V4L/DVB (8617): uvcvideo: don't use stack-based buffers for USB transfers.

Data buffers on the stack are not allowed for USB I/O. Use dynamically
allocated buffers instead.

Signed-off-by: Bruce Schmid <duck@freescale.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@skynet.be>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

2 files changed, 43 insertions, 23 deletions

diff --git a/drivers/media/video/uvc/uvc_ctrl.c b/drivers/media/video/uvc/uvc_ctrl.c
index 626f4ad7e876..6ef3e5297de8 100644
--- a/drivers/media/video/uvc/uvc_ctrl.c
+++ b/drivers/media/video/uvc/uvc_ctrl.c
@@ -585,13 +585,17 @@ int uvc_query_v4l2_ctrl(struct uvc_video_device *video,
         struct uvc_control_mapping *mapping;
         struct uvc_menu_info *menu;
         unsigned int i;
-        __u8 data[8];
+        __u8 *data;
         int ret;
 
         ctrl = uvc_find_control(video, v4l2_ctrl->id, &mapping);
         if (ctrl == NULL)
                 return -EINVAL;
 
+        data = kmalloc(8, GFP_KERNEL);
+        if (data == NULL)
+                return -ENOMEM;
+
         memset(v4l2_ctrl, 0, sizeof *v4l2_ctrl);
         v4l2_ctrl->id = mapping->id;
         v4l2_ctrl->type = mapping->v4l2_type;
@@ -604,8 +608,8 @@ int uvc_query_v4l2_ctrl(struct uvc_video_device *video,
         if (ctrl->info->flags & UVC_CONTROL_GET_DEF) {
                 if ((ret = uvc_query_ctrl(video->dev, GET_DEF, ctrl->entity->id,
                                 video->dev->intfnum, ctrl->info->selector,
-                                &data, ctrl->info->size)) < 0)
-                        return ret;
+                                data, ctrl->info->size)) < 0)
+                        goto out;
                 v4l2_ctrl->default_value = uvc_get_le_value(data, mapping);
         }
 
@@ -623,13 +627,15 @@ int uvc_query_v4l2_ctrl(struct uvc_video_device *video,
                         }
                 }
 
-                return 0;
+                ret = 0;
+                goto out;
 
         case V4L2_CTRL_TYPE_BOOLEAN:
                 v4l2_ctrl->minimum = 0;
                 v4l2_ctrl->maximum = 1;
                 v4l2_ctrl->step = 1;
-                return 0;
+                ret = 0;
+                goto out;
 
         default:
                 break;
@@ -638,26 +644,29 @@ int uvc_query_v4l2_ctrl(struct uvc_video_device *video,
         if (ctrl->info->flags & UVC_CONTROL_GET_MIN) {
                 if ((ret = uvc_query_ctrl(video->dev, GET_MIN, ctrl->entity->id,
                                 video->dev->intfnum, ctrl->info->selector,
-                                &data, ctrl->info->size)) < 0)
-                        return ret;
+                                data, ctrl->info->size)) < 0)
+                        goto out;
                 v4l2_ctrl->minimum = uvc_get_le_value(data, mapping);
         }
         if (ctrl->info->flags & UVC_CONTROL_GET_MAX) {
                 if ((ret = uvc_query_ctrl(video->dev, GET_MAX, ctrl->entity->id,
                                 video->dev->intfnum, ctrl->info->selector,
-                                &data, ctrl->info->size)) < 0)
-                        return ret;
+                                data, ctrl->info->size)) < 0)
+                        goto out;
                 v4l2_ctrl->maximum = uvc_get_le_value(data, mapping);
         }
         if (ctrl->info->flags & UVC_CONTROL_GET_RES) {
                 if ((ret = uvc_query_ctrl(video->dev, GET_RES, ctrl->entity->id,
                                 video->dev->intfnum, ctrl->info->selector,
-                                &data, ctrl->info->size)) < 0)
-                        return ret;
+                                data, ctrl->info->size)) < 0)
+                        goto out;
                 v4l2_ctrl->step = uvc_get_le_value(data, mapping);
         }
 
-        return 0;
+        ret = 0;
+out:
+        kfree(data);
+        return ret;
 }
 
 
diff --git a/drivers/media/video/uvc/uvc_video.c b/drivers/media/video/uvc/uvc_video.c
index ad63794fda77..6854ac78a161 100644
--- a/drivers/media/video/uvc/uvc_video.c
+++ b/drivers/media/video/uvc/uvc_video.c
@@ -90,17 +90,20 @@ static void uvc_fixup_buffer_size(struct uvc_video_device *video,
 static int uvc_get_video_ctrl(struct uvc_video_device *video,
         struct uvc_streaming_control *ctrl, int probe, __u8 query)
 {
-        __u8 data[34];
-        __u8 size;
+        __u8 *data;
+        __u16 size;
         int ret;
 
         size = video->dev->uvc_version >= 0x0110 ? 34 : 26;
+        data = kmalloc(size, GFP_KERNEL);
+        if (data == NULL)
+                return -ENOMEM;
+
         ret = __uvc_query_ctrl(video->dev, query, 0, video->streaming->intfnum,
-                probe ? VS_PROBE_CONTROL : VS_COMMIT_CONTROL, &data, size,
+                probe ? VS_PROBE_CONTROL : VS_COMMIT_CONTROL, data, size,
                 UVC_CTRL_STREAMING_TIMEOUT);
-
         if (ret < 0)
-                return ret;
+                goto out;
 
         ctrl->bmHint = le16_to_cpup((__le16 *)&data[0]);
         ctrl->bFormatIndex = data[2];
@@ -136,17 +139,22 @@ static int uvc_get_video_ctrl(struct uvc_video_device *video,
          */
         uvc_fixup_buffer_size(video, ctrl);
 
-        return 0;
+out:
+        kfree(data);
+        return ret;
 }
 
 int uvc_set_video_ctrl(struct uvc_video_device *video,
         struct uvc_streaming_control *ctrl, int probe)
 {
-        __u8 data[34];
-        __u8 size;
+        __u8 *data;
+        __u16 size;
+        int ret;
 
         size = video->dev->uvc_version >= 0x0110 ? 34 : 26;
-        memset(data, 0, sizeof data);
+        data = kzalloc(size, GFP_KERNEL);
+        if (data == NULL)
+                return -ENOMEM;
 
         *(__le16 *)&data[0] = cpu_to_le16(ctrl->bmHint);
         data[2] = ctrl->bFormatIndex;
@@ -174,10 +182,13 @@ int uvc_set_video_ctrl(struct uvc_video_device *video,
                 data[33] = ctrl->bMaxVersion;
         }
 
-        return __uvc_query_ctrl(video->dev, SET_CUR, 0,
+        ret = __uvc_query_ctrl(video->dev, SET_CUR, 0,
                 video->streaming->intfnum,
-                probe ? VS_PROBE_CONTROL : VS_COMMIT_CONTROL, &data, size,
+                probe ? VS_PROBE_CONTROL : VS_COMMIT_CONTROL, data, size,
                 UVC_CTRL_STREAMING_TIMEOUT);
+
+        kfree(data);
+        return ret;
 }
 
 int uvc_probe_video(struct uvc_video_device *video,