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Commit 731b0085 authored by Ursula Braun's avatar Ursula Braun Committed by David S. Miller
Browse files

net/smc: take RCU read lock for routing cache lookup 



smc_netinfo_by_tcpsk() looks up the routing cache. Such a lookup requires
protection by an RCU read lock.

Signed-off-by: default avatarUrsula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 846e344e

net/smc/af_smc.c

+7 −3
Original line number Diff line number Diff line
@@ -282,6 +282,7 @@ int smc_netinfo_by_tcpsk(struct socket *clcsock, 
			 __be32 *subnet, u8 *prefix_len)

{

	struct dst_entry *dst = sk_dst_get(clcsock->sk);

	struct in_device *in_dev;

	struct sockaddr_in addr;

	int rc = -ENOENT;

	int len;
@@ -298,14 +299,17 @@ int smc_netinfo_by_tcpsk(struct socket *clcsock, 
	/* get address to which the internal TCP socket is bound */

	kernel_getsockname(clcsock, (struct sockaddr *)&addr, &len);

	/* analyze IPv4 specific data of net_device belonging to TCP socket */

	for_ifa(dst->dev->ip_ptr) {

		if (ifa->ifa_address != addr.sin_addr.s_addr)

	rcu_read_lock();

	in_dev = __in_dev_get_rcu(dst->dev);

	for_ifa(in_dev) {

		if (!inet_ifa_match(addr.sin_addr.s_addr, ifa))

			continue;

		*prefix_len = inet_mask_len(ifa->ifa_mask);

		*subnet = ifa->ifa_address & ifa->ifa_mask;

		rc = 0;

		break;

	} endfor_ifa(dst->dev->ip_ptr);

	} endfor_ifa(in_dev);

	rcu_read_unlock();



out_rel:

	dst_release(dst);