linux-kernel - Re: [PATCH v2 RESEND] drm/msm/dpu: reorder pointer operations after sanity checks to avoid NULL deref

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Message-ID: <181a3138-fce2-47cb-8258-ff08a00c2b3a@quicinc.com>
Date: Tue, 8 Apr 2025 11:21:31 -0700
From: Abhinav Kumar <quic_abhinavk@...cinc.com>
To: Qasim Ijaz <qasdev00@...il.com>, <robdclark@...il.com>, <lumag@...nel.org>,
        <sean@...rly.run>, <marijn.suijten@...ainline.org>,
        <airlied@...il.com>, <simona@...ll.ch>, <quic_jesszhan@...cinc.com>
CC: <linux-arm-msm@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <freedreno@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        "Dmitry
 Baryshkov" <dmitry.baryshkov@...aro.org>
Subject: Re: [PATCH v2 RESEND] drm/msm/dpu: reorder pointer operations after
 sanity checks to avoid NULL deref



On 4/8/2025 10:22 AM, Qasim Ijaz wrote:
> _dpu_encoder_trigger_start dereferences "struct dpu_encoder_phys *phys"
> before the sanity checks which can lead to a NULL pointer dereference if
> phys is NULL.
>   
> Fix this by reordering the dereference after the sanity checks.
>   
> Fixes: 8144d17a81d9 ("drm/msm/dpu: Skip trigger flush and start for CWB")
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> Signed-off-by: Qasim Ijaz <qasdev00@...il.com>
> ---
> v2:
> - Moved Signed-off tag below Fixes tag
> - Moved dpu_enc declaration to the top and initialisation below sanity checks
> 
>   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
> 

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