For all accesses to "struct route_list * rl", check first that rl is non-NULL

In IPv4-only mode, this cannot happen, but if IPv6 is enabled
and a servers pushes IPv6 routes and no IPv4 routes -> crash boom.

Signed-off-by: Gert Doering <gert@greenie.muc.de>
Acked-By: David Sommerseth <davids@redhat.com>
Signed-off-by: David Sommerseth <davids@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/route.h b/route.h
index f900d3e..9953478 100644
--- a/route.h
+++ b/route.h
@@ -328,7 +328,7 @@ route_list_vpn_gateway_needed (const struct route_list *rl)
 static inline int
 route_did_redirect_default_gateway(const struct route_list *rl)
 {
-  return BOOL_CAST(rl->iflags & RL_DID_REDIRECT_DEFAULT_GATEWAY);
+  return rl && BOOL_CAST(rl->iflags & RL_DID_REDIRECT_DEFAULT_GATEWAY);
 }
 
 #endif