linux-kernel - [PATCH 4.19 017/133] cgroup: Fix sock_cgroup

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Message-Id: <20200720152804.555945669@linuxfoundation.org>
Date:   Mon, 20 Jul 2020 17:36:04 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.19 017/133] cgroup: Fix sock_cgroup_data on big-endian.

From: Cong Wang <xiyou.wangcong@...il.com>

[ Upstream commit 14b032b8f8fce03a546dcf365454bec8c4a58d7d ]

In order for no_refcnt and is_data to be the lowest order two
bits in the 'val' we have to pad out the bitfield of the u8.

Fixes: ad0f75e5f57c ("cgroup: fix cgroup_sk_alloc() for sk_clone_lock()")
Reported-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 include/linux/cgroup-defs.h |    2 ++
 1 file changed, 2 insertions(+)

--- a/include/linux/cgroup-defs.h
+++ b/include/linux/cgroup-defs.h
@@ -757,6 +757,7 @@ struct sock_cgroup_data {
 		struct {
 			u8	is_data : 1;
 			u8	no_refcnt : 1;
+			u8	unused : 6;
 			u8	padding;
 			u16	prioidx;
 			u32	classid;
@@ -766,6 +767,7 @@ struct sock_cgroup_data {
 			u32	classid;
 			u16	prioidx;
 			u8	padding;
+			u8	unused : 6;
 			u8	no_refcnt : 1;
 			u8	is_data : 1;
 		} __packed;