diff options
| author | Ursula Braun <ubraun@linux.vnet.ibm.com> | 2017-09-21 09:16:28 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-09-21 15:31:02 -0700 |
| commit | 731b008560e6dfaf5fb297543f17bbe9bb868f3c (patch) | |
| tree | a7e7c54a74dd43ae46fd8e3e349676db8089a3f2 /net | |
| parent | 846e344eb7229018457d6d6fc1ab0cc0a167692f (diff) | |
| download | linux-0-day-731b008560e6dfaf5fb297543f17bbe9bb868f3c.tar.gz linux-0-day-731b008560e6dfaf5fb297543f17bbe9bb868f3c.tar.xz | |
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')
| -rw-r--r-- | net/smc/af_smc.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c index 8c6d24b2995dd..2e8d2dabac0ca 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); |