Merge tag 'linux-can-fixes-for-5.16-20220105' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can

Marc Kleine-Budde says:

====================
pull-request: can 2022-01-05

It consists of 2 patches, both by me. The first one fixes the use of
an uninitialized variable in the gs_usb driver the other one a
skb_over_panic in the ISOTP stack in case of reception of too large
ISOTP messages.

* tag 'linux-can-fixes-for-5.16-20220105' of git://git.kernel.org/pub/scm/linux/kernel/git/mkl/linux-can:
  can: isotp: convert struct tpcon::{idx,len} to unsigned int
  can: gs_usb: fix use of uninitialized variable, detach device on reception of invalid USB data
====================

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: kuba-moo

drivers/net/can/usb/gs_usb.c

@@ -321,7 +321,7 @@ static void gs_usb_receive_bulk_callback(struct urb *urb)
 
 	/* device reports out of range channel id */
 	if (hf->channel >= GS_MAX_INTF)
-		goto resubmit_urb;
+		goto device_detach;
 
 	dev = usbcan->canch[hf->channel];
 
@@ -406,6 +406,7 @@ static void gs_usb_receive_bulk_callback(struct urb *urb)
 
 	/* USB failure take down all interfaces */
 	if (rc == -ENODEV) {
+ device_detach:
 		for (rc = 0; rc < GS_MAX_INTF; rc++) {
 			if (usbcan->canch[rc])
 				netif_device_detach(usbcan->canch[rc]->netdev);

net/can/isotp.c

@@ -119,8 +119,8 @@ enum {
 };
 
 struct tpcon {
-	int idx;
-	int len;
+	unsigned int idx;
+	unsigned int len;
 	u32 state;
 	u8 bs;
 	u8 sn;