extcap: check that argument parameter is not null before adding it to command line

Without this test, we add an argument with an empty parameter

Bug: 14006
Change-Id: I7e5313f652691808735f54b533cf5a7f7adeeae1
Reviewed-on: https://code.wireshark.org/review/23271
Reviewed-by: Pascal Quantin <pascal.quantin@gmail.com>
Petri-Dish: Pascal Quantin <pascal.quantin@gmail.com>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Dario Lombardo <lomato@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/extcap.c b/extcap.c
index 3dc2d622ab..53bead8dd5 100644
--- a/extcap.c
+++ b/extcap.c
@@ -1316,7 +1316,7 @@ GPtrArray *extcap_prepare_arguments(interface_options *interface_opts)
                     }
                     else
                     {
-                        if (stored) {
+                        if (stored && strlen(stored) > 0) {
                             add_arg(arg_iter->call);
                             add_arg(stored);
                         }