linux-kernel - Re: [PATCH] sfc: fix a double-free bug in efx_probe

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Message-ID: <20231216155145.GN6288@kernel.org>
Date: Sat, 16 Dec 2023 15:51:45 +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] sfc: fix a double-free bug in efx_probe_filters

On Thu, Dec 14, 2023 at 11:22:46PM +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:
> 
> efx_probe_filters
>   |-> ef100_net_open
>         |-> ef100_net_stop
>               |-> efx_remove_filters

I think the call chain may be a bit more like:

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")
> Signed-off-by: Zhipeng Lu <alexious@....edu.cn>

The above nit not withstanding, I agree with your reasoning.
And that the problem was introduced in the cited commit.

Reviewed-by: Simon Horman <horms@...nel.org>

...