linux-hardening - Re: [PATCH] iommufd/driver: Fix counter initialization for counted

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Message-ID: <aROGRiysoG5ufXeI@Asurada-Nvidia>
Date: Tue, 11 Nov 2025 10:53:58 -0800
From: Nicolin Chen <nicolinc@...dia.com>
To: "Gustavo A. R. Silva" <gustavoars@...nel.org>
CC: Jason Gunthorpe <jgg@...pe.ca>, Kevin Tian <kevin.tian@...el.com>, "Joerg
 Roedel" <joro@...tes.org>, Will Deacon <will@...nel.org>, Robin Murphy
	<robin.murphy@....com>, Lu Baolu <baolu.lu@...ux.intel.com>,
	<iommu@...ts.linux.dev>, <linux-kernel@...r.kernel.org>,
	<linux-hardening@...r.kernel.org>
Subject: Re: [PATCH] iommufd/driver: Fix counter initialization for
 counted_by annotation

On Tue, Nov 11, 2025 at 06:01:24PM +0900, Gustavo A. R. Silva wrote:
> One of the requirements for counted_by annotations is that the counter
> member must be initialized before the first reference to the
> flexible-array member.
> 
> Move the vevent->data_len = data_len; initialization to before the
> first access to flexible array vevent->event_data.
> 
> Cc: stable@...r.kernel.org
> Fixes: e8e1ef9b77a7 ("iommufd/viommu: Add iommufd_viommu_report_event helper")
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
 
Reviewed-by: Nicolin Chen <nicolinc@...dia.com>