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Date:   Mon, 24 Jan 2022 15:43:47 -0600
From:   "Gustavo A. R. Silva" <>
To:     "K. Y. Srinivasan" <>,
        Haiyang Zhang <>,
        Stephen Hemminger <>,
        Wei Liu <>, Dexuan Cui <>,
        "David S. Miller" <>,
        Jakub Kicinski <>
        "Gustavo A. R. Silva" <>,
Subject: [PATCH][next] net: mana: Use struct_size() helper in

Make use of the struct_size() helper instead of an open-coded version,
in order to avoid any potential type mistakes or integer overflows that,
in the worst scenario, could lead to heap overflows.

Also, address the following sparse warnings:
drivers/net/ethernet/microsoft/mana/gdma_main.c:677:24: warning: using sizeof on a flexible structure

Signed-off-by: Gustavo A. R. Silva <>
 drivers/net/ethernet/microsoft/mana/gdma_main.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/microsoft/mana/gdma_main.c b/drivers/net/ethernet/microsoft/mana/gdma_main.c
index 636dfef24a6c..49b85ca578b0 100644
--- a/drivers/net/ethernet/microsoft/mana/gdma_main.c
+++ b/drivers/net/ethernet/microsoft/mana/gdma_main.c
@@ -663,7 +663,7 @@ static int mana_gd_create_dma_region(struct gdma_dev *gd,
 	struct gdma_context *gc = gd->gdma_context;
 	struct hw_channel_context *hwc;
 	u32 length = gmi->length;
-	u32 req_msg_size;
+	size_t req_msg_size;
 	int err;
 	int i;
@@ -674,7 +674,7 @@ static int mana_gd_create_dma_region(struct gdma_dev *gd,
 		return -EINVAL;
 	hwc = gc->hwc.driver_data;
-	req_msg_size = sizeof(*req) + num_page * sizeof(u64);
+	req_msg_size = struct_size(req, page_addr_list, num_page);
 	if (req_msg_size > hwc->max_req_msg_size)
 		return -EINVAL;

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