INTERNAL: Check ntokens in the prefix related stats command

memcached.c

@@ -8209,8 +8209,11 @@ static void process_stats_command(conn *c, token_t *tokens, const size_t ntokens
         /* NOTE: how to tackle detail with binary? */
         if (ntokens < 4)
             process_stats_detail(c, "");  /* outputs the error message */
-        else
+        else if (ntokens == 4) {
             process_stats_detail(c, tokens[2].value);
+        } else {
+            out_string(c, "CLIENT_ERROR bad command line format");
+        }
         /* Output already generated */
         return;
     } else if (strcmp(subcommand, "settings") == 0) {
@@ -8232,7 +8235,13 @@ static void process_stats_command(conn *c, token_t *tokens, const size_t ntokens
         topkeys_stats(default_topkeys, c, get_current_time(), append_ascii_stats);
     } else if (strcmp(subcommand, "prefixes") == 0) {
         int len;
-        char *stats = mc_engine.v1->prefix_dump_stats(mc_engine.v0, c, NULL, 0, &len);
+        char *stats;
+
+        if (ntokens != 3) {
+            out_string(c, "CLIENT_ERROR bad command line format");
+            return;
+        }
+        stats = mc_engine.v1->prefix_dump_stats(mc_engine.v0, c, NULL, 0, &len);
         if (stats == NULL) {
             if (len == -1)
                 out_string(c, "NOT_SUPPORTED");