linux-kernel - Re: [PATCH 1/2] firmware: qcom: scm: fix a NULL-pointer dereference

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Message-ID: <3ef933cf-af58-4d0e-8e81-69ec5d0bd65a@gmail.com>
Date: Mon, 9 Sep 2024 23:45:43 -0700
From: Rudraksha Gupta <guptarud@...il.com>
To: Bartosz Golaszewski <brgl@...ev.pl>,
 Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>, Andrew Halaney
 <ahalaney@...hat.com>, Elliot Berman <quic_eberman@...cinc.com>,
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
 "Linux regression tracking (Thorsten Leemhuis)" <regressions@...mhuis.info>
Cc: linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH 1/2] firmware: qcom: scm: fix a NULL-pointer dereference


On 9/9/24 11:38, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
>
> Some SCM calls can be invoked with __scm being NULL (the driver may not
> have been and will not be probed as there's no SCM entry in device-tree).
> Make sure we don't dereference a NULL pointer.
>
> Fixes: 449d0d84bcd8 ("firmware: qcom: scm: smc: switch to using the SCM allocator")
> Reported-by: Rudraksha Gupta <guptarud@...il.com>
> Closes: https://lore.kernel.org/lkml/692cfe9a-8c05-4ce4-813e-82b3f310019a@gmail.com/
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> ---
>   drivers/firmware/qcom/qcom_scm.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c
> index 10986cb11ec0..8bac4915c211 100644
> --- a/drivers/firmware/qcom/qcom_scm.c
> +++ b/drivers/firmware/qcom/qcom_scm.c
> @@ -216,7 +216,7 @@ static DEFINE_SPINLOCK(scm_query_lock);
>   
>   struct qcom_tzmem_pool *qcom_scm_get_tzmem_pool(void)
>   {
> -	return __scm->mempool;
> +	return __scm ? __scm->mempool : NULL;
>   }
>   
>   static enum qcom_scm_convention __get_convention(void)


Tested-by: Rudraksha Gupta <guptarud@...il.com>