diff options
| -rw-r--r-- | drivers/media/usb/uvc/uvc_driver.c | 63 |
1 files changed, 39 insertions, 24 deletions
diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c index f3f91635d67b..5770d901a5b8 100644 --- a/drivers/media/usb/uvc/uvc_driver.c +++ b/drivers/media/usb/uvc/uvc_driver.c @@ -1029,14 +1029,27 @@ error: return ret; } -static struct uvc_entity *uvc_alloc_entity(u16 type, u8 id, - unsigned int num_pads, unsigned int extra_size) +static struct uvc_entity *uvc_alloc_new_entity(struct uvc_device *dev, u16 type, + u16 id, unsigned int num_pads, + unsigned int extra_size) { struct uvc_entity *entity; unsigned int num_inputs; unsigned int size; unsigned int i; + /* Per UVC 1.1+ spec 3.7.2, the ID should be non-zero. */ + if (id == 0) { + dev_err(&dev->udev->dev, "Found Unit with invalid ID 0.\n"); + return ERR_PTR(-EINVAL); + } + + /* Per UVC 1.1+ spec 3.7.2, the ID is unique. */ + if (uvc_entity_by_id(dev, id)) { + dev_err(&dev->udev->dev, "Found multiple Units with ID %u\n", id); + return ERR_PTR(-EINVAL); + } + extra_size = roundup(extra_size, sizeof(*entity->pads)); if (num_pads) num_inputs = type & UVC_TERM_OUTPUT ? num_pads : num_pads - 1; @@ -1046,7 +1059,7 @@ static struct uvc_entity *uvc_alloc_entity(u16 type, u8 id, + num_inputs; entity = kzalloc(size, GFP_KERNEL); if (entity == NULL) - return NULL; + return ERR_PTR(-ENOMEM); entity->id = id; entity->type = type; @@ -1117,10 +1130,10 @@ static int uvc_parse_vendor_control(struct uvc_device *dev, break; } - unit = uvc_alloc_entity(UVC_VC_EXTENSION_UNIT, buffer[3], - p + 1, 2*n); - if (unit == NULL) - return -ENOMEM; + unit = uvc_alloc_new_entity(dev, UVC_VC_EXTENSION_UNIT, + buffer[3], p + 1, 2 * n); + if (IS_ERR(unit)) + return PTR_ERR(unit); memcpy(unit->extension.guidExtensionCode, &buffer[4], 16); unit->extension.bNumControls = buffer[20]; @@ -1231,10 +1244,10 @@ static int uvc_parse_standard_control(struct uvc_device *dev, return -EINVAL; } - term = uvc_alloc_entity(type | UVC_TERM_INPUT, buffer[3], - 1, n + p); - if (term == NULL) - return -ENOMEM; + term = uvc_alloc_new_entity(dev, type | UVC_TERM_INPUT, + buffer[3], 1, n + p); + if (IS_ERR(term)) + return PTR_ERR(term); if (UVC_ENTITY_TYPE(term) == UVC_ITT_CAMERA) { term->camera.bControlSize = n; @@ -1290,10 +1303,10 @@ static int uvc_parse_standard_control(struct uvc_device *dev, return 0; } - term = uvc_alloc_entity(type | UVC_TERM_OUTPUT, buffer[3], - 1, 0); - if (term == NULL) - return -ENOMEM; + term = uvc_alloc_new_entity(dev, type | UVC_TERM_OUTPUT, + buffer[3], 1, 0); + if (IS_ERR(term)) + return PTR_ERR(term); memcpy(term->baSourceID, &buffer[7], 1); @@ -1314,9 +1327,10 @@ static int uvc_parse_standard_control(struct uvc_device *dev, return -EINVAL; } - unit = uvc_alloc_entity(buffer[2], buffer[3], p + 1, 0); - if (unit == NULL) - return -ENOMEM; + unit = uvc_alloc_new_entity(dev, buffer[2], buffer[3], + p + 1, 0); + if (IS_ERR(unit)) + return PTR_ERR(unit); memcpy(unit->baSourceID, &buffer[5], p); @@ -1338,9 +1352,9 @@ static int uvc_parse_standard_control(struct uvc_device *dev, return -EINVAL; } - unit = uvc_alloc_entity(buffer[2], buffer[3], 2, n); - if (unit == NULL) - return -ENOMEM; + unit = uvc_alloc_new_entity(dev, buffer[2], buffer[3], 2, n); + if (IS_ERR(unit)) + return PTR_ERR(unit); memcpy(unit->baSourceID, &buffer[4], 1); unit->processing.wMaxMultiplier = @@ -1369,9 +1383,10 @@ static int uvc_parse_standard_control(struct uvc_device *dev, return -EINVAL; } - unit = uvc_alloc_entity(buffer[2], buffer[3], p + 1, n); - if (unit == NULL) - return -ENOMEM; + unit = uvc_alloc_new_entity(dev, buffer[2], buffer[3], + p + 1, n); + if (IS_ERR(unit)) + return PTR_ERR(unit); memcpy(unit->extension.guidExtensionCode, &buffer[4], 16); unit->extension.bNumControls = buffer[20]; |