iommufd/driver: Fix counter initialization for counted_by annotation

JIRA: https://issues.redhat.com/browse/RHEL-131315

Upstream Status: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

commit ac84ff4
Author: Gustavo A. R. Silva <gustavoars@kernel.org>
Date:   Tue Nov 11 18:01:24 2025 +0900

    iommufd/driver: Fix counter initialization for counted_by annotation

    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.

    Link: https://patch.msgid.link/r/aRL7ZFFqM5bRTd2D@kspp
    Cc: stable@vger.kernel.org
    Fixes: e8e1ef9 ("iommufd/viommu: Add iommufd_viommu_report_event helper")
    Signed-off-by: "Gustavo A. R. Silva" <gustavoars@kernel.org>
    Reviewed-by: Kevin Tian <kevin.tian@intel.com>
    Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
    Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

Signed-off-by: Eder Zulian <ezulian@redhat.com>

Author: efzrh

drivers/iommu/iommufd/driver.c

@@ -161,8 +161,8 @@ int iommufd_viommu_report_event(struct iommufd_viommu *viommu,
 		vevent = &veventq->lost_events_header;
 		goto out_set_header;
 	}
-	memcpy(vevent->event_data, event_data, data_len);
 	vevent->data_len = data_len;
+	memcpy(vevent->event_data, event_data, data_len);
 	veventq->num_events++;
 
 out_set_header: