SCTP: IPv4 mapped addr not returned in SCTPv6 accept()

When issuing a connect call on an AF_INET6 sctp socket with
a IPv4-mapped destination, the peer address that is returned
by getpeeraddr() should be v4-mapped as well.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>

1 files changed, 11 insertions, 9 deletions

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index be743d4a7c09..01c6364245b7 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -975,7 +975,7 @@ static int __sctp_connect(struct sock* sk,
         int err = 0;
         int addrcnt = 0;
         int walk_size = 0;
-        union sctp_addr *sa_addr;
+        union sctp_addr *sa_addr = NULL;
         void *addr_buf;
         unsigned short port;
         unsigned int f_flags = 0;
@@ -1009,7 +1009,10 @@ static int __sctp_connect(struct sock* sk,
                         goto out_free;
                 }
 
-                err = sctp_verify_addr(sk, sa_addr, af->sockaddr_len);
+                /* Save current address so we can work with it */
+                memcpy(&to, sa_addr, af->sockaddr_len);
+
+                err = sctp_verify_addr(sk, &to, af->sockaddr_len);
                 if (err)
                         goto out_free;
 
@@ -1019,12 +1022,11 @@ static int __sctp_connect(struct sock* sk,
                 if (asoc && asoc->peer.port && asoc->peer.port != port)
                         goto out_free;
 
-                memcpy(&to, sa_addr, af->sockaddr_len);
 
                 /* Check if there already is a matching association on the
                  * endpoint (other than the one created here).
                  */
-                asoc2 = sctp_endpoint_lookup_assoc(ep, sa_addr, &transport);
+                asoc2 = sctp_endpoint_lookup_assoc(ep, &to, &transport);
                 if (asoc2 && asoc2 != asoc) {
                         if (asoc2->state >= SCTP_STATE_ESTABLISHED)
                                 err = -EISCONN;
@@ -1037,7 +1039,7 @@ static int __sctp_connect(struct sock* sk,
                  * make sure that there is no peeled-off association matching
                  * the peer address even on another socket.
                  */
-                if (sctp_endpoint_is_peeled_off(ep, sa_addr)) {
+                if (sctp_endpoint_is_peeled_off(ep, &to)) {
                         err = -EADDRNOTAVAIL;
                         goto out_free;
                 }
@@ -1068,7 +1070,7 @@ static int __sctp_connect(struct sock* sk,
                                 }
                         }
 
-                        scope = sctp_scope(sa_addr);
+                        scope = sctp_scope(&to);
                         asoc = sctp_association_new(ep, sk, scope, GFP_KERNEL);
                         if (!asoc) {
                                 err = -ENOMEM;
@@ -1077,7 +1079,7 @@ static int __sctp_connect(struct sock* sk,
                 }
 
                 /* Prime the peer's transport structures.  */
-                transport = sctp_assoc_add_peer(asoc, sa_addr, GFP_KERNEL,
+                transport = sctp_assoc_add_peer(asoc, &to, GFP_KERNEL,
                                                 SCTP_UNKNOWN);
                 if (!transport) {
                         err = -ENOMEM;
@@ -1101,8 +1103,8 @@ static int __sctp_connect(struct sock* sk,
 
         /* Initialize sk's dport and daddr for getpeername() */
         inet_sk(sk)->dport = htons(asoc->peer.port);
-        af = sctp_get_af_specific(to.sa.sa_family);
-        af->to_sk_daddr(&to, sk);
+        af = sctp_get_af_specific(sa_addr->sa.sa_family);
+        af->to_sk_daddr(sa_addr, sk);
         sk->sk_err = 0;
 
         /* in-kernel sockets don't generally have a file allocated to them