linux-kernel - Re: [PATCH] drm/msm/dpu: Fix error pointers in dpu_plane_virtual_atomic

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Message-ID: <5e64069f-d93e-404f-a4f1-99f2ef101f5f@quicinc.com>
Date: Tue, 8 Apr 2025 11:13:15 -0700
From: Abhinav Kumar <quic_abhinavk@...cinc.com>
To: Chenyuan Yang <chenyuan0y@...il.com>, <robdclark@...il.com>,
        <dmitry.baryshkov@...aro.org>, <sean@...rly.run>,
        <marijn.suijten@...ainline.org>, <airlied@...il.com>,
        <simona@...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 error pointers in
 dpu_plane_virtual_atomic_check



On 3/13/2025 6:10 PM, Chenyuan Yang wrote:
> The function dpu_plane_virtual_atomic_check was dereferencing pointers
> returned by drm_atomic_get_plane_state without checking for errors. This
> could lead to undefined behavior if the function returns an error pointer.
> 
> This commit adds checks using IS_ERR to ensure that plane_state is
> valid before dereferencing them.
> 
> Similar to commit da29abe71e16
> ("drm/amd/display: Fix error pointers in amdgpu_dm_crtc_mem_type_changed").
> 
> Fixes: 774bcfb73176 ("drm/msm/dpu: add support for virtual planes")
> Signed-off-by: Chenyuan Yang <chenyuan0y@...il.com>
> ---
>   drivers/gpu/drm/msm/disp/dpu1/dpu_plane.c | 3 +++
>   1 file changed, 3 insertions(+)
> 

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