pimd: avoid writing to negative fd

Coverty #1465483

Signed-off-by: Quentin Young <qlyoung@cumulusnetworks.com>

diff --git a/pimd/mtracebis_routeget.c b/pimd/mtracebis_routeget.c
index d75aaa3708bb5e6436552dcfb30056442b257857..8c1cd8d96303b03995347409b10db6ddd3960986 100644 (file)
--- a/pimd/mtracebis_routeget.c
+++ b/pimd/mtracebis_routeget.c
@@ -81,7 +81,7 @@ int routeget(struct in_addr dst, struct in_addr *src, struct in_addr *gw)
 
        ret = rtnl_open(&rth, 0);
 
-       if (ret < 0)
+       if (ret < 0 || rth.fd <= 0)
                return ret;
 
        if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0) {