[PATCH 4.19 028/321] can: rx-offload: can_rx_offload_queue_tail(): fix error handling, avoid skb mem leak

Greg Kroah-Hartman
2019-12-03T22:46:25Z

From: Marc Kleine-Budde <mkl@pengutronix.de>

[ Upstream commit 6caf8a6d6586d44fd72f4aa1021d14aa82affafb ]

If the rx-offload skb_queue is full can_rx_offload_queue_tail() will not
queue the skb and return with an error.

This patch frees the skb in case of a full queue, which brings
can_rx_offload_queue_tail() in line with the
can_rx_offload_queue_sorted() function, which has been adjusted in the
previous patch.

The return value is adjusted to -ENOBUFS to better reflect the actual
problem.

The device stats handling is left to the caller.

Fixes: d254586c3453 ("can: rx-offload: Add support for HW fifo based irq offloading")
Reported-by: Kurt Van Dijck <dev.kurt@vandijck-laurijssen.be>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/can/rx-offload.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/can/rx-offload.c b/drivers/net/can/rx-offload.c
index 6cf0d0bc1e8d6..a90005eac8b17 100644
--- a/drivers/net/can/rx-offload.c
+++ b/drivers/net/can/rx-offload.c
@@ -261,8 +261,10 @@ int can_rx_offload_queue_tail(struct can_rx_offload *offload,
struct sk_buff *skb)
{
if (skb_queue_len(&offload->skb_queue) >
- offload->skb_queue_len_max)
- return -ENOMEM;
+ offload->skb_queue_len_max) {
+ kfree_skb(skb);
+ return -ENOBUFS;
+ }

skb_queue_tail(&offload->skb_queue, skb);
can_rx_offload_schedule(offload);
--
2.20.1