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net: core: Prevent from dereferencing null pointer when releasing SKB

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Added NULL check to make __dev_kfree_skb_irq consistent with kfree
family of functions.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=195289

Signed-off-by: Myungho Jung <mhjungk@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Myungho Jung 2017-04-25 11:58:15 -07:00 committed by David S. Miller
parent 5294b83086
commit 9899886d5e
1 changed files with 3 additions and 0 deletions
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3
net/core/dev.c
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@ -2450,6 +2450,9 @@ void __dev_kfree_skb_irq(struct sk_buff *skb, enum skb_free_reason reason)
{
unsigned long flags;
if (unlikely(!skb))
return;
if (likely(atomic_read(&skb->users) == 1)) {
smp_rmb();
atomic_set(&skb->users, 0);