Patch "9p: fix a potential acl leak" has been added to the 4.10-stable tree

This is a note to let you know that I've just added the patch titled

9p: fix a potential acl leak

to the 4.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
9p-fix-a-potential-acl-leak.patch
and it can be found in the queue-4.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Cong Wang <[email protected]>
Date: Wed, 22 Feb 2017 15:40:53 -0800
Subject: 9p: fix a potential acl leak

From: Cong Wang <[email protected]>

commit b5c66bab72a6a65edb15beb60b90d3cb84c5763b upstream.

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.

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

@@ -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 stable-queue which might be from [email protected] are

queue-4.10/9p-fix-a-potential-acl-leak.patch