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Commit 8238ac0c authored by David S. Miller's avatar David S. Miller
Browse files

Merge branch 'tun-cleanups' 



Markus Elfring says:

====================
tun: Fine-tuning for update_filter()

A few update suggestions were taken into account
from static source code analysis.
====================

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents 4825a4e4 3b8d2a69

drivers/net/tun.c

+5 −11
Original line number Diff line number Diff line
@@ -731,14 +731,9 @@ static int update_filter(struct tap_filter *filter, void __user *arg) 
	}



	alen = ETH_ALEN * uf.count;

	addr = kmalloc(alen, GFP_KERNEL);

	if (!addr)

		return -ENOMEM;



	if (copy_from_user(addr, arg + sizeof(uf), alen)) {

		err = -EFAULT;

		goto done;

	}

	addr = memdup_user(arg + sizeof(uf), alen);

	if (IS_ERR(addr))

		return PTR_ERR(addr);



	/* The filter is updated without holding any locks. Which is

	 * perfectly safe. We disable it first and in the worst
@@ -758,7 +753,7 @@ static int update_filter(struct tap_filter *filter, void __user *arg) 
	for (; n < uf.count; n++) {

		if (!is_multicast_ether_addr(addr[n].u)) {

			err = 0; /* no filter */

			goto done;

			goto free_addr;

		}

		addr_hash_set(filter->mask, addr[n].u);

	}
@@ -774,8 +769,7 @@ static int update_filter(struct tap_filter *filter, void __user *arg) 


	/* Return the number of exact filters */

	err = nexact;



done:

free_addr:

	kfree(addr);

	return err;

}