can: rx-offload: can_rx_offload_offload_one(): do not increase the skb_queue beyond...
authorMarc Kleine-Budde <mkl@pengutronix.de>
Wed, 9 Oct 2019 14:03:18 +0000 (16:03 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 5 Dec 2019 14:37:00 +0000 (15:37 +0100)
commitb3cc7954719dfdc37d14bab5377d74de73630316
treeeae139e7b04e3a85a45b5b843d4ca46fd1ce6f1b
parent37d45825181d0481f7f1e9eb87e899f3e9826408
can: rx-offload: can_rx_offload_offload_one(): do not increase the skb_queue beyond skb_queue_len_max

[ Upstream commit a2dc3f5e1022a5ede8af9ab89a144f1e69db8636 ]

The skb_queue is a linked list, holding the skb to be processed in the
next NAPI call.

Without this patch, the queue length in can_rx_offload_offload_one() is
limited to skb_queue_len_max + 1. As the skb_queue is a linked list, no
array or other resources are accessed out-of-bound, however this
behaviour is counterintuitive.

This patch limits the rx-offload skb_queue length to skb_queue_len_max.

Fixes: d254586c3453 ("can: rx-offload: Add support for HW fifo based irq offloading")
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
drivers/net/can/rx-offload.c