From f78ed2204db9fc35b545d693865bddbe0149aa1f Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Thu, 7 May 2020 09:32:21 -0700 Subject: netpoll: accept NULL np argument in netpoll_send_skb() netpoll_send_skb() callers seem to leak skb if the np pointer is NULL. While this should not happen, we can make the code more robust. Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller --- net/core/netpoll.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) (limited to 'net/core/netpoll.c') diff --git a/net/core/netpoll.c b/net/core/netpoll.c index 40d2753aa47d..093e90e52bc2 100644 --- a/net/core/netpoll.c +++ b/net/core/netpoll.c @@ -367,9 +367,14 @@ netdev_tx_t netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) unsigned long flags; netdev_tx_t ret; - local_irq_save(flags); - ret = __netpoll_send_skb(np, skb); - local_irq_restore(flags); + if (unlikely(!np)) { + dev_kfree_skb_irq(skb); + ret = NET_XMIT_DROP; + } else { + local_irq_save(flags); + ret = __netpoll_send_skb(np, skb); + local_irq_restore(flags); + } return ret; } EXPORT_SYMBOL(netpoll_send_skb); -- cgit v1.2.3