CIFS: Add match_port check during looking for an existing connection (try #4)

If we have a share mounted by non-standard port and try to mount another share
on the same host with standard port, we connect to the first share again -
that's wrong. This patch fixes this bug.

Signed-off-by: Pavel Shilovsky <piastryyy@gmail.com>
Reviewed-by: Jeff Layton <jlayton@samba.org>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 37 insertions, 5 deletions

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index b90c7411f4f..41f002fb4a0 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -1453,6 +1453,40 @@ srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
         }
 }
 
+/*
+ * If no port is specified in addr structure, we try to match with 445 port
+ * and if it fails - with 139 ports. It should be called only if address
+ * families of server and addr are equal.
+ */
+static bool
+match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
+{
+        unsigned short int port, *sport;
+
+        switch (addr->sa_family) {
+        case AF_INET:
+                sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
+                port = ((struct sockaddr_in *) addr)->sin_port;
+                break;
+        case AF_INET6:
+                sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
+                port = ((struct sockaddr_in6 *) addr)->sin6_port;
+                break;
+        default:
+                WARN_ON(1);
+                return false;
+        }
+
+        if (!port) {
+                port = htons(CIFS_PORT);
+                if (port == *sport)
+                        return true;
+
+                port = htons(RFC1001_PORT);
+        }
+
+        return port == *sport;
+}
 
 static bool
 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
@@ -1466,8 +1500,6 @@ match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
 
                 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
                         return false;
-                if (addr4->sin_port && addr4->sin_port != srv_addr4->sin_port)
-                        return false;
                 break;
         }
         case AF_INET6: {
@@ -1480,9 +1512,6 @@ match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
                         return false;
                 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
                         return false;
-                if (addr6->sin6_port &&
-                    addr6->sin6_port != srv_addr6->sin6_port)
-                        return false;
                 break;
         }
         default:
@@ -1555,6 +1584,9 @@ cifs_find_tcp_session(struct sockaddr *addr, struct smb_vol *vol)
                                    (struct sockaddr *)&vol->srcaddr))
                         continue;
 
+                if (!match_port(server, addr))
+                        continue;
+
                 if (!match_security(server, vol))
                         continue;