Patch "drm/amdgpu/vkms: fix a possible null pointer dereference" has been added to the 6.5-stable tree

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This is a note to let you know that I've just added the patch titled

    drm/amdgpu/vkms: fix a possible null pointer dereference

to the 6.5-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-amdgpu-vkms-fix-a-possible-null-pointer-derefere.patch
and it can be found in the queue-6.5 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit ee9a4ffd70e43cfa2d7dcba3362a65b9da078784
Author: Ma Ke <make_ruc2021@xxxxxxx>
Date:   Fri Oct 13 09:53:43 2023 +0800

    drm/amdgpu/vkms: fix a possible null pointer dereference
    
    [ Upstream commit cd90511557fdfb394bb4ac4c3b539b007383914c ]
    
    In amdgpu_vkms_conn_get_modes(), the return value of drm_cvt_mode()
    is assigned to mode, which will lead to a NULL pointer dereference
    on failure of drm_cvt_mode(). Add a check to avoid null pointer
    dereference.
    
    Signed-off-by: Ma Ke <make_ruc2021@xxxxxxx>
    Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c
index d0748bcfad16b..75d25fba80821 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vkms.c
@@ -239,6 +239,8 @@ static int amdgpu_vkms_conn_get_modes(struct drm_connector *connector)
 
 	for (i = 0; i < ARRAY_SIZE(common_modes); i++) {
 		mode = drm_cvt_mode(dev, common_modes[i].w, common_modes[i].h, 60, false, false, false);
+		if (!mode)
+			continue;
 		drm_mode_probed_add(connector, mode);
 	}
 



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