From: Simon Wilkinson <sxw@your-file-system.com>
Date: Sat, 2 Mar 2013 09:16:10 +0000 (+0000)
Subject: aklog: Fix improper use of readlink
X-Git-Tag: upstream/1.8.0_pre1^2~1357
X-Git-Url: https://git.michaelhowe.org/gitweb/?a=commitdiff_plain;h=2fac53522e7ef5b3a376e191bffdc1f6784e6995;p=packages%2Fo%2Fopenafs.git

aklog: Fix improper use of readlink

readlink doesn't NUL terminate its return string, so it is up to
us to do so.

Caught by coverity (#985739)

Change-Id: Ifb858d628845bd963928e25834e540bbb3a187c8
Reviewed-on: http://gerrit.openafs.org/9347
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
---

diff --git a/src/aklog/aklog.c b/src/aklog/aklog.c
index 6e096b0d1..22df70d27 100644
--- a/src/aklog/aklog.c
+++ b/src/aklog/aklog.c
@@ -1192,12 +1192,16 @@ next_path(char *origpath)
 	    ? elast_comp - last_comp : strlen(last_comp);
 	strncat(pathtocheck, last_comp, len);
 	memset(linkbuf, 0, sizeof(linkbuf));
-	if ((link = (readlink(pathtocheck, linkbuf,
-				    sizeof(linkbuf)) > 0))) {
+	link = readlink(pathtocheck, linkbuf, sizeof(linkbuf)-1);
+
+	if (link > 0) {
+	    linkbuf[link] = '\0'; /* NUL terminate string */
+
 	    if (++symlinkcount > MAXSYMLINKS) {
 		fprintf(stderr, "%s: %s\n", progname, strerror(ELOOP));
 		exit(AKLOG_BADPATH);
 	    }
+
 	    memset(tmpbuf, 0, sizeof(tmpbuf));
 	    if (elast_comp)
 		strcpy(tmpbuf, elast_comp);