Do not read past the end of the buffer if an "f" layout font modifier

[mandoc.git] / mdoc_macro.c

diff --git a/mdoc_macro.c b/mdoc_macro.c
index 8bc799198131661594547ba6ddbd50d8f5bc24d5..f04acb96e73bbbb43285a8ad3ad20b6590c30c8b 100644 (file)
--- a/mdoc_macro.c
+++ b/mdoc_macro.c
@@ -1,4 +1,4 @@
-/*     $Id: mdoc_macro.c,v 1.177 2015/02/06 01:07:22 schwarze Exp $ */
+/*     $Id: mdoc_macro.c,v 1.180 2015/02/07 16:42:33 schwarze Exp $ */
 /*
  * Copyright (c) 2008-2012 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2010, 2012-2015 Ingo Schwarze <schwarze@openbsd.org>
@@ -941,6 +941,7 @@ blk_full(MACRO_PROT_ARGS)
                                            mdoc_macronames[tok],
                                            mdoc_macronames[n->tok]);
                                        rew_pending(mdoc, n);
+                                       n = mdoc->last;
                                        continue;
                                case MDOC_It:
                                        /* Delay in case it's astray. */
@@ -1403,6 +1404,13 @@ in_line_eoln(MACRO_PROT_ARGS)
                        rew_last(mdoc, mdoc->last->parent);
        }
 
+       if (buf[*pos] == '\0' &&
+           (tok == MDOC_Fd || mdoc_macronames[tok][0] == '%')) {
+               mandoc_msg(MANDOCERR_MACRO_EMPTY, mdoc->parse,
+                   line, ppos, mdoc_macronames[tok]);
+               return;
+       }
+
        mdoc_argv(mdoc, line, tok, &arg, pos, buf);
        mdoc_elem_alloc(mdoc, line, ppos, tok, arg);
        if (parse_rest(mdoc, tok, line, pos, buf))