linux-kernel - [PATCH 3.16 246/254] media: v4l2-compat-ioctl32.c: copy m.userptr in put_v4l2

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Date:   Wed, 28 Feb 2018 15:20:18 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Hans Verkuil" <hans.verkuil@...co.com>,
        "Sakari Ailus" <sakari.ailus@...ux.intel.com>,
        "Mauro Carvalho Chehab" <mchehab@...pensource.com>
Subject: [PATCH 3.16 246/254] media: v4l2-compat-ioctl32.c: copy 
 m.userptr in put_v4l2_plane32

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

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

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

commit 8ed5a59dcb47a6f76034ee760b36e089f3e82529 upstream.

The struct v4l2_plane32 should set m.userptr as well. The same
happens in v4l2_buffer32 and v4l2-compliance tests for this.

Signed-off-by: Hans Verkuil <hans.verkuil@...co.com>
Acked-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...pensource.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/media/v4l2-core/v4l2-compat-ioctl32.c | 47 ++++++++++++++++-----------
 1 file changed, 28 insertions(+), 19 deletions(-)

--- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
+++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
@@ -290,19 +290,24 @@ static int get_v4l2_plane32(struct v4l2_
 			 sizeof(up->data_offset)))
 		return -EFAULT;
 
-	if (memory == V4L2_MEMORY_USERPTR) {
+	switch (memory) {
+	case V4L2_MEMORY_MMAP:
+	case V4L2_MEMORY_OVERLAY:
+		if (copy_in_user(&up->m.mem_offset, &up32->m.mem_offset,
+				 sizeof(up32->m.mem_offset)))
+			return -EFAULT;
+		break;
+	case V4L2_MEMORY_USERPTR:
 		if (get_user(p, &up32->m.userptr))
 			return -EFAULT;
 		up_pln = compat_ptr(p);
 		if (put_user((unsigned long)up_pln, &up->m.userptr))
 			return -EFAULT;
-	} else if (memory == V4L2_MEMORY_DMABUF) {
+		break;
+	case V4L2_MEMORY_DMABUF:
 		if (copy_in_user(&up->m.fd, &up32->m.fd, sizeof(up32->m.fd)))
 			return -EFAULT;
-	} else {
-		if (copy_in_user(&up->m.mem_offset, &up32->m.mem_offset,
-				 sizeof(up32->m.mem_offset)))
-			return -EFAULT;
+		break;
 	}
 
 	return 0;
@@ -311,22 +316,32 @@ static int get_v4l2_plane32(struct v4l2_
 static int put_v4l2_plane32(struct v4l2_plane __user *up, struct v4l2_plane32 __user *up32,
 			    enum v4l2_memory memory)
 {
+	unsigned long p;
+
 	if (copy_in_user(up32, up, 2 * sizeof(__u32)) ||
 	    copy_in_user(&up32->data_offset, &up->data_offset,
 			 sizeof(up->data_offset)))
 		return -EFAULT;
 
-	/* For MMAP, driver might've set up the offset, so copy it back.
-	 * USERPTR stays the same (was userspace-provided), so no copying. */
-	if (memory == V4L2_MEMORY_MMAP)
+	switch (memory) {
+	case V4L2_MEMORY_MMAP:
+	case V4L2_MEMORY_OVERLAY:
 		if (copy_in_user(&up32->m.mem_offset, &up->m.mem_offset,
 				 sizeof(up->m.mem_offset)))
 			return -EFAULT;
-	/* For DMABUF, driver might've set up the fd, so copy it back. */
-	if (memory == V4L2_MEMORY_DMABUF)
+		break;
+	case V4L2_MEMORY_USERPTR:
+		if (get_user(p, &up->m.userptr) ||
+		    put_user((compat_ulong_t)ptr_to_compat((__force void *)p),
+			     &up32->m.userptr))
+			return -EFAULT;
+		break;
+	case V4L2_MEMORY_DMABUF:
 		if (copy_in_user(&up32->m.fd, &up->m.fd,
 				 sizeof(up->m.fd)))
 			return -EFAULT;
+		break;
+	}
 
 	return 0;
 }
@@ -387,6 +402,7 @@ static int get_v4l2_buffer32(struct v4l2
 	} else {
 		switch (kp->memory) {
 		case V4L2_MEMORY_MMAP:
+		case V4L2_MEMORY_OVERLAY:
 			if (get_user(kp->m.offset, &up->m.offset))
 				return -EFAULT;
 			break;
@@ -400,10 +416,6 @@ static int get_v4l2_buffer32(struct v4l2
 				kp->m.userptr = (unsigned long)compat_ptr(tmp);
 			}
 			break;
-		case V4L2_MEMORY_OVERLAY:
-			if (get_user(kp->m.offset, &up->m.offset))
-				return -EFAULT;
-			break;
 		case V4L2_MEMORY_DMABUF:
 			if (get_user(kp->m.fd, &up->m.fd))
 				return -EFAULT;
@@ -460,6 +472,7 @@ static int put_v4l2_buffer32(struct v4l2
 	} else {
 		switch (kp->memory) {
 		case V4L2_MEMORY_MMAP:
+		case V4L2_MEMORY_OVERLAY:
 			if (put_user(kp->m.offset, &up->m.offset))
 				return -EFAULT;
 			break;
@@ -467,10 +480,6 @@ static int put_v4l2_buffer32(struct v4l2
 			if (put_user(kp->m.userptr, &up->m.userptr))
 				return -EFAULT;
 			break;
-		case V4L2_MEMORY_OVERLAY:
-			if (put_user(kp->m.offset, &up->m.offset))
-				return -EFAULT;
-			break;
 		case V4L2_MEMORY_DMABUF:
 			if (put_user(kp->m.fd, &up->m.fd))
 				return -EFAULT;