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

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[ Upstream commit 9899886d5e8ec5b343b1efe44f185a0e68dc6454 ]

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>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Myungho Jung 2017-04-25 11:58:15 -07:00 committed by Greg Kroah-Hartman
parent 4e6cdc0a7d
commit b9ff317b5c
1 changed files with 3 additions and 0 deletions

3
net/core/dev.c

@ -2338,6 +2338,9 @@ 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);