[bgpd] bug #398 Bogus free on out route-map, and assert() with rsclients

2007-08-27 Paul Jakma <paul.jakma@sun.com>

	* bgp_route.c: (bgp_announce_check) Fix bug #398, slight
	  modification of Vladimir Ivanov's suggested fix - to keep
	  memory alloc conditional.
	  (bgp_process_announce_selected) Don't take struct attr as
	  argument, none of the callers need it and it needlessly
	  distances allocation from use.
	  Free the extended attr, the attr itself is on the stack.
	  Fix bad indentation.
	* bgp_attr.c: (bgp_packet_attribute) Remove incorrect assert,
	  and adjust conditional to test attr->extra, diagnosis by
	  Vladimir Ivanov in bug #398.

2007-08-27 Vladimir Ivanov <wawa@yandex-team.ru>

	* bgp_route.c: (bgp_announce_check_rsclient) copy of
	  ri->attr is no longer deep enough, due to addition of
	  attr->extra. It should use bgp_attr_dup, as
	  bgp_announce_check() does.

1 files changed, 27 insertions, 31 deletions

diff --git a/bgpd/bgp_route.c b/bgpd/bgp_route.c
index 0f4da980..9ddeca54 100644
--- a/bgpd/bgp_route.c
+++ b/bgpd/bgp_route.c
@@ -1045,20 +1045,18 @@ bgp_announce_check (struct bgp_info *ri, struct peer *peer, struct prefix *p,
       || (ri->extra && ri->extra->suppress) )
     {
       struct bgp_info info;
-      struct attr dummy_attr;
+      struct attr dummy_attr = { 0 };
       
       info.peer = peer;
       info.attr = attr;
-      
 
       /* The route reflector is not allowed to modify the attributes
 	 of the reflected IBGP routes. */
       if (peer_sort (from) == BGP_PEER_IBGP 
 	  && peer_sort (peer) == BGP_PEER_IBGP)
 	{
-	  dummy_attr.extra = NULL;
 	  bgp_attr_dup (&dummy_attr, attr);
-	  info.attr = &dummy_attr; 
+	  info.attr = &dummy_attr;
 	}
 
       SET_FLAG (peer->rmap_type, PEER_RMAP_TYPE_OUT); 
@@ -1070,7 +1068,8 @@ bgp_announce_check (struct bgp_info *ri, struct peer *peer, struct prefix *p,
 
       peer->rmap_type = 0;
       
-      bgp_attr_extra_free (&dummy_attr);
+      if (dummy_attr.extra)
+        bgp_attr_extra_free (&dummy_attr);
       
       if (ret == RMAP_DENYMATCH)
 	{
@@ -1173,7 +1172,7 @@ bgp_announce_check_rsclient (struct bgp_info *ri, struct peer *rsclient,
 #endif /* BGP_SEND_ASPATH_CHECK */
 
   /* For modify attribute, copy it to temporary structure. */
-  *attr = *ri->attr;
+  bgp_attr_dup (attr, ri->attr);
 
   /* next-hop-set */
   if ((p->family == AF_INET && attr->nexthop.s_addr == 0)
@@ -1375,21 +1374,22 @@ bgp_best_selection (struct bgp *bgp, struct bgp_node *rn, struct bgp_info_pair *
 
 static int
 bgp_process_announce_selected (struct peer *peer, struct bgp_info *selected,
-        struct bgp_node *rn, struct attr *attr, afi_t afi, safi_t safi)
-    {
+                               struct bgp_node *rn, afi_t afi, safi_t safi)
+{
   struct prefix *p;
+  struct attr attr = { 0 };
 
   p = &rn->p;
 
-      /* Announce route to Established peer. */
-      if (peer->status != Established)
+  /* Announce route to Established peer. */
+  if (peer->status != Established)
     return 0;
 
-      /* Address family configuration check. */
-      if (! peer->afc_nego[afi][safi])
+  /* Address family configuration check. */
+  if (! peer->afc_nego[afi][safi])
     return 0;
 
-      /* First update is deferred until ORF or ROUTE-REFRESH is received */
+  /* First update is deferred until ORF or ROUTE-REFRESH is received */
   if (CHECK_FLAG (peer->af_sflags[afi][safi],
       PEER_STATUS_ORF_WAIT_REFRESH))
     return 0;
@@ -1399,21 +1399,24 @@ bgp_process_announce_selected (struct peer *peer, struct bgp_info *selected,
       case BGP_TABLE_MAIN:
       /* Announcement to peer->conf.  If the route is filtered,
          withdraw it. */
-        if (selected && bgp_announce_check (selected, peer, p, attr, afi, safi))
-          bgp_adj_out_set (rn, peer, p, attr, afi, safi, selected);
+        if (selected && bgp_announce_check (selected, peer, p, &attr, afi, safi))
+          bgp_adj_out_set (rn, peer, p, &attr, afi, safi, selected);
         else
           bgp_adj_out_unset (rn, peer, p, afi, safi);
         break;
       case BGP_TABLE_RSCLIENT:
         /* Announcement to peer->conf.  If the route is filtered, 
            withdraw it. */
-        if (selected && bgp_announce_check_rsclient
-              (selected, peer, p, attr, afi, safi))
-          bgp_adj_out_set (rn, peer, p, attr, afi, safi, selected);
-      else
-	bgp_adj_out_unset (rn, peer, p, afi, safi);
+        if (selected && 
+            bgp_announce_check_rsclient (selected, peer, p, &attr, afi, safi))
+          bgp_adj_out_set (rn, peer, p, &attr, afi, safi, selected);
+        else
+	  bgp_adj_out_unset (rn, peer, p, afi, safi);
         break;
     }
+  
+  bgp_attr_extra_free (&attr);
+  
   return 0;
 }
 
@@ -1463,8 +1466,7 @@ bgp_process_rsclient (struct work_queue *wq, void *data)
 	      bgp_info_unset_flag (rn, new_select, BGP_INFO_ATTR_CHANGED);
 	    }
 
-	  bgp_process_announce_selected (rsclient, new_select, rn, &attr,
-					 afi, safi);
+	  bgp_process_announce_selected (rsclient, new_select, rn, afi, safi);
 	}
     }
   else
@@ -1476,8 +1478,7 @@ bgp_process_rsclient (struct work_queue *wq, void *data)
 	  bgp_info_set_flag (rn, new_select, BGP_INFO_SELECTED);
 	  bgp_info_unset_flag (rn, new_select, BGP_INFO_ATTR_CHANGED);
 	}
-      bgp_process_announce_selected (rsclient, new_select, rn,
-				     &attr, afi, safi);
+      bgp_process_announce_selected (rsclient, new_select, rn, afi, safi);
     }
 
   if (old_select && CHECK_FLAG (old_select->flags, BGP_INFO_REMOVED))
@@ -1503,9 +1504,6 @@ bgp_process_main (struct work_queue *wq, void *data)
   struct bgp_info_pair old_and_new;
   struct listnode *node, *nnode;
   struct peer *peer;
-  struct attr attr;
-  
-  memset (&attr, 0, sizeof (struct attr));
   
   /* Best path selection. */
   bgp_best_selection (bgp, rn, &old_and_new);
@@ -1537,7 +1535,7 @@ bgp_process_main (struct work_queue *wq, void *data)
   /* Check each BGP peer. */
   for (ALL_LIST_ELEMENTS (bgp->peer, node, nnode, peer))
     {
-      bgp_process_announce_selected (peer, new_select, rn, &attr, afi, safi);
+      bgp_process_announce_selected (peer, new_select, rn, afi, safi);
     }
 
   /* FIB update. */
@@ -1562,8 +1560,6 @@ bgp_process_main (struct work_queue *wq, void *data)
   if (old_select && CHECK_FLAG (old_select->flags, BGP_INFO_REMOVED))
     bgp_info_reap (rn, old_select);
   
-  bgp_attr_extra_free (&attr);
-  
   UNSET_FLAG (rn->flags, BGP_NODE_PROCESS_SCHEDULED);
   return WQ_SUCCESS;
 }
@@ -6214,7 +6210,7 @@ bgp_show_table (struct vty *vty, struct bgp_table *table, struct in_addr *router
 	      {
 		struct route_map *rmap = output_arg;
 		struct bgp_info binfo;
-		struct attr dummy_attr; 
+		struct attr dummy_attr = { 0 }; 
 		int ret;
 
 		bgp_attr_dup (&dummy_attr, ri->attr);