linux-kernel - [PATCH v5 7/9] audit: make audit_compare_dname_path use parent

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Message-Id: <1343301673-10642-8-git-send-email-jlayton@redhat.com>
Date:	Thu, 26 Jul 2012 07:21:11 -0400
From:	Jeff Layton <jlayton@...hat.com>
To:	eparis@...hat.com, viro@...iv.linux.org.uk
Cc:	linux-audit@...hat.com, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v5 7/9] audit: make audit_compare_dname_path use parent_len helper

From: Eric Paris <eparis@...hat.com>

Signed-off-by: Eric Paris <eparis@...hat.com>
---
 kernel/auditfilter.c | 27 +++++++--------------------
 1 file changed, 7 insertions(+), 20 deletions(-)

diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index f9c48d0..f47ba18 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -1232,32 +1232,19 @@ int parent_len(const char *path)
  * return of 0 indicates a match. */
 int audit_compare_dname_path(const char *dname, const char *path)
 {
-	int dlen, plen;
+	int dlen, pathlen, parentlen;
 	const char *p;
 
-	if (!dname || !path)
-		return 1;
-
 	dlen = strlen(dname);
-	plen = strlen(path);
-	if (plen < dlen)
+	pathlen = strlen(path);
+	if (pathlen < dlen)
 		return 1;
 
-	/* disregard trailing slashes */
-	p = path + plen - 1;
-	while ((*p == '/') && (p > path))
-		p--;
-
-	/* find last path component */
-	p = p - dlen + 1;
-	if (p < path)
+	parentlen = parent_len(path);
+	if (pathlen - parentlen != dlen)
 		return 1;
-	else if (p > path) {
-		if (*--p != '/')
-			return 1;
-		else
-			p++;
-	}
+
+	p = path + parentlen;
 
 	return strncmp(p, dname, dlen);
 }
-- 
1.7.11.2

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