Re: [PATCH] media/usb/siano: Fix endpoint type checking in smsusb

From: Alan Stern
Date: Sun Aug 18 2024 - 14:21:02 EST


Greg and Mauro:

Was this patch ever applied? It doesn't appear in the current -rc
kernel. Was there some confusion about which tree it should be merged
through?

Here's a link to the original submission:

https://lore.kernel.org/all/51b854da-f031-4a25-a19f-dac442d7bee2@xxxxxxxxxxxxxxxxxxx/

Alan Stern

On Wed, Jul 31, 2024 at 01:29:54PM -0400, Alan Stern wrote:
> The syzbot fuzzer reports that the smsusb driver doesn't check whether
> the endpoints it uses are actually Bulk:
>
> smsusb:smsusb_probe: board id=15, interface number 6
> smsusb:siano_media_device_register: media controller created
> ------------[ cut here ]------------
> usb 1-1: BOGUS urb xfer, pipe 3 != type 1
> WARNING: CPU: 0 PID: 42 at drivers/usb/core/urb.c:503 usb_submit_urb+0xe4b/0x1730 drivers/usb/core/urb.c:503
> ...
> Call Trace:
> <TASK>
> smsusb_submit_urb+0x288/0x410 drivers/media/usb/siano/smsusb.c:173
> smsusb_start_streaming drivers/media/usb/siano/smsusb.c:197 [inline]
> smsusb_init_device+0x856/0xe10 drivers/media/usb/siano/smsusb.c:477
> smsusb_probe+0x5e2/0x10b0 drivers/media/usb/siano/smsusb.c:575
>
> The problem can be fixed by checking the endpoints' types along with
> their directions.
>
> Signed-off-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
> Reported-by: syzbot+85e3ddbf0ddbfbc85f1e@xxxxxxxxxxxxxxxxxxxxxxxxx
> Tested-by: syzbot+85e3ddbf0ddbfbc85f1e@xxxxxxxxxxxxxxxxxxxxxxxxx
> Closes: https://lore.kernel.org/linux-usb/000000000000e45551061e558c37@xxxxxxxxxx/
> Fixes: 31e0456de5be ("media: usb: siano: Fix general protection fault in smsusb")
> Cc: <stable@xxxxxxxxxxxxxxx>
>
> ---
>
> drivers/media/usb/siano/smsusb.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> Index: usb-devel/drivers/media/usb/siano/smsusb.c
> ===================================================================
> --- usb-devel.orig/drivers/media/usb/siano/smsusb.c
> +++ usb-devel/drivers/media/usb/siano/smsusb.c
> @@ -410,10 +410,10 @@ static int smsusb_init_device(struct usb
> struct usb_endpoint_descriptor *desc =
> &intf->cur_altsetting->endpoint[i].desc;
>
> - if (desc->bEndpointAddress & USB_DIR_IN) {
> + if (usb_endpoint_is_bulk_in(desc)) {
> dev->in_ep = desc->bEndpointAddress;
> align = usb_endpoint_maxp(desc) - sizeof(struct sms_msg_hdr);
> - } else {
> + } else if (usb_endpoint_is_bulk_out(desc)) {
> dev->out_ep = desc->bEndpointAddress;
> }
> }