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Thu, 21 May 2026 17:36:40 -0700 From: Nicolin Chen To: , CC: , , Subject: [PATCH rc v2 1/4] iommufd: Fix data_len byte-count vs element-count mismatch Date: Thu, 21 May 2026 17:36:32 -0700 Message-ID: X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1PEPF000075F0:EE_|IA1PR12MB6017:EE_ X-MS-Office365-Filtering-Correlation-Id: bc64ad77-a816-4858-9bca-08deb79a3ae1 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|82310400026|36860700016|376014|11063799006|22082099003|18002099003|56012099003; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230040)(1800799024)(82310400026)(36860700016)(376014)(11063799006)(22082099003)(18002099003)(56012099003);DIR:OUT;SFP:1101; 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With event_data typed as u64, data_len is interpreted as a u64 element count. Yet, every caller and the read path treat data_len as a byte count. The current code over-allocates by sizeof(u64) and the __counted_by() annotation overstates the length by the same factor. Re-type event_data as u8. No functional change in user-visible behavior. Fixes: e36ba5ab808e ("iommufd: Add IOMMUFD_OBJ_VEVENTQ and IOMMUFD_CMD_VEVENTQ_ALLOC") Cc: stable@vger.kernel.org Reviewed-by: Jason Gunthorpe Signed-off-by: Nicolin Chen --- drivers/iommu/iommufd/iommufd_private.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/iommu/iommufd/iommufd_private.h b/drivers/iommu/iommufd/iommufd_private.h index 6ac1965199e9a..43fbc5bed8de3 100644 --- a/drivers/iommu/iommufd/iommufd_private.h +++ b/drivers/iommu/iommufd/iommufd_private.h @@ -602,7 +602,7 @@ struct iommufd_vevent { struct iommufd_vevent_header header; struct list_head node; /* for iommufd_eventq::deliver */ ssize_t data_len; - u64 event_data[] __counted_by(data_len); + u8 event_data[] __counted_by(data_len); }; #define vevent_for_lost_events_header(vevent) \ -- 2.43.0