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Subject[PATCH 3.18 17/35] net: core: Prevent from dereferencing null pointer when releasing SKB
Date
3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Myungho Jung <mhjungk@gmail.com>


[ 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>
---
net/core/dev.c | 3 +++
1 file changed, 3 insertions(+)

--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2225,6 +2225,9 @@ void __dev_kfree_skb_irq(struct sk_buff
{
unsigned long flags;

+ if (unlikely(!skb))
+ return;
+
if (likely(atomic_read(&skb->users) == 1)) {
smp_rmb();
atomic_set(&skb->users, 0);

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