1 files changed, 6 insertions, 2 deletions

diff --git a/src/fnetfilter/main.c b/src/fnetfilter/main.c
index ba58ba3c9..34ebf5926 100644
--- a/src/fnetfilter/main.c
+++ b/src/fnetfilter/main.c
@@ -79,13 +79,17 @@ static void process_template(char *src, const char *dest) {
         *arg_start = '\0';
         arg_start++;
         if (*arg_start == '\0') {
-                fprintf(stderr, "Error fnetfilter: you need to provide at least on argument\n");
+                fprintf(stderr, "Error fnetfilter: you need to provide at least one argument\n");
                 exit(1);
         }
 
         // extract the arguments from command line
         char *token = strtok(arg_start, ",");
         while (token) {
+                if (argcnt == MAXARGS) {
+                        fprintf(stderr, "Error fnetfilter: only up to %u arguments are supported\n", (unsigned) MAXARGS);
+                        exit(1);
+                }
                 // look for abnormal things
                 int len = strlen(token);
                 if (strcspn(token, "\\&!?\"'<>%^(){};,*[]") != (size_t)len) {
@@ -125,7 +129,7 @@ for (i = 0; i < argcnt; i++)
                         else {
                                 // parsing
                                 int index = 0;
-                                int rv = sscanf(ptr, "$ARG%u", &index) ;
+                                int rv = sscanf(ptr, "$ARG%d", &index) ;
                                 if (rv != 1) {
                                         fprintf(stderr, "Error fnetfilter: invalid template argument on line %d\n", line);
                                         exit(1);