mdocml: Reject non-printable characters found in the input stream even

[schwarze@mdocml.bsd.lv]

Log Message:
-----------
Reject non-printable characters found in the input stream even when
preceded by a backslash; otherwise, the escape sequence would later 
be identified as invalid and the non-printable character would be
passed through to the output backends, sometimes triggering assertions.

Reported by Mike Small <smallm at panix dot com> on the mdocml discuss list.

Modified Files:
--------------
    mdocml:
        read.c

Revision Data
-------------
Index: read.c
===================================================================
RCS file: /usr/vhosts/mdocml.bsd.lv/cvs/mdocml/read.c,v
retrieving revision 1.34
retrieving revision 1.35
diff -Lread.c -Lread.c -u -p -r1.34 -r1.35
--- read.c
+++ read.c
@@ -1,7 +1,7 @@
 /*	$Id$ */
 /*
  * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
- * Copyright (c) 2010, 2011, 2012 Ingo Schwarze <schwarze@openbsd.org>
+ * Copyright (c) 2010, 2011, 2012, 2013 Ingo Schwarze <schwarze@openbsd.org>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -328,6 +328,15 @@ mparse_buf_r(struct mparse *curp, struct
 				break;
 			}
 
+			/*
+			 * Make sure we have space for at least
+			 * one backslash and one other character
+			 * and the trailing NUL byte.
+			 */
+
+			if (pos + 2 >= (int)ln.sz)
+				resize_buf(&ln, 256);
+
 			/* 
 			 * Warn about bogus characters.  If you're using
 			 * non-ASCII encoding, you're screwing your
@@ -344,8 +353,6 @@ mparse_buf_r(struct mparse *curp, struct
 				mandoc_msg(MANDOCERR_BADCHAR, curp,
 						curp->line, pos, NULL);
 				i++;
-				if (pos >= (int)ln.sz)
-					resize_buf(&ln, 256);
 				ln.buf[pos++] = '?';
 				continue;
 			}
@@ -353,8 +360,6 @@ mparse_buf_r(struct mparse *curp, struct
 			/* Trailing backslash = a plain char. */
 
 			if ('\\' != blk.buf[i] || i + 1 == (int)blk.sz) {
-				if (pos >= (int)ln.sz)
-					resize_buf(&ln, 256);
 				ln.buf[pos++] = blk.buf[i++];
 				continue;
 			}
@@ -396,10 +401,20 @@ mparse_buf_r(struct mparse *curp, struct
 				break;
 			}
 
-			/* Some other escape sequence, copy & cont. */
+			/* Catch escaped bogus characters. */
 
-			if (pos + 1 >= (int)ln.sz)
-				resize_buf(&ln, 256);
+			c = (unsigned char) blk.buf[i+1];
+
+			if ( ! (isascii(c) && 
+					(isgraph(c) || isblank(c)))) {
+				mandoc_msg(MANDOCERR_BADCHAR, curp,
+						curp->line, pos, NULL);
+				i += 2;
+				ln.buf[pos++] = '?';
+				continue;
+			}
+
+			/* Some other escape sequence, copy & cont. */
 
 			ln.buf[pos++] = blk.buf[i++];
 			ln.buf[pos++] = blk.buf[i++];
--
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