[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Mon, 11 Nov 2019 19:28:06 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org,
Martin Hundebøll <martin@...nix.com>,
Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH 4.14 036/105] can: rx-offload: can_rx_offload_queue_sorted(): fix error handling, avoid skb mem leak
From: Marc Kleine-Budde <mkl@...gutronix.de>
commit ca913f1ac024559ebc17f0b599af262f0ad997c9 upstream.
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 <stable@...r.kernel.org>
Cc: Martin Hundebøll <martin@...nix.com>
Reported-by: Martin Hundebøll <martin@...nix.com>
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
drivers/net/can/rx-offload.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/drivers/net/can/rx-offload.c
+++ b/drivers/net/can/rx-offload.c
@@ -216,8 +216,10 @@ int can_rx_offload_queue_sorted(struct c
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;
Powered by blists - more mailing lists