linux-kernel - Re: [PATCH] drm/msm/dpu: Fix pointer dereferenced before checking

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Message-ID: <68443e94-32fc-a35e-3383-0dcd8ca967c0@quicinc.com>
Date:   Mon, 30 May 2022 17:36:51 -0700
From:   Abhinav Kumar <quic_abhinavk@...cinc.com>
To:     Haowen Bai <baihaowen@...zu.com>, Rob Clark <robdclark@...il.com>,
        "Dmitry Baryshkov" <dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>, "David Airlie" <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
CC:     <linux-arm-msm@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <freedreno@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/msm/dpu: Fix pointer dereferenced before checking



On 5/30/2022 12:33 AM, Haowen Bai wrote:
> The ctx->hw is dereferencing before null checking, so move
> it after checking.
> 
> Signed-off-by: Haowen Bai <baihaowen@...zu.com>

Agree with Dmitry's comment. Adjust the patch subject to a different one 
otherwise PW thinks they are same patches.

Reviewed-by: Abhinav Kumar <quic_abhinavk@...cinc.com>

> ---
>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_wb.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_wb.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_wb.c
> index bcccce292937..e59680cdd0ce 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_wb.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_wb.c
> @@ -155,11 +155,13 @@ static void dpu_hw_wb_roi(struct dpu_hw_wb *ctx, struct dpu_hw_wb_cfg *wb)
>   static void dpu_hw_wb_setup_qos_lut(struct dpu_hw_wb *ctx,
>   		struct dpu_hw_wb_qos_cfg *cfg)
>   {
> -	struct dpu_hw_blk_reg_map *c = &ctx->hw;
> +	struct dpu_hw_blk_reg_map *c;
>   	u32 qos_ctrl = 0;
>   
>   	if (!ctx || !cfg)
>   		return;
> +	
> +	c = &ctx->hw;
>   
>   	DPU_REG_WRITE(c, WB_DANGER_LUT, cfg->danger_lut);
>   	DPU_REG_WRITE(c, WB_SAFE_LUT, cfg->safe_lut);