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author | Guenter Roeck <linux@roeck-us.net> | 2022-10-25 16:41:01 +0200 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-03-11 16:44:14 +0100 |
commit | e4c535eccefb4da2aaa7bedd3a8ff22dfd344678 (patch) | |
tree | 5ea147bb71dc497d32b9f1cdbda4723ca83506bc | |
parent | 4e4e6ca62e77539d4df8d13137e2683b10baddd9 (diff) | |
download | linux-stable-e4c535eccefb4da2aaa7bedd3a8ff22dfd344678.tar.gz linux-stable-e4c535eccefb4da2aaa7bedd3a8ff22dfd344678.tar.bz2 linux-stable-e4c535eccefb4da2aaa7bedd3a8ff22dfd344678.zip |
media: uvcvideo: Handle errors from calls to usb_string
[ Upstream commit 4867bb590ae445bcfaa711a86b603c97e94574b3 ]
On a Webcam from Quanta, we see the following error.
usb 3-5: New USB device found, idVendor=0408, idProduct=30d2, bcdDevice= 0.03
usb 3-5: New USB device strings: Mfr=3, Product=1, SerialNumber=2
usb 3-5: Product: USB2.0 HD UVC WebCam
usb 3-5: Manufacturer: Quanta
usb 3-5: SerialNumber: 0x0001
...
uvcvideo: Found UVC 1.10 device USB2.0 HD UVC WebCam (0408:30d2)
uvcvideo: Failed to initialize entity for entity 5
uvcvideo: Failed to register entities (-22).
The Webcam reports an entity of type UVC_VC_EXTENSION_UNIT. It reports a
string index of '7' associated with that entity. The attempt to read that
string from the camera fails with error -32 (-EPIPE). usb_string() returns
that error, but it is ignored. As result, the entity name is empty. This
later causes v4l2_device_register_subdev() to return -EINVAL, and no
entities are registered as result.
While this appears to be a firmware problem with the camera, the kernel
should still handle the situation gracefully. To do that, check the return
value from usb_string(). If it reports an error, assign the entity's
default name.
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
-rw-r--r-- | drivers/media/usb/uvc/uvc_driver.c | 48 |
1 files changed, 19 insertions, 29 deletions
diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c index 40ca1d4e0348..f6c48f22c672 100644 --- a/drivers/media/usb/uvc/uvc_driver.c +++ b/drivers/media/usb/uvc/uvc_driver.c @@ -1060,10 +1060,8 @@ static int uvc_parse_vendor_control(struct uvc_device *dev, + n; memcpy(unit->extension.bmControls, &buffer[23+p], 2*n); - if (buffer[24+p+2*n] != 0) - usb_string(udev, buffer[24+p+2*n], unit->name, - sizeof(unit->name)); - else + if (buffer[24+p+2*n] == 0 || + usb_string(udev, buffer[24+p+2*n], unit->name, sizeof(unit->name)) < 0) sprintf(unit->name, "Extension %u", buffer[3]); list_add_tail(&unit->list, &dev->entities); @@ -1188,15 +1186,15 @@ static int uvc_parse_standard_control(struct uvc_device *dev, memcpy(term->media.bmTransportModes, &buffer[10+n], p); } - if (buffer[7] != 0) - usb_string(udev, buffer[7], term->name, - sizeof(term->name)); - else if (UVC_ENTITY_TYPE(term) == UVC_ITT_CAMERA) - sprintf(term->name, "Camera %u", buffer[3]); - else if (UVC_ENTITY_TYPE(term) == UVC_ITT_MEDIA_TRANSPORT_INPUT) - sprintf(term->name, "Media %u", buffer[3]); - else - sprintf(term->name, "Input %u", buffer[3]); + if (buffer[7] == 0 || + usb_string(udev, buffer[7], term->name, sizeof(term->name)) < 0) { + if (UVC_ENTITY_TYPE(term) == UVC_ITT_CAMERA) + sprintf(term->name, "Camera %u", buffer[3]); + if (UVC_ENTITY_TYPE(term) == UVC_ITT_MEDIA_TRANSPORT_INPUT) + sprintf(term->name, "Media %u", buffer[3]); + else + sprintf(term->name, "Input %u", buffer[3]); + } list_add_tail(&term->list, &dev->entities); break; @@ -1228,10 +1226,8 @@ static int uvc_parse_standard_control(struct uvc_device *dev, memcpy(term->baSourceID, &buffer[7], 1); - if (buffer[8] != 0) - usb_string(udev, buffer[8], term->name, - sizeof(term->name)); - else + if (buffer[8] == 0 || + usb_string(udev, buffer[8], term->name, sizeof(term->name)) < 0) sprintf(term->name, "Output %u", buffer[3]); list_add_tail(&term->list, &dev->entities); @@ -1253,10 +1249,8 @@ static int uvc_parse_standard_control(struct uvc_device *dev, memcpy(unit->baSourceID, &buffer[5], p); - if (buffer[5+p] != 0) - usb_string(udev, buffer[5+p], unit->name, - sizeof(unit->name)); - else + if (buffer[5+p] == 0 || + usb_string(udev, buffer[5+p], unit->name, sizeof(unit->name)) < 0) sprintf(unit->name, "Selector %u", buffer[3]); list_add_tail(&unit->list, &dev->entities); @@ -1286,10 +1280,8 @@ static int uvc_parse_standard_control(struct uvc_device *dev, if (dev->uvc_version >= 0x0110) unit->processing.bmVideoStandards = buffer[9+n]; - if (buffer[8+n] != 0) - usb_string(udev, buffer[8+n], unit->name, - sizeof(unit->name)); - else + if (buffer[8+n] == 0 || + usb_string(udev, buffer[8+n], unit->name, sizeof(unit->name)) < 0) sprintf(unit->name, "Processing %u", buffer[3]); list_add_tail(&unit->list, &dev->entities); @@ -1317,10 +1309,8 @@ static int uvc_parse_standard_control(struct uvc_device *dev, unit->extension.bmControls = (u8 *)unit + sizeof(*unit); memcpy(unit->extension.bmControls, &buffer[23+p], n); - if (buffer[23+p+n] != 0) - usb_string(udev, buffer[23+p+n], unit->name, - sizeof(unit->name)); - else + if (buffer[23+p+n] == 0 || + usb_string(udev, buffer[23+p+n], unit->name, sizeof(unit->name)) < 0) sprintf(unit->name, "Extension %u", buffer[3]); list_add_tail(&unit->list, &dev->entities); |