linux-kernel - [PATCH 4.2.y-ckt 023/218] [media] media: v4l2-compat-ioctl32: fix missing length copy in put_v4l2

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Message-Id: <1459455431-12687-24-git-send-email-kamal@canonical.com>
Date:	Thu, 31 Mar 2016 13:13:56 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Tiffany Lin <tiffany.lin@...iatek.com>,
	Hans Verkuil <hans.verkuil@...co.com>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 4.2.y-ckt 023/218] [media] media: v4l2-compat-ioctl32: fix missing length copy in put_v4l2_buffer32

4.2.8-ckt7 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Tiffany Lin <tiffany.lin@...iatek.com>

commit 7df5ab8774aa383c6d2bff00688d004585d96dfd upstream.

In v4l2-compliance utility, test QUERYBUF required correct length
value to go through each planar to check planar's length in
multi-planar buffer type

Signed-off-by: Tiffany Lin <tiffany.lin@...iatek.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Signed-off-by: Hans Verkuil <hans.verkuil@...co.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@....samsung.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/media/v4l2-core/v4l2-compat-ioctl32.c | 21 ++++++++-------------
 1 file changed, 8 insertions(+), 13 deletions(-)

diff --git a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
index 788b31c..73138a3 100644
--- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
+++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
@@ -394,7 +394,8 @@ static int get_v4l2_buffer32(struct v4l2_buffer *kp, struct v4l2_buffer32 __user
 		get_user(kp->index, &up->index) ||
 		get_user(kp->type, &up->type) ||
 		get_user(kp->flags, &up->flags) ||
-		get_user(kp->memory, &up->memory))
+		get_user(kp->memory, &up->memory) ||
+		get_user(kp->length, &up->length))
 			return -EFAULT;
 
 	if (V4L2_TYPE_IS_OUTPUT(kp->type))
@@ -406,9 +407,6 @@ static int get_v4l2_buffer32(struct v4l2_buffer *kp, struct v4l2_buffer32 __user
 			return -EFAULT;
 
 	if (V4L2_TYPE_IS_MULTIPLANAR(kp->type)) {
-		if (get_user(kp->length, &up->length))
-			return -EFAULT;
-
 		num_planes = kp->length;
 		if (num_planes == 0) {
 			kp->m.planes = NULL;
@@ -441,16 +439,14 @@ static int get_v4l2_buffer32(struct v4l2_buffer *kp, struct v4l2_buffer32 __user
 	} else {
 		switch (kp->memory) {
 		case V4L2_MEMORY_MMAP:
-			if (get_user(kp->length, &up->length) ||
-				get_user(kp->m.offset, &up->m.offset))
+			if (get_user(kp->m.offset, &up->m.offset))
 				return -EFAULT;
 			break;
 		case V4L2_MEMORY_USERPTR:
 			{
 			compat_long_t tmp;
 
-			if (get_user(kp->length, &up->length) ||
-			    get_user(tmp, &up->m.userptr))
+			if (get_user(tmp, &up->m.userptr))
 				return -EFAULT;
 
 			kp->m.userptr = (unsigned long)compat_ptr(tmp);
@@ -492,7 +488,8 @@ static int put_v4l2_buffer32(struct v4l2_buffer *kp, struct v4l2_buffer32 __user
 		copy_to_user(&up->timecode, &kp->timecode, sizeof(struct v4l2_timecode)) ||
 		put_user(kp->sequence, &up->sequence) ||
 		put_user(kp->reserved2, &up->reserved2) ||
-		put_user(kp->reserved, &up->reserved))
+		put_user(kp->reserved, &up->reserved) ||
+		put_user(kp->length, &up->length))
 			return -EFAULT;
 
 	if (V4L2_TYPE_IS_MULTIPLANAR(kp->type)) {
@@ -515,13 +512,11 @@ static int put_v4l2_buffer32(struct v4l2_buffer *kp, struct v4l2_buffer32 __user
 	} else {
 		switch (kp->memory) {
 		case V4L2_MEMORY_MMAP:
-			if (put_user(kp->length, &up->length) ||
-				put_user(kp->m.offset, &up->m.offset))
+			if (put_user(kp->m.offset, &up->m.offset))
 				return -EFAULT;
 			break;
 		case V4L2_MEMORY_USERPTR:
-			if (put_user(kp->length, &up->length) ||
-				put_user(kp->m.userptr, &up->m.userptr))
+			if (put_user(kp->m.userptr, &up->m.userptr))
 				return -EFAULT;
 			break;
 		case V4L2_MEMORY_OVERLAY:
-- 
2.7.4