linux-kernel - Re: [netlink] WARNING: at mm/vmalloc.c:1487 _

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Message-ID: <CAM_iQpWu2U5UmHhvmnqNenbWyz7vng8W+b0AssE31FSgSd9DLg@mail.gmail.com>
Date:	Sat, 15 Jun 2013 13:57:02 +0800
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	Fengguang Wu <fengguang.wu@...el.com>
Cc:	Pablo Neira Ayuso <pablo@...filter.org>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [netlink] WARNING: at mm/vmalloc.c:1487 __vunmap()

On Sat, Jun 15, 2013 at 6:01 AM, Fengguang Wu <fengguang.wu@...el.com> wrote:
> Greetings,
>
> I got the below dmesg and the first bad commit is
>
> commit c05cdb1b864f548c0c3d8ae3b51264e6739a69b1
> Author: Pablo Neira Ayuso <pablo@...filter.org>
> Date:   Mon Jun 3 09:46:28 2013 +0000
>
>     netlink: allow large data transfers from user-space

Hi, Fengguang,

Could you try the following quick fix?

diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 8978755..d8c6c03 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -750,7 +750,7 @@ static void netlink_skb_destructor(struct sk_buff *skb)
                skb->head = NULL;
        }
 #endif
-       if (is_vmalloc_addr(skb->head)) {
+       else if (is_vmalloc_addr(skb->head)) {
                vfree(skb->head);
                skb->head = NULL;
        }
--
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