[IPV4]: Fix rtm_to_ifaddr() error handling.

Return negative error value (embedded in the pointer) instead of
returning NULL.

Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 1 deletions

diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index e10794dc5f64..98a00d0edc76 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -502,8 +502,10 @@ static struct in_ifaddr *rtm_to_ifaddr(struct nlmsghdr *nlh)
                 goto errout;
 
         ifm = nlmsg_data(nlh);
-        if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL)
+        if (ifm->ifa_prefixlen > 32 || tb[IFA_LOCAL] == NULL) {
+                err = -EINVAL;
                 goto errout;
+        }
 
         dev = __dev_get_by_index(ifm->ifa_index);
         if (dev == NULL) {