fail gracefully if argc is zero

1 files changed, 6 insertions, 0 deletions

diff --git a/src/firejail/main.c b/src/firejail/main.c
index 900e61226..e8664e914 100644
--- a/src/firejail/main.c
+++ b/src/firejail/main.c
@@ -952,6 +952,12 @@ int main(int argc, char **argv) {
         // sanitize the umask
         orig_umask = umask(022);
 
+        // argument count should be larger than 0
+        if (argc == 0) {
+                fprintf(stderr, "Error: argv[0] is NULL\n");
+                exit(1);
+        }
+
         // check if the user is allowed to use firejail
         init_cfg(argc, argv);