main: Validate the number of numeric options

The number of numeric options influences the behavior and the user
should be warned if a invalid number is used.

Signed-off-by: Elise Lennion <elise.lennion@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 6 insertions, 1 deletions

diff --git a/src/main.c b/src/main.c
index 6ba752b1..1cc8b39f 100644
--- a/src/main.c
+++ b/src/main.c
@@ -288,7 +288,12 @@ int main(int argc, char * const *argv)
 			include_paths[num_include_paths++] = optarg;
 			break;
 		case OPT_NUMERIC:
-			numeric_output++;
+			if (++numeric_output > NUMERIC_ALL) {
+				fprintf(stderr, "Too many numeric options "
+						"used, max. %u\n",
+					NUMERIC_ALL);
+				exit(NFT_EXIT_FAILURE);
+			}
 			break;
 		case OPT_STATELESS:
 			stateless_output++;