Re: [Patch v6 7/9] PCI: tegra194: Fix possible array out of bounds access

[Lorenzo Pieralisi <lpieralisi@kernel.org>]

On Tue, Apr 11, 2023 at 04:30:00PM +0530, Sumit Gupta wrote:
> Add check to fix the possible array out of bounds violation by
> making speed equal to GEN1_CORE_CLK_FREQ when its value is more
> than the size of "pcie_gen_freq" array. This array has size of
> four but possible speed (CLS) values are from "0 to 0xF". So,
> "speed - 1" values are "-1 to 0xE". This change was suggested by
> "Bjorn Helgaas" in the below link.

There is a Suggested-by tag and a Link: tag remove the last
sentence, that's duplicate information.

> Suggested-by: Bjorn Helgaas <helgaas@kernel.org>
> Signed-off-by: Sumit Gupta <sumitg@nvidia.com>
> Link: https://lore.kernel.org/lkml/72b9168b-d4d6-4312-32ea-69358df2f2d0@nvidia.com/
> ---
>  drivers/pci/controller/dwc/pcie-tegra194.c | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)

Acked-by: Lorenzo Pieralisi <lpieralisi@kernel.org>

> diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
> index 09825b4a075e..e6eec85480ca 100644
> --- a/drivers/pci/controller/dwc/pcie-tegra194.c
> +++ b/drivers/pci/controller/dwc/pcie-tegra194.c
> @@ -223,6 +223,7 @@
>  #define EP_STATE_ENABLED	1
>  
>  static const unsigned int pcie_gen_freq[] = {
> +	GEN1_CORE_CLK_FREQ,	/* PCI_EXP_LNKSTA_CLS == 0; undefined */
>  	GEN1_CORE_CLK_FREQ,
>  	GEN2_CORE_CLK_FREQ,
>  	GEN3_CORE_CLK_FREQ,
> @@ -459,7 +460,11 @@ static irqreturn_t tegra_pcie_ep_irq_thread(int irq, void *arg)
>  
>  	speed = dw_pcie_readw_dbi(pci, pcie->pcie_cap_base + PCI_EXP_LNKSTA) &
>  		PCI_EXP_LNKSTA_CLS;
> -	clk_set_rate(pcie->core_clk, pcie_gen_freq[speed - 1]);
> +
> +	if (speed >= ARRAY_SIZE(pcie_gen_freq))
> +		speed = 0;
> +
> +	clk_set_rate(pcie->core_clk, pcie_gen_freq[speed]);
>  
>  	if (pcie->of_data->has_ltr_req_fix)
>  		return IRQ_HANDLED;
> @@ -1020,7 +1025,11 @@ static int tegra_pcie_dw_start_link(struct dw_pcie *pci)
>  
>  	speed = dw_pcie_readw_dbi(pci, pcie->pcie_cap_base + PCI_EXP_LNKSTA) &
>  		PCI_EXP_LNKSTA_CLS;
> -	clk_set_rate(pcie->core_clk, pcie_gen_freq[speed - 1]);
> +
> +	if (speed >= ARRAY_SIZE(pcie_gen_freq))
> +		speed = 0;
> +
> +	clk_set_rate(pcie->core_clk, pcie_gen_freq[speed]);
>  
>  	tegra_pcie_enable_interrupts(pp);
>  
> -- 
> 2.17.1
>