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Date:   Tue, 25 Jan 2022 13:33:19 -0600
From:   "Gustavo A. R. Silva" <>
To:     Simon Horman <>,
        Jakub Kicinski <>,
        "David S. Miller" <>
        "Gustavo A. R. Silva" <>,
Subject: [PATCH][next] nfp: flower: Use struct_size() helper in kmalloc()

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/netronome/nfp/flower/tunnel_conf.c:359:25: warning: using sizeof on a flexible structure

Signed-off-by: Gustavo A. R. Silva <>
 drivers/net/ethernet/netronome/nfp/flower/tunnel_conf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/netronome/nfp/flower/tunnel_conf.c b/drivers/net/ethernet/netronome/nfp/flower/tunnel_conf.c
index dfb4468fe287..ce865e619568 100644
--- a/drivers/net/ethernet/netronome/nfp/flower/tunnel_conf.c
+++ b/drivers/net/ethernet/netronome/nfp/flower/tunnel_conf.c
@@ -356,7 +356,7 @@ __nfp_tun_add_route_to_cache(struct list_head *route_list,
 			return 0;
-	entry = kmalloc(sizeof(*entry) + add_len, GFP_ATOMIC);
+	entry = kmalloc(struct_size(entry, ip_add, add_len), GFP_ATOMIC);
 	if (!entry) {
 		return -ENOMEM;

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