linux-kernel - Re: [PATCH v2 14/23] media: iris: Fix NULL pointer dereference

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Message-ID: <6f913d1a-bcbb-e620-a761-676e38bdd1b8@quicinc.com>
Date: Tue, 29 Apr 2025 16:01:17 +0530
From: Vikash Garodia <quic_vgarodia@...cinc.com>
To: Dikshita Agarwal <quic_dikshita@...cinc.com>,
        Abhinav Kumar
	<quic_abhinavk@...cinc.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Stefan Schmidt <stefan.schmidt@...aro.org>,
        Hans Verkuil
	<hverkuil@...all.nl>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio
	<konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski
	<krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>
CC: Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Dmitry Baryshkov
	<dmitry.baryshkov@....qualcomm.com>,
        Neil Armstrong
	<neil.armstrong@...aro.org>,
        Nicolas Dufresne
	<nicolas.dufresne@...labora.com>,
        <linux-media@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <20250417-topic-sm8x50-iris-v10-v7-0-f020cb1d0e98@...aro.org>,
        <20250424-qcs8300_iris-v5-0-f118f505c300@...cinc.com>,
        <stable@...r.kernel.org>, Dan Carpenter <dan.carpenter@...aro.org>
Subject: Re: [PATCH v2 14/23] media: iris: Fix NULL pointer dereference



On 4/28/2025 2:59 PM, Dikshita Agarwal wrote:
> A warning reported by smatch indicated a possible null pointer
> dereference where one of the arguments to API
> "iris_hfi_gen2_handle_system_error" could sometimes be null.
> 
> To fix this, add a check to validate that the argument passed is not
> null before accessing its members.
> 
> Cc: stable@...r.kernel.org
> Fixes: fb583a214337 ("media: iris: introduce host firmware interface with necessary hooks")
> Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
> Closes: https://lore.kernel.org/linux-media/634cc9b8-f099-4b54-8556-d879fb2b5169@stanley.mountain/
> Signed-off-by: Dikshita Agarwal <quic_dikshita@...cinc.com>
> ---
>  drivers/media/platform/qcom/iris/iris_hfi_gen2_response.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/qcom/iris/iris_hfi_gen2_response.c b/drivers/media/platform/qcom/iris/iris_hfi_gen2_response.c
> index 1ed798d31a3f..cba71b5db943 100644
> --- a/drivers/media/platform/qcom/iris/iris_hfi_gen2_response.c
> +++ b/drivers/media/platform/qcom/iris/iris_hfi_gen2_response.c
> @@ -267,7 +267,8 @@ static int iris_hfi_gen2_handle_system_error(struct iris_core *core,
>  {
>  	struct iris_inst *instance;
>  
> -	dev_err(core->dev, "received system error of type %#x\n", pkt->type);
> +	if (pkt)
> +		dev_err(core->dev, "received system error of type %#x\n", pkt->type);
>  
>  	core->state = IRIS_CORE_ERROR;
>  
> 
Acked-by: Vikash Garodia <quic_vgarodia@...cinc.com>