watchfrr: fix crash on missing optional argument

Fix `netns` command line handling for missing argument (it's optional).

Signed-off-by: Rafael Zalamena <rzalamena@opensourcerouting.org>

diff --git a/watchfrr/watchfrr.c b/watchfrr/watchfrr.c
index 319bd6a771f5424a5a266d2b79033e27e05c9ce4..12682fa35e48db3d0a7f3a89c431f153c64fd218 100644 (file)
--- a/watchfrr/watchfrr.c
+++ b/watchfrr/watchfrr.c
@@ -1414,7 +1414,7 @@ int main(int argc, char **argv)
                } break;
                case OPTION_NETNS:
                        netns_en = true;
-                       if (strchr(optarg, '/')) {
+                       if (optarg && strchr(optarg, '/')) {
                                fprintf(stderr,
                                        "invalid network namespace name \"%s\" (may not contain slashes)\n",
                                        optarg);