linux-kernel - Re: [PATCH] nfc: st-nci: Fix use after free bug in ndlc

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Date:   Mon, 13 Mar 2023 07:52:13 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Zheng Wang <zyytlz.wz@....com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        hackerzheng666@...il.com, 1395428693sheep@...il.com,
        alex000young@...il.com
Subject: Re: [PATCH] nfc: st-nci: Fix use after free bug in ndlc_remove due to
 race condition

On 12/03/2023 17:08, Zheng Wang wrote:
> This bug influences both st_nci_i2c_remove and st_nci_spi_remove.
> Take st_nci_i2c_remove as an example.
> 
> In st_nci_i2c_probe, it called ndlc_probe and bound &ndlc->sm_work
> with llt_ndlc_sm_work.
> 
> When it calls ndlc_recv or timeout handler, it will finally call
> schedule_work to start the work.
> 
> When we call st_nci_i2c_remove to remove the driver, there
> may be a sequence as follows:
> 
> Fix it by finishing the work before cleanup in ndlc_remove


Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>

Best regards,
Krzysztof