From dfdee678fd03cac5ff7c47a270bdf5bd2c745f59 Mon Sep 17 00:00:00 2001
From: jh <jh@FreeBSD.org>
Date: Sun, 28 Feb 2010 13:31:29 +0000
Subject: [PATCH] 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
---
 lib/libc/stdio/mktemp.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/libc/stdio/mktemp.c b/lib/libc/stdio/mktemp.c
index 3f1e699f213e..a30b930354e3 100644
--- a/lib/libc/stdio/mktemp.c
+++ b/lib/libc/stdio/mktemp.c
@@ -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;