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authorUrsula Braun <ubraun@linux.vnet.ibm.com>2017-09-21 09:16:28 +0200
committerDavid S. Miller <davem@davemloft.net>2017-09-21 15:31:02 -0700
commit731b008560e6dfaf5fb297543f17bbe9bb868f3c (patch)
treea7e7c54a74dd43ae46fd8e3e349676db8089a3f2 /net/smc
parent846e344eb7229018457d6d6fc1ab0cc0a167692f (diff)
downloadlinux-731b008560e6dfaf5fb297543f17bbe9bb868f3c.tar.bz2
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: Ursula Braun <ubraun@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/smc')
-rw-r--r--net/smc/af_smc.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index 8c6d24b2995d..2e8d2dabac0c 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -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);