Re: [PATCH] RDMA/irdma: Check for null udata during reg_user_mr

[Leon Romanovsky <leon@kernel.org>]

On Tue, Jun 30, 2026 at 03:47:19PM +0000, Jacob Moroni wrote:
> The irdma driver requires udata for reg_user_mr. Previously,
> it was assuming that it was always non-null, but it can actually
> be null if the user intentionally triggers the UVERBS_METHOD_REG_MR
> ioctl.
> 
> Signed-off-by: Jacob Moroni <jmoroni@google.com>
> ---
>  drivers/infiniband/hw/irdma/verbs.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/infiniband/hw/irdma/verbs.c b/drivers/infiniband/hw/irdma/verbs.c
> index cb54c7c8fcd..3bcac68a612 100644
> --- a/drivers/infiniband/hw/irdma/verbs.c
> +++ b/drivers/infiniband/hw/irdma/verbs.c
> @@ -3519,6 +3519,9 @@ static struct ib_mr *irdma_reg_user_mr(struct ib_pd *pd, u64 start, u64 len,
>  	if (dmah)
>  		return ERR_PTR(-EOPNOTSUPP);
>  
> +	if (!udata)
> +		return ERR_PTR(-EINVAL);

Is this check specific to iRDMA?

Thanks

> +
>  	if (len > iwdev->rf->sc_dev.hw_attrs.max_mr_size)
>  		return ERR_PTR(-EINVAL);
>  
> -- 
> 2.55.0.rc0.799.gd6f94ed593-goog
>