Re: [PATCH] scsi: mpt3sas: avoid out-of-bounds cpumask_of_node() call in _base_assign_reply_queues()

[Johannes Thumshirn]

On Mon, Aug 17, 2026 at 04:13:00PM -0600, Ivy Lopez wrote:
> dev_to_node() can return NUMA_NO_NODE (-1) on systems without NUMA
> topology information for the PCI device, such as single-socket
> boards that don't expose device-to-node affinity. Passing -1
> directly into cpumask_of_node() indexes node_to_cpumask_map[-1],
> an out-of-bounds array read caught by UBSAN:
> 
>   UBSAN: array-index-out-of-bounds in arch/x86/include/asm/topology.h:72:28
>   index -1 is out of range for type 'cpumask *[1024]'
> 
> Fall back to cpu_online_mask when no NUMA node is available, rather
> than assuming dev_to_node() always returns a valid node index.
> 
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=221294
> Signed-off-by: Ivy Lopez <skunkolee@xxxxxxxxx>
> ---
>  drivers/scsi/mpt3sas/mpt3sas_base.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c b/drivers/scsi/mpt3sas/mpt3sas_base.c
> index 79052f2accbd..eaad6fb7f3cf 100644
> --- a/drivers/scsi/mpt3sas/mpt3sas_base.c
> +++ b/drivers/scsi/mpt3sas/mpt3sas_base.c
> @@ -3238,7 +3238,9 @@ _base_assign_reply_queues(struct MPT3SAS_ADAPTER *ioc)
>  		 * corresponding to high iops queues.
>  		 */
>  		if (ioc->high_iops_queues) {
> -			mask = cpumask_of_node(dev_to_node(&ioc->pdev->dev));
> +			int node = (dev_to_node(&ioc->pdev->dev));

Why the superfluous parenthesis?

> +
> +			mask = (node == NUMA_NO_NODE) ? cpu_online_mask : cpumask_of_node(node);

Overly long line here.

>  			for (index = 0; index < ioc->high_iops_queues;
>  			    index++) {
>  				irq = pci_irq_vector(ioc->pdev, index);
> -- 
> 2.55.0
> 
>