Patch "net: core: Prevent from dereferencing null pointer when releasing SKB" has been added to the 4.4-stable tree

Patch "net: core: Prevent from dereferencing null pointer when releasing SKB" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

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

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     net-core-prevent-from-dereferencing-null-pointer-when-releasing-skb.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Thu Oct  5 10:49:14 CEST 2017
From: Myungho Jung <mhjungk@gmail.com>
Date: Tue, 25 Apr 2017 11:58:15 -0700
Subject: net: core: Prevent from dereferencing null pointer when releasing SKB

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


Patches currently in stable-queue which might be from mhjungk@gmail.com are

queue-4.4/net-core-prevent-from-dereferencing-null-pointer-when-releasing-skb.patch