netdev - RE: [PATCH net 2/3] ixgbe: avoid premature Rx buffer reuse

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Message-ID: <6356c0ddbdbd4f8fb4927f3ee96c4c33@baidu.com>
Date:   Tue, 25 Aug 2020 09:55:44 +0000
From:   "Li,Rongqing" <lirongqing@...du.com>
To:     Björn Töpel <bjorn.topel@...il.com>,
        "jeffrey.t.kirsher@...el.com" <jeffrey.t.kirsher@...el.com>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>
CC:     Björn Töpel <bjorn.topel@...el.com>,
        "magnus.karlsson@...el.com" <magnus.karlsson@...el.com>,
        "magnus.karlsson@...il.com" <magnus.karlsson@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "maciej.fijalkowski@...el.com" <maciej.fijalkowski@...el.com>,
        "piotr.raczynski@...el.com" <piotr.raczynski@...el.com>,
        "maciej.machnikowski@...el.com" <maciej.machnikowski@...el.com>
Subject: RE: [PATCH net 2/3] ixgbe: avoid premature Rx buffer reuse



> -----Original Message-----
> From: Björn Töpel [mailto:bjorn.topel@...il.com]
> Sent: Tuesday, August 25, 2020 5:16 PM
> To: jeffrey.t.kirsher@...el.com; intel-wired-lan@...ts.osuosl.org
> Cc: Björn Töpel <bjorn.topel@...el.com>; magnus.karlsson@...el.com;
> magnus.karlsson@...il.com; netdev@...r.kernel.org;
> maciej.fijalkowski@...el.com; piotr.raczynski@...el.com;
> maciej.machnikowski@...el.com; Li,Rongqing <lirongqing@...du.com>
> Subject: [PATCH net 2/3] ixgbe: avoid premature Rx buffer reuse
> 
> From: Björn Töpel <bjorn.topel@...el.com>
> 
> The page recycle code, incorrectly, relied on that a page fragment could not be
> freed inside xdp_do_redirect(). This assumption leads to that page fragments
> that are used by the stack/XDP redirect can be reused and overwritten.
> 
> To avoid this, store the page count prior invoking xdp_do_redirect().
> 
> Fixes: 6453073987ba ("ixgbe: add initial support for xdp redirect")
> Signed-off-by: Björn Töpel <bjorn.topel@...el.com>

Reported-and-analyzed-by: Li RongQing <lirongqing@...du.com>

Thanks

-Li