linux-kernel - [PATCH 4.3 087/200] [media] v4l2-compat-ioctl32: fix alignment for ARM64

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Date:	Sun, 14 Feb 2016 14:21:34 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Andrzej Hajda <a.hajda@...sung.com>,
	Hans Verkuil <hans.verkuil@...co.com>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>
Subject: [PATCH 4.3 087/200] [media] v4l2-compat-ioctl32: fix alignment for ARM64

4.3-stable review patch.  If anyone has any objections, please let me know.

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

From: Andrzej Hajda <a.hajda@...sung.com>

commit 655e9780ab913a3a06d4a164d55e3b755524186d upstream.

Alignment/padding rules on AMD64 and ARM64 differs. To allow properly match
compatible ioctls on ARM64 kernels without breaking AMD64 some fields
should be aligned using compat_s64 type and in one case struct should be
unpacked.

Signed-off-by: Andrzej Hajda <a.hajda@...sung.com>
[hans.verkuil@...co.com: use compat_u64 instead of compat_s64 in v4l2_input32]
Signed-off-by: Hans Verkuil <hans.verkuil@...co.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

Signed-off-by: Mauro Carvalho Chehab <mchehab@....samsung.com>

---
 drivers/media/v4l2-core/v4l2-compat-ioctl32.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

--- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
+++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
@@ -266,7 +266,7 @@ static int put_v4l2_create32(struct v4l2
 
 struct v4l2_standard32 {
 	__u32		     index;
-	__u32		     id[2]; /* __u64 would get the alignment wrong */
+	compat_u64	     id;
 	__u8		     name[24];
 	struct v4l2_fract    frameperiod; /* Frames, not fields */
 	__u32		     framelines;
@@ -286,7 +286,7 @@ static int put_v4l2_standard32(struct v4
 {
 	if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_standard32)) ||
 		put_user(kp->index, &up->index) ||
-		copy_to_user(up->id, &kp->id, sizeof(__u64)) ||
+		put_user(kp->id, &up->id) ||
 		copy_to_user(up->name, kp->name, 24) ||
 		copy_to_user(&up->frameperiod, &kp->frameperiod, sizeof(kp->frameperiod)) ||
 		put_user(kp->framelines, &up->framelines) ||
@@ -587,10 +587,10 @@ struct v4l2_input32 {
 	__u32	     type;		/*  Type of input */
 	__u32	     audioset;		/*  Associated audios (bitfield) */
 	__u32        tuner;             /*  Associated tuner */
-	v4l2_std_id  std;
+	compat_u64   std;
 	__u32	     status;
 	__u32	     reserved[4];
-} __attribute__ ((packed));
+};
 
 /* The 64-bit v4l2_input struct has extra padding at the end of the struct.
    Otherwise it is identical to the 32-bit version. */
@@ -738,6 +738,7 @@ static int put_v4l2_ext_controls32(struc
 struct v4l2_event32 {
 	__u32				type;
 	union {
+		compat_s64		value64;
 		__u8			data[64];
 	} u;
 	__u32				pending;