[media] media: v4l2-compat-ioctl32: fix missing length copy in put_v4l2_buffer32

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@mediatek.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Cc: <stable@vger.kernel.org>      # for v3.7 and up
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

diff --git a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
index 8fd84a67478a77423cc6bc051e0654276561502c..019644ff627d775f7f4b67e29b46baab9dadabbf 100644 (file)
--- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
+++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
@@ -415,7 +415,8 @@ 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))
@@ -427,9 +428,6 @@ 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;
@@ -462,16 +460,14 @@ 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);
@@ -513,7 +509,8 @@ 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)) {
@@ -536,13 +533,11 @@ 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: