6.12-stable review patch. If anyone has any objections, please let me know.
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From: Marc Kleine-Budde mkl@pengutronix.de
[ Upstream commit 6fe9f3279f7d2518439a7962c5870c6e9ecbadcf ]
The driver expects to receive a struct gs_host_frame in gs_usb_receive_bulk_callback().
Use struct_group to describe the header of the struct gs_host_frame and check that we have at least received the header before accessing any members of it.
To resubmit the URB, do not dereference the pointer chain "dev->parent->hf_size_rx" but use "parent->hf_size_rx" instead. Since "urb->context" contains "parent", it is always defined, while "dev" is not defined if the URB it too short.
Fixes: d08e973a77d1 ("can: gs_usb: Added support for the GS_USB CAN devices") Link: https://patch.msgid.link/20251114-gs_usb-fix-usb-callbacks-v1-2-a29b42eacada... Signed-off-by: Marc Kleine-Budde mkl@pengutronix.de Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/can/usb/gs_usb.c | 26 +++++++++++++++++++------- 1 file changed, 19 insertions(+), 7 deletions(-)
diff --git a/drivers/net/can/usb/gs_usb.c b/drivers/net/can/usb/gs_usb.c index fd34945d831e9..b2cfdc3558a5a 100644 --- a/drivers/net/can/usb/gs_usb.c +++ b/drivers/net/can/usb/gs_usb.c @@ -259,13 +259,15 @@ struct canfd_quirk { } __packed;
struct gs_host_frame { - u32 echo_id; - __le32 can_id; + struct_group(header, + u32 echo_id; + __le32 can_id;
- u8 can_dlc; - u8 channel; - u8 flags; - u8 reserved; + u8 can_dlc; + u8 channel; + u8 flags; + u8 reserved; + );
union { DECLARE_FLEX_ARRAY(struct classic_can, classic_can); @@ -573,6 +575,7 @@ static void gs_usb_receive_bulk_callback(struct urb *urb) int rc; struct net_device_stats *stats; struct gs_host_frame *hf = urb->transfer_buffer; + unsigned int minimum_length; struct gs_tx_context *txc; struct can_frame *cf; struct canfd_frame *cfd; @@ -591,6 +594,15 @@ static void gs_usb_receive_bulk_callback(struct urb *urb) return; }
+ minimum_length = sizeof(hf->header); + if (urb->actual_length < minimum_length) { + dev_err_ratelimited(&parent->udev->dev, + "short read (actual_length=%u, minimum_length=%u)\n", + urb->actual_length, minimum_length); + + goto resubmit_urb; + } + /* device reports out of range channel id */ if (hf->channel >= parent->channel_cnt) goto device_detach; @@ -684,7 +696,7 @@ static void gs_usb_receive_bulk_callback(struct urb *urb) resubmit_urb: usb_fill_bulk_urb(urb, parent->udev, parent->pipe_in, - hf, dev->parent->hf_size_rx, + hf, parent->hf_size_rx, gs_usb_receive_bulk_callback, parent);
rc = usb_submit_urb(urb, GFP_ATOMIC);