+ 9p-fix-a-potential-acl-leak.patch added to -mm tree

+ 9p-fix-a-potential-acl-leak.patch added to -mm tree

[akpm]

The patch titled
     Subject: 9p: fix a potential acl leak
has been added to the -mm tree.  Its filename is
     9p-fix-a-potential-acl-leak.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/9p-fix-a-potential-acl-leak.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/9p-fix-a-potential-acl-leak.patch

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------------------------------------------------------
From: Cong Wang <xiyou.wangcong@gmail.com>
Subject: 9p: fix a potential acl leak

posix_acl_update_mode() could possibly clear 'acl', if so we leak the
memory pointed by 'acl'.  Save this pointer before calling
posix_acl_update_mode() and release the memory if 'acl' really gets
cleared.

Link: http://lkml.kernel.org/r/1486678332-2430-1-git-send-email-xiyou.wangcong@gmail.com
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Reported-by: Mark Salyzyn <salyzyn@android.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Greg Kurz <groug@kaod.org>
Cc: Eric Van Hensbergen <ericvh@gmail.com>
Cc: Ron Minnich <rminnich@sandia.gov>
Cc: Latchesar Ionkov <lucho@ionkov.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/9p/acl.c |    2 ++
 1 file changed, 2 insertions(+)

diff -puN fs/9p/acl.c~9p-fix-a-potential-acl-leak fs/9p/acl.c
--- a/fs/9p/acl.c~9p-fix-a-potential-acl-leak
+++ a/fs/9p/acl.c
@@ -277,6 +277,7 @@ static int v9fs_xattr_set_acl(const stru
 	case ACL_TYPE_ACCESS:
 		if (acl) {
 			struct iattr iattr;
+			struct posix_acl *old_acl = acl;
 
 			retval = posix_acl_update_mode(inode, &iattr.ia_mode, &acl);
 			if (retval)
@@ -287,6 +288,7 @@ static int v9fs_xattr_set_acl(const stru
 				 * by the mode bits. So don't
 				 * update ACL.
 				 */
+				posix_acl_release(old_acl);
 				value = NULL;
 				size = 0;
 			}
_

Patches currently in -mm which might be from xiyou.wangcong@gmail.com are

9p-fix-a-potential-acl-leak.patch