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can: rx-offload: can_rx_offload_queue_tail(): fix error handling, avoid skb mem leak

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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>
This commit is contained in:
Marc Kleine-Budde 2019-10-09 15:48:48 +02:00
parent ca913f1ac0
commit 6caf8a6d65
1 changed files with 4 additions and 2 deletions
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6
drivers/net/can/rx-offload.c
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@ -252,8 +252,10 @@ 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);