linux-kernel - [PATCH] drivers/iommu: use struct

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Date:   Wed, 16 Feb 2022 03:09:16 +0000
From:   cgel.zte@...il.com
To:     jean-philippe@...aro.org
Cc:     joro@...tes.org, will@...nel.org,
        virtualization@...ts.linux-foundation.org,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Minghao Chi <chi.minghao@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: [PATCH] drivers/iommu: use struct_size over open coded arithmetic

From: Minghao Chi (CGEL ZTE) <chi.minghao@....com.cn>

Replace zero-length array with flexible-array member and make use
of the struct_size() helper in kzalloc(). For example:

struct viommu_request {
	...
	unsigned int			len;
	char				buf[];
};

Make use of the struct_size() helper instead of an open-coded version
in order to avoid any potential type mistakes.

Reported-by: Zeal Robot <zealci@....com.cn>
Signed-off-by: Minghao Chi (CGEL ZTE) <chi.minghao@....com.cn>
---
 drivers/iommu/virtio-iommu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/virtio-iommu.c b/drivers/iommu/virtio-iommu.c
index f2aa34f57454..0996d9c7c358 100644
--- a/drivers/iommu/virtio-iommu.c
+++ b/drivers/iommu/virtio-iommu.c
@@ -231,7 +231,7 @@ static int __viommu_add_req(struct viommu_dev *viommu, void *buf, size_t len,
 	if (write_offset <= 0)
 		return -EINVAL;
 
-	req = kzalloc(sizeof(*req) + len, GFP_ATOMIC);
+	req = kzalloc(struct_size(req, buf, len), GFP_ATOMIC);
 	if (!req)
 		return -ENOMEM;
 
-- 
2.25.1