edit I proposed here:
https://lore.kernel.org/r/20240911140721.GA630378@bhelgaas
Please double-check it at:
https://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git/commit/?id=c2699778e6be
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