linux-kernel - Re: [PATCH v1] PCI: Cadence: Avoid possible signed 64-bit truncation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <racdnvit3j2plo4v3c3liz55ocbr7irofl2cgglvfltanxa54m@bebkiecxrrlj>
Date: Tue, 23 Dec 2025 21:57:15 +0530
From: Manivannan Sadhasivam <mani@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: Lorenzo Pieralisi <lpieralisi@...nel.org>, 
	Krzysztof Wilczyński <kwilczynski@...nel.org>, Rob Herring <robh@...nel.org>, 
	Bjorn Helgaas <bhelgaas@...gle.com>, Siddharth Vadapalli <s-vadapalli@...com>, 
	Kishon Vijay Abraham I <kishon@...nel.org>, Hans Zhang <18255117159@....com>, 
	Chen Wang <unicorn_wang@...look.com>, linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] PCI: Cadence: Avoid possible signed 64-bit truncation

On Tue, Dec 09, 2025 at 02:37:56PM -0800, Ian Rogers wrote:
> 64-bit truncation to 32-bit can result in the sign of the truncated
> value changing. The cdns_pcie_host_dma_ranges_cmp is used in list_sort
> and so the truncation could result in an invalid sort order. This
> would only happen were the resource_size values large.
> 
> Signed-off-by: Ian Rogers <irogers@...gle.com>

Applied to pci/controller/cadence!

- Mani

> ---
>  drivers/pci/controller/cadence/pcie-cadence-host.c | 14 +++++++++++---
>  1 file changed, 11 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/pci/controller/cadence/pcie-cadence-host.c b/drivers/pci/controller/cadence/pcie-cadence-host.c
> index fffd63d6665e..e5fd02305ab6 100644
> --- a/drivers/pci/controller/cadence/pcie-cadence-host.c
> +++ b/drivers/pci/controller/cadence/pcie-cadence-host.c
> @@ -414,11 +414,19 @@ static int cdns_pcie_host_dma_ranges_cmp(void *priv, const struct list_head *a,
>  					 const struct list_head *b)
>  {
>  	struct resource_entry *entry1, *entry2;
> +	u64 size1, size2;
>  
> -        entry1 = container_of(a, struct resource_entry, node);
> -        entry2 = container_of(b, struct resource_entry, node);
> +	entry1 = container_of(a, struct resource_entry, node);
> +	entry2 = container_of(b, struct resource_entry, node);
>  
> -        return resource_size(entry2->res) - resource_size(entry1->res);
> +	size1 = resource_size(entry1->res);
> +	size2 = resource_size(entry2->res);
> +
> +	if (size1 > size2)
> +		return -1;
> +	if (size1 < size2)
> +		return 1;
> +	return 0;
>  }
>  
>  static void cdns_pcie_host_unmap_dma_ranges(struct cdns_pcie_rc *rc)
> -- 
> 2.52.0.223.gf5cc29aaa4-goog
> 

-- 
மணிவண்ணன் சதாசிவம்