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 d1003ad5fac38785672e54710b57a66daa27b380..81ada35795eca750a040812e27321ed59326b277 100644 (file)
--- a/watchfrr/watchfrr.c
+++ b/watchfrr/watchfrr.c
@@ -1416,7 +1416,7 @@ 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);