Fix memory leak: free session data

Call scp_session_destroy() in the functions that call
scp_session_create() and nowhere else.

As found by Valgrind, the session data is not freed if the session is
created successfully.

sesman/libscp/libscp_v1s.c

@@ -330,7 +330,6 @@ scp_v1s_request_password(struct SCP_CONNECTION *c, struct SCP_SESSION *s,
 
     if (0 != scp_session_set_username(s, buf))
     {
-        scp_session_destroy(s);
         log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: internal error", __LINE__);
         return SCP_SERVER_STATE_INTERNAL_ERR;
     }
@@ -342,7 +341,6 @@ scp_v1s_request_password(struct SCP_CONNECTION *c, struct SCP_SESSION *s,
 
     if (0 != scp_session_set_password(s, buf))
     {
-        scp_session_destroy(s);
         log_message(LOG_LEVEL_WARNING, "[v1s:%d] connection aborted: internal error", __LINE__);
         return SCP_SERVER_STATE_INTERNAL_ERR;
     }

sesman/scp.c

@@ -36,7 +36,7 @@ void *DEFAULT_CC
 scp_process_start(void *sck)
 {
     struct SCP_CONNECTION scon;
-    struct SCP_SESSION *sdata;
+    struct SCP_SESSION *sdata = NULL;
 
     scon.in_sck = (int)(tintptr)sck;
     LOG_DBG("started scp thread on socket %d", scon.in_sck);
@@ -89,9 +89,16 @@ scp_process_start(void *sck)
             break;
         default:
             log_message(LOG_LEVEL_ALWAYS, "unknown return from scp_vXs_accept()");
+            break;
     }
 
     free_stream(scon.in_s);
     free_stream(scon.out_s);
+
+    if (sdata)
+    {
+        scp_session_destroy(sdata);
+    }
+
     return 0;
 }

sesman/scp_v1.c

@@ -77,7 +77,6 @@ scp_v1_process(struct SCP_CONNECTION *c, struct SCP_SESSION *s)
             default:
                 /* we check the other errors */
                 parseCommonStates(e, "scp_v1s_list_sessions()");
-                scp_session_destroy(s);
                 return;
                 //break;
         }
@@ -88,7 +87,6 @@ scp_v1_process(struct SCP_CONNECTION *c, struct SCP_SESSION *s)
         scp_v1s_deny_connection(c, "Login failed");
         log_message( LOG_LEVEL_INFO,
                      "Login failed for user %s. Connection terminated", s->username);
-        scp_session_destroy(s);
         return;
     }
 
@@ -98,7 +96,6 @@ scp_v1_process(struct SCP_CONNECTION *c, struct SCP_SESSION *s)
         scp_v1s_deny_connection(c, "Access to Terminal Server not allowed.");
         log_message(LOG_LEVEL_INFO,
                     "User %s not allowed on TS. Connection terminated", s->username);
-        scp_session_destroy(s);
         return;
     }
 
@@ -204,7 +201,6 @@ scp_v1_process(struct SCP_CONNECTION *c, struct SCP_SESSION *s)
     }
 
     /* cleanup */
-    scp_session_destroy(s);
     auth_end(data);
     g_free(slist);
 }

sesman/scp_v1_mng.c

@@ -50,7 +50,6 @@ scp_v1_mng_process(struct SCP_CONNECTION *c, struct SCP_SESSION *s)
         scp_v1s_mng_deny_connection(c, "Login failed");
         log_message(LOG_LEVEL_INFO,
                     "[MNG] Login failed for user %s. Connection terminated", s->username);
-        scp_session_destroy(s);
         auth_end(data);
         return;
     }
@@ -61,7 +60,6 @@ scp_v1_mng_process(struct SCP_CONNECTION *c, struct SCP_SESSION *s)
         scp_v1s_mng_deny_connection(c, "Access to Terminal Server not allowed.");
         log_message(LOG_LEVEL_INFO,
                     "[MNG] User %s not allowed on TS. Connection terminated", s->username);
-        scp_session_destroy(s);
         auth_end(data);
         return;
     }
@@ -105,7 +103,6 @@ scp_v1_mng_process(struct SCP_CONNECTION *c, struct SCP_SESSION *s)
     }
 
     /* cleanup */
-    scp_session_destroy(s);
     auth_end(data);
 }