linux-kernel - Re: [PATCH] iommufd: viommu: free memory allocated by kvcalloc() using kvfree()

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Message-ID: <20250818141429.GM802098@nvidia.com>
Date: Mon, 18 Aug 2025 11:14:29 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Akhilesh Patil <akhilesh@...iitb.ac.in>
Cc: kevin.tian@...el.com, joro@...tes.org, will@...nel.org,
	robin.murphy@....com, praan@...gle.com, baolu.lu@...ux.intel.com,
	nicolinc@...dia.com, iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org, akhileshpatilvnit@...il.com,
	skhan@...uxfoundation.org
Subject: Re: [PATCH] iommufd: viommu: free memory allocated by kvcalloc()
 using kvfree()

On Sun, Aug 10, 2025 at 07:04:01PM +0530, Akhilesh Patil wrote:
> Use kvfree() instead of kfree() to free pages allocated by kvcalloc()
> in iommufs_hw_queue_alloc_phys() to fix potential memory corruption.
> Ensure the memory is properly freed, as kvcalloc may internally use
> vmalloc or kmalloc depending on available memory in the system.
> 
> Fixes: 2238ddc2b056 ("iommufd/viommu: Add IOMMUFD_CMD_HW_QUEUE_ALLOC ioctl")
> Signed-off-by: Akhilesh Patil <akhilesh@...iitb.ac.in>
> ---
>  drivers/iommu/iommufd/viommu.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

Applied to for-rc

Thanks,
Jason