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

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Message-ID: <20231224155138.GA228041@kernel.org>
Date: Sun, 24 Dec 2023 15:51:38 +0000
From: Simon Horman <horms@...nel.org>
To: Zhipeng Lu <alexious@....edu.cn>
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: [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