Small bug fix and improvements

  (1)added error check of if_nameindex() return value at getaddrinfo().
  (2)print out more detailed information when getaddrinfo() error value
     is EAI_SYSTEM.(in this case system error num is kept in errno)

(1) is Discovered by: jinmei@kame.net in KAME environment.

1 files changed, 7 insertions, 0 deletions

diff --git a/lib/libc/net/getaddrinfo.c b/lib/libc/net/getaddrinfo.c
index 79b07de..dd85243 100644
--- a/lib/libc/net/getaddrinfo.c
+++ b/lib/libc/net/getaddrinfo.c
@@ -766,6 +766,10 @@ explore_numeric_scope(pai, hostname, servname, res)
 #ifdef INET6
 	case AF_INET6:
 		scope = if_nametoindex(cp);
+		if (scope == 0) {
+			error = EAI_SYSTEM;
+			goto free;
+		}
 		break;
 #endif
 	}
@@ -784,6 +788,9 @@ explore_numeric_scope(pai, hostname, servname, res)
 		}
 	}
 
+#ifdef INET6
+free:
+#endif
 	free(hostname2);
 
 	return error;