Merge branch 'cxgb3-undefined-behaviour-and-use-struct_size'

Gustavo A. R. Silva says:

====================
cxgb3/l2t: Fix undefined behaviour and use struct_size() helper

This patchset aims to fix an undefined behaviour when using a zero-sized
array and, add the use of the struct_size() helper in kvzalloc().

You might consider the first patch in this series for stable.

More details in the commit logs.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/chelsio/cxgb3/l2t.c

@@ -443,9 +443,9 @@ void t3_l2t_update(struct t3cdev *dev, struct neighbour *neigh)
 struct l2t_data *t3_init_l2t(unsigned int l2t_capacity)
 {
 	struct l2t_data *d;
-	int i, size = sizeof(*d) + l2t_capacity * sizeof(struct l2t_entry);
+	int i;
 
-	d = kvzalloc(size, GFP_KERNEL);
+	d = kvzalloc(struct_size(d, l2tab, l2t_capacity), GFP_KERNEL);
 	if (!d)
 		return NULL;
 

drivers/net/ethernet/chelsio/cxgb3/l2t.h

@@ -75,8 +75,8 @@ struct l2t_data {
 	struct l2t_entry *rover;	/* starting point for next allocation */
 	atomic_t nfree;		/* number of free entries */
 	rwlock_t lock;
-	struct l2t_entry l2tab[0];
 	struct rcu_head rcu_head;	/* to handle rcu cleanup */
+	struct l2t_entry l2tab[];
 };
 
 typedef void (*arp_failure_handler_func)(struct t3cdev * dev,