jffs2: Do not rewrite posix_acl_equiv_mode() result in jffs2_set_acl()

[koloskov <koloskov@ispras.ru>]

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: 0001-jffs2-Do-not-rewrite-posix_acl_equiv_mode-result-in.patch --]
[-- Type: text/x-mail; name=0001-jffs2-Do-not-rewrite-posix_acl_equiv_mode-result-in.patch, Size: 1747 bytes --]

From ad03fe743959c04a9e7d611c026c201a14ce0ed6 Mon Sep 17 00:00:00 2001
From: Andrey Koloskov <koloskov@ispras.ru>
To: David Woodhouse <dwmw2@infradead.org>
Cc: linux-mtd@lists.infradead.org
Cc: linux-kernel@vger.kernel.org

Date: Tue, 13 Jan 2015 14:37:18 +0400
Subject: [PATCH] jffs2: Do not rewrite posix_acl_equiv_mode() result in
 jffs2_set_acl()

Result of posix_acl_equiv_mode() is rewritten with one of jffs2_do_setattr(),
so it is always assumed that acl can be exactly represented by the
traditional file mode permission bits.

The patch adds a new variable for store result of posix_acl_equiv_mode().

Found by Linux File System Verification project (linuxtesting.org).

Signed-off-by: Andrey Koloskov <koloskov@ispras.ru>
---
 fs/jffs2/acl.c |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/fs/jffs2/acl.c b/fs/jffs2/acl.c
index 2f7a3c0..63705bd 100644
--- a/fs/jffs2/acl.c
+++ b/fs/jffs2/acl.c
@@ -229,16 +229,16 @@ static int __jffs2_set_acl(struct inode *inode, int xprefix, struct posix_acl *a
 
 int jffs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
 {
-	int rc, xprefix;
+	int rc, xprefix, not_equiv;
 
 	switch (type) {
 	case ACL_TYPE_ACCESS:
 		xprefix = JFFS2_XPREFIX_ACL_ACCESS;
 		if (acl) {
 			umode_t mode = inode->i_mode;
-			rc = posix_acl_equiv_mode(acl, &mode);
-			if (rc < 0)
-				return rc;
+			not_equiv = posix_acl_equiv_mode(acl, &mode);
+			if (not_equiv < 0)
+				return not_equiv;
 			if (inode->i_mode != mode) {
 				struct iattr attr;
 
@@ -249,7 +249,7 @@ int jffs2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
 				if (rc < 0)
 					return rc;
 			}
-			if (rc == 0)
+			if (not_equiv == 0)
 				acl = NULL;
 		}
 		break;
-- 
1.7.9.5