Add range check

diff --git a/src/nnn.c b/src/nnn.c
index 2da6c9e2efe932d75966f7edff375aba30e32b52..90c2fc508c736925daf024d4baf2e119309bfdc6 100644 (file)
--- a/src/nnn.c
+++ b/src/nnn.c
@@ -7857,8 +7857,12 @@ int main(int argc, char *argv[])
                        break;
 #ifndef NOFIFO
                case 'F':
-                       if (env_opts_id < 0)
-                               g_state.fifobits = atoi(optarg);
+                       if (env_opts_id < 0) {
+                               fd = atoi(optarg);
+                               if ((fd < 0) || (fd > 2))
+                                       return EXIT_FAILURE;
+                               g_state.fifobits = fd;
+                       }
                        break;
 #endif
                case 'g':