svn commit: r204447 - head/lib/libc/stdio

[Jaakko Heinonen]

Author: jh
Date: Sun Feb 28 13:31:29 2010
New Revision: 204447
URL: http://svn.freebsd.org/changeset/base/204447

Log:
  In _gettemp(), check that the length of the path doesn't exceed
  MAXPATHLEN. Otherwise the path name (or part of it) may not fit to
  carrybuf causing a buffer overflow.
  
  PR:		bin/140228
  Suggested by:	jilles

Modified:
  head/lib/libc/stdio/mktemp.c

Modified: head/lib/libc/stdio/mktemp.c
==============================================================================
--- head/lib/libc/stdio/mktemp.c	Sun Feb 28 11:27:03 2010	(r204446)
+++ head/lib/libc/stdio/mktemp.c	Sun Feb 28 13:31:29 2010	(r204447)
@@ -116,6 +116,10 @@ _gettemp(path, doopen, domkdir, slen)
 
 	for (trv = path; *trv != '\0'; ++trv)
 		;
+	if (trv - path >= MAXPATHLEN) {
+		errno = ENAMETOOLONG;
+		return (0);
+	}
 	trv -= slen;
 	suffp = trv;
 	--trv;