netdev - Re: Re: [PATCH net] [v2] sfc: fix a double-free bug in efx_probe

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Date: Mon, 25 Dec 2023 19:28:44 +0800 (GMT+08:00)
From: alexious@....edu.cn
To: "Simon Horman" <horms@...nel.org>
Cc: "Edward Cree" <ecree.xilinx@...il.com>, 
	"Martin Habets" <habetsm.xilinx@...il.com>, 
	"David S. Miller" <davem@...emloft.net>, 
	"Eric Dumazet" <edumazet@...gle.com>, 
	"Jakub Kicinski" <kuba@...nel.org>, 
	"Paolo Abeni" <pabeni@...hat.com>, netdev@...r.kernel.org, 
	linux-net-drivers@....com, linux-kernel@...r.kernel.org
Subject: Re: Re: [PATCH net] [v2] sfc: fix a double-free bug in
 efx_probe_filters

 
> On Fri, Dec 22, 2023 at 11:49:52PM +0800, Zhipeng Lu wrote:
> > In efx_probe_filters, the channel->rps_flow_id is freed in a
> > efx_for_each_channel marco  when success equals to 0.
> > However, after the following call chain:
> > 
> > ef100_net_open
> >   |-> efx_probe_filters
> >   |-> ef100_net_stop
> >         |-> efx_remove_filters
> > 
> > The channel->rps_flow_id is freed again in the efx_for_each_channel of
> > efx_remove_filters, triggering a double-free bug.
> > ---
> 
> Everything below the line above (---) will be omitted from the commit
> message when the patch is applied.
> 
> > Changelog:
> > 
> > v2: Correct the call-chain description in commit message and change
> > patch subject.
> > 
> > Fixes: a9dc3d5612ce ("sfc_ef100: RX filter table management and related gubbins")
> > Signed-off-by: Zhipeng Lu <alexious@....edu.cn>
> > Reviewed-by: Simon Horman <horms@...nel.org>
> > Reviewed-by: Edward Cree <ecree.xilinx@...il.com>
> 
> Hi Zhipeng Lu,
> 
> I think that your Signed-off-by should go last when you post a patch.
> 
> And the Changelog should go below the (first set of) scissors (---).
> 
> > ---
> >  drivers/net/ethernet/sfc/rx_common.c | 4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> With the above in mind, I think you want something like:
> 
> In efx_probe_filters, the channel->rps_flow_id is freed in a
> efx_for_each_channel marco  when success equals to 0.
> However, after the following call chain:
> 
> ef100_net_open
>   |-> efx_probe_filters
>   |-> ef100_net_stop
>         |-> efx_remove_filters
> 
> The channel->rps_flow_id is freed again in the efx_for_each_channel of
> efx_remove_filters, triggering a double-free bug.
> 
> Fixes: a9dc3d5612ce ("sfc_ef100: RX filter table management and related gubbins")
> Reviewed-by: Simon Horman <horms@...nel.org>
> Reviewed-by: Edward Cree <ecree.xilinx@...il.com>
> Signed-off-by: Zhipeng Lu <alexious@....edu.cn>
> ---
> Changelog:
> 
> v2: Correct the call-chain description in commit message and change
> patch subject.
> ---
>  drivers/net/ethernet/sfc/rx_common.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> -- 
> pw-bot: changes-requested

Thank you for your detailed revision and correction!
I'll send this patch again with your correction.