1 files changed, 1 insertions, 2 deletions

diff --git a/net/dsa/dsa2.c b/net/dsa/dsa2.c
index 410f19148106..c00ee464afc7 100644
--- a/net/dsa/dsa2.c
+++ b/net/dsa/dsa2.c
@@ -771,11 +771,10 @@ static int dsa_switch_probe(struct dsa_switch *ds)
 
 struct dsa_switch *dsa_switch_alloc(struct device *dev, size_t n)
 {
-        size_t size = sizeof(struct dsa_switch) + n * sizeof(struct dsa_port);
         struct dsa_switch *ds;
         int i;
 
-        ds = devm_kzalloc(dev, size, GFP_KERNEL);
+        ds = devm_kzalloc(dev, struct_size(ds, ports, n), GFP_KERNEL);
         if (!ds)
                 return NULL;