From: Marek Lindner <lindner_marek@yahoo.de>
To: The list for a Better Approach To Mobile Ad-hoc Networking
<b.a.t.m.a.n@lists.open-mesh.org>
Subject: Re: [B.A.T.M.A.N.] [PATCH next 2/2] batman-adv: fix potential kernel paging error for unicast transmissions
Date: Fri, 2 Aug 2013 12:05:28 +0800 [thread overview]
Message-ID: <201308021205.28767.lindner_marek@yahoo.de> (raw)
In-Reply-To: <cec8de3ff4ea6c6853536d1b32dc7352@autistici.org>
On Monday, July 29, 2013 04:17:57 Antonio Quartulli wrote:
> Il 27.07.2013 03:24 Linus Lüssing ha scritto:
> > batadv_send_skb_prepare_unicast(_4addr) might reallocate the skb's
> > data. If it does then our ethhdr pointer is not valid anymore in
> > batadv_send_skb_unicast(), resulting in a kernel paging error.
> >
> > This patch fixes this issue by storing the few bytes we are interested
> > in on the stack before modifying the skb.
>
> Good fix! thanks!
>
>
> However, I think it would be nice to send another patch aiming master
> which could polish this situation a bit better: e.g. by calling
> skb_reset_mac_header() in the batadv_send_skb_prepare_unicast_*
> functions and then get the Ethernet header with eth_hdr() right after
> having changed the skb.
I like that approach because it seems cleaner that way. Is there a reason not
do it right away ?
Cheers,
Marek
next prev parent reply other threads:[~2013-08-02 4:05 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-27 1:24 [B.A.T.M.A.N.] [PATCH next 1/2] batman-adv: check return type of unicast packet preparations Linus Lüssing
2013-07-27 1:24 ` [B.A.T.M.A.N.] [PATCH next 2/2] batman-adv: fix potential kernel paging error for unicast transmissions Linus Lüssing
2013-07-28 20:17 ` Antonio Quartulli
2013-08-02 4:05 ` Marek Lindner [this message]
2013-08-02 7:18 ` Antonio Quartulli
2013-08-02 8:04 ` Linus Lüssing
2013-07-28 20:14 ` [B.A.T.M.A.N.] [PATCH next 1/2] batman-adv: check return type of unicast packet preparations Antonio Quartulli
2013-08-02 4:02 ` Marek Lindner
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