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

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

Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ursula Braun 2017-09-21 09:16:28 +02:00 committed by David S. Miller
parent 846e344eb7
commit 731b008560
1 changed files with 7 additions and 3 deletions
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10
net/smc/af_smc.c
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@ -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);