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From:   Ben Hutchings <ben@decadent.org.uk>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
CC:     akpm@linux-foundation.org,
        "Mauro Carvalho Chehab" <mchehab@s-opensource.com>,
        "Sakari Ailus" <sakari.ailus@linux.intel.com>,
        "Hans Verkuil" <hans.verkuil@cisco.com>
Date:   Wed, 28 Feb 2018 15:20:18 +0000
Message-ID: <lsq.1519831218.267938302@decadent.org.uk>
Subject: [PATCH 3.16 244/254] media: v4l2-compat-ioctl32.c: move  'helper'
 functions to __get/put_v4l2_format32
In-Reply-To: <lsq.1519831217.271785318@decadent.org.uk>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

3.16.55-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Hans Verkuil <hans.verkuil@cisco.com>

commit 486c521510c44a04cd756a9267e7d1e271c8a4ba upstream.

These helper functions do not really help. Move the code to the
__get/put_v4l2_format32 functions.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
[bwh: Rebased on top of some earlier fixes]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
--- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
+++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
@@ -89,64 +89,6 @@ static int put_v4l2_window32(struct v4l2
 	return 0;
 }
 
-static inline int get_v4l2_pix_format(struct v4l2_pix_format *kp, struct v4l2_pix_format __user *up)
-{
-	if (copy_from_user(kp, up, sizeof(struct v4l2_pix_format)))
-		return -EFAULT;
-	return 0;
-}
-
-static inline int get_v4l2_pix_format_mplane(struct v4l2_pix_format_mplane *kp,
-					     struct v4l2_pix_format_mplane __user *up)
-{
-	if (copy_from_user(kp, up, sizeof(struct v4l2_pix_format_mplane)))
-		return -EFAULT;
-	return 0;
-}
-
-static inline int put_v4l2_pix_format(struct v4l2_pix_format *kp, struct v4l2_pix_format __user *up)
-{
-	if (copy_to_user(up, kp, sizeof(struct v4l2_pix_format)))
-		return -EFAULT;
-	return 0;
-}
-
-static inline int put_v4l2_pix_format_mplane(struct v4l2_pix_format_mplane *kp,
-					     struct v4l2_pix_format_mplane __user *up)
-{
-	if (copy_to_user(up, kp, sizeof(struct v4l2_pix_format_mplane)))
-		return -EFAULT;
-	return 0;
-}
-
-static inline int get_v4l2_vbi_format(struct v4l2_vbi_format *kp, struct v4l2_vbi_format __user *up)
-{
-	if (copy_from_user(kp, up, sizeof(struct v4l2_vbi_format)))
-		return -EFAULT;
-	return 0;
-}
-
-static inline int put_v4l2_vbi_format(struct v4l2_vbi_format *kp, struct v4l2_vbi_format __user *up)
-{
-	if (copy_to_user(up, kp, sizeof(struct v4l2_vbi_format)))
-		return -EFAULT;
-	return 0;
-}
-
-static inline int get_v4l2_sliced_vbi_format(struct v4l2_sliced_vbi_format *kp, struct v4l2_sliced_vbi_format __user *up)
-{
-	if (copy_from_user(kp, up, sizeof(struct v4l2_sliced_vbi_format)))
-		return -EFAULT;
-	return 0;
-}
-
-static inline int put_v4l2_sliced_vbi_format(struct v4l2_sliced_vbi_format *kp, struct v4l2_sliced_vbi_format __user *up)
-{
-	if (copy_to_user(up, kp, sizeof(struct v4l2_sliced_vbi_format)))
-		return -EFAULT;
-	return 0;
-}
-
 struct v4l2_format32 {
 	__u32	type;	/* enum v4l2_buf_type */
 	union {
@@ -184,20 +126,23 @@ static int __get_v4l2_format32(struct v4
 	switch (kp->type) {
 	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
-		return get_v4l2_pix_format(&kp->fmt.pix, &up->fmt.pix);
+		return copy_from_user(&kp->fmt.pix, &up->fmt.pix,
+				      sizeof(kp->fmt.pix)) ? -EFAULT : 0;
 	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
 	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
-		return get_v4l2_pix_format_mplane(&kp->fmt.pix_mp,
-						  &up->fmt.pix_mp);
+		return copy_from_user(&kp->fmt.pix_mp, &up->fmt.pix_mp,
+				      sizeof(kp->fmt.pix_mp)) ? -EFAULT : 0;
 	case V4L2_BUF_TYPE_VIDEO_OVERLAY:
 	case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
 		return get_v4l2_window32(&kp->fmt.win, &up->fmt.win);
 	case V4L2_BUF_TYPE_VBI_CAPTURE:
 	case V4L2_BUF_TYPE_VBI_OUTPUT:
-		return get_v4l2_vbi_format(&kp->fmt.vbi, &up->fmt.vbi);
+		return copy_from_user(&kp->fmt.vbi, &up->fmt.vbi,
+				      sizeof(kp->fmt.vbi)) ? -EFAULT : 0;
 	case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
 	case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
-		return get_v4l2_sliced_vbi_format(&kp->fmt.sliced, &up->fmt.sliced);
+		return copy_from_user(&kp->fmt.sliced, &up->fmt.sliced,
+				      sizeof(kp->fmt.sliced)) ? -EFAULT : 0;
 	default:
 		printk(KERN_INFO "compat_ioctl32: unexpected VIDIOC_FMT type %d\n",
 		       kp->type);
@@ -228,20 +173,23 @@ static int __put_v4l2_format32(struct v4
 	switch (kp->type) {
 	case V4L2_BUF_TYPE_VIDEO_CAPTURE:
 	case V4L2_BUF_TYPE_VIDEO_OUTPUT:
-		return put_v4l2_pix_format(&kp->fmt.pix, &up->fmt.pix);
+		return copy_to_user(&up->fmt.pix, &kp->fmt.pix,
+				    sizeof(kp->fmt.pix)) ? -EFAULT : 0;
 	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
 	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
-		return put_v4l2_pix_format_mplane(&kp->fmt.pix_mp,
-						  &up->fmt.pix_mp);
+		return copy_to_user(&up->fmt.pix_mp, &kp->fmt.pix_mp,
+				    sizeof(kp->fmt.pix_mp)) ? -EFAULT : 0;
 	case V4L2_BUF_TYPE_VIDEO_OVERLAY:
 	case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
 		return put_v4l2_window32(&kp->fmt.win, &up->fmt.win);
 	case V4L2_BUF_TYPE_VBI_CAPTURE:
 	case V4L2_BUF_TYPE_VBI_OUTPUT:
-		return put_v4l2_vbi_format(&kp->fmt.vbi, &up->fmt.vbi);
+		return copy_to_user(&up->fmt.vbi, &kp->fmt.vbi,
+				    sizeof(kp->fmt.vbi)) ? -EFAULT : 0;
 	case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
 	case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
-		return put_v4l2_sliced_vbi_format(&kp->fmt.sliced, &up->fmt.sliced);
+		return copy_to_user(&up->fmt.sliced, &kp->fmt.sliced,
+				    sizeof(kp->fmt.sliced)) ? -EFAULT : 0;
 	default:
 		printk(KERN_INFO "compat_ioctl32: unexpected VIDIOC_FMT type %d\n",
 		       kp->type);
@@ -548,10 +496,10 @@ static int get_v4l2_framebuffer32(struct
 	if (!access_ok(VERIFY_READ, up, sizeof(struct v4l2_framebuffer32)) ||
 	    get_user(tmp, &up->base) ||
 	    get_user(kp->capability, &up->capability) ||
-	    get_user(kp->flags, &up->flags))
+	    get_user(kp->flags, &up->flags) ||
+	    copy_from_user(&kp->fmt, &up->fmt, sizeof(up->fmt)))
 		return -EFAULT;
 	kp->base = (__force void *)compat_ptr(tmp);
-	get_v4l2_pix_format(&kp->fmt, &up->fmt);
 	return 0;
 }
 
@@ -562,9 +510,9 @@ static int put_v4l2_framebuffer32(struct
 	if (!access_ok(VERIFY_WRITE, up, sizeof(struct v4l2_framebuffer32)) ||
 	    put_user(tmp, &up->base) ||
 	    put_user(kp->capability, &up->capability) ||
-	    put_user(kp->flags, &up->flags))
+	    put_user(kp->flags, &up->flags) ||
+	    copy_to_user(&up->fmt, &kp->fmt, sizeof(up->fmt)))
 		return -EFAULT;
-	put_v4l2_pix_format(&kp->fmt, &up->fmt);
 	return 0;
 }