netdev - Re: [PATCH v3 1/3] can: dev: can_restart: fix use after free bug

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Date:   Wed, 20 Jan 2021 13:42:36 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Vincent Mailhol <mailhol.vincent@...adoo.fr>
Cc:     Marc Kleine-Budde <mkl@...gutronix.de>,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        linux-can@...r.kernel.org, netdev@...r.kernel.org,
        Wolfgang Grandegger <wg@...ndegger.com>,
        Stephane Grosjean <s.grosjean@...k-system.com>,
        Loris Fauster <loris.fauster@...ontrol.com>,
        Alejandro Concepcion Rodriguez <alejandro@...ro.eu>
Subject: Re: [PATCH v3 1/3] can: dev: can_restart: fix use after free bug

On Wed, Jan 20, 2021 at 07:24:41PM +0900, Vincent Mailhol wrote:
> After calling netif_rx_ni(skb), dereferencing skb is unsafe.
> Especially, the can_frame cf which aliases skb memory is accessed
> after the netif_rx_ni() in:
>       stats->rx_bytes += cf->len;
> 
> Reordering the lines solves the issue.
> 
> *Remark for upstream*
> drivers/net/can/dev.c has been moved to drivers/net/can/dev/dev.c in
> below commit, please carry the patch forward.
> Reference: 3e77f70e7345 ("can: dev: move driver related infrastructure
> into separate subdir")

Put these sorts of comments under the --- so that they aren't included
in the permanent git log.

> 
> Fixes: 39549eef3587 ("can: CAN Network device driver and Netlink interface")
> Signed-off-by: Vincent Mailhol <mailhol.vincent@...adoo.fr>
> ---
  ^^^

comment below this line are removed from the git log.

>  drivers/net/can/dev.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 

regards,
dan carpenter