From ca913f1ac024559ebc17f0b599af262f0ad997c9 Mon Sep 17 00:00:00 2001 From: Marc Kleine-Budde Date: Wed, 9 Oct 2019 15:48:48 +0200 Subject: [PATCH] can: rx-offload: can_rx_offload_queue_sorted(): fix error handling, avoid skb mem leak MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit If the rx-offload skb_queue is full can_rx_offload_queue_sorted() will not queue the skb and return with an error. None of the callers of this function, issue a kfree_skb() to free the not queued skb. This results in a memory leak. This patch fixes the problem by freeing the skb in case of a full queue. The return value is adjusted to -ENOBUFS to better reflect the actual problem. The device stats handling is left to the callers, as this function might be used in both the rx and tx path. Fixes: 55059f2b7f86 ("can: rx-offload: introduce can_rx_offload_get_echo_skb() and can_rx_offload_queue_sorted() functions") Cc: linux-stable Cc: Martin Hundebøll Reported-by: Martin Hundebøll Signed-off-by: Marc Kleine-Budde --- 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 e6a668ee7730..663697439d1c 100644 --- a/drivers/net/can/rx-offload.c +++ b/drivers/net/can/rx-offload.c @@ -207,8 +207,10 @@ int can_rx_offload_queue_sorted(struct can_rx_offload *offload, unsigned long flags; if (skb_queue_len(&offload->skb_queue) > - offload->skb_queue_len_max) - return -ENOMEM; + offload->skb_queue_len_max) { + kfree_skb(skb); + return -ENOBUFS; + } cb = can_rx_offload_get_cb(skb); cb->timestamp = timestamp; -- 2.11.0