linux-kernel - [066/111] Btrfs: deal with NULL acl sent to btrfs_set

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Message-Id: <20100811235501.611961818@clark.site>
Date:	Wed, 11 Aug 2010 16:54:47 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Chris Mason <chris.mason@...cle.com>,
	Jeff Mahoney <jeffm@...e.com>
Subject: [066/111] Btrfs: deal with NULL acl sent to btrfs_set_acl

2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Chris Mason <chris.mason@...cle.com>

commit a9cc71a60c29a09174bee2fcef8f924c529fd4b7 upstream.

It is legal for btrfs_set_acl to be sent a NULL acl.  This
makes sure we don't dereference it.  A similar patch was sent by
Johannes Hirte <johannes.hirte@....tu-ilmenau.de>

Signed-off-by: Chris Mason <chris.mason@...cle.com>
Acked-by: Jeff Mahoney <jeffm@...e.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 fs/btrfs/acl.c |   12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

--- a/fs/btrfs/acl.c
+++ b/fs/btrfs/acl.c
@@ -112,12 +112,14 @@ static int btrfs_set_acl(struct btrfs_tr
 	switch (type) {
 	case ACL_TYPE_ACCESS:
 		mode = inode->i_mode;
-		ret = posix_acl_equiv_mode(acl, &mode);
-		if (ret < 0)
-			return ret;
-		ret = 0;
-		inode->i_mode = mode;
 		name = POSIX_ACL_XATTR_ACCESS;
+		if (acl) {
+			ret = posix_acl_equiv_mode(acl, &mode);
+			if (ret < 0)
+				return ret;
+			inode->i_mode = mode;
+		}
+		ret = 0;
 		break;
 	case ACL_TYPE_DEFAULT:
 		if (!S_ISDIR(inode->i_mode))


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