[IPV6]: Handle np->opt being NULL in ipv6_getsockopt_sticky().

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 3 deletions

diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 286c86735aed..4e0561a082d0 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -795,11 +795,15 @@ int compat_ipv6_setsockopt(struct sock *sk, int level, int optname,
 EXPORT_SYMBOL(compat_ipv6_setsockopt);
 #endif
 
-static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_opt_hdr *hdr,
+static int ipv6_getsockopt_sticky(struct sock *sk, struct ipv6_txoptions *opt,
                                   char __user *optval, int len)
 {
-        if (!hdr)
+        struct ipv6_opt_hdr *hdr;
+
+        if (!opt || !opt->hopopt)
                 return 0;
+        hdr = opt->hopopt;
+
         len = min_t(int, len, ipv6_optlen(hdr));
         if (copy_to_user(optval, hdr, ipv6_optlen(hdr)))
                 return -EFAULT;
@@ -940,7 +944,7 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
         {
 
                 lock_sock(sk);
-                len = ipv6_getsockopt_sticky(sk, np->opt->hopopt,
+                len = ipv6_getsockopt_sticky(sk, np->opt,
                                              optval, len);
                 release_sock(sk);
                 return put_user(len, optlen);