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drm/vmwgfx: avoid null_ptr_deref in vmw_framebuffer_surface_create_handle

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The 'vmw_user_object_buffer' function may return NULL with incorrect
inputs. To avoid possible null pointer dereference, add a check whether
the 'bo' is NULL in the vmw_framebuffer_surface_create_handle.

Fixes: d6667f0ddf ("drm/vmwgfx: Fix handling of dumb buffers")
Signed-off-by: Chen Ridong <chenridong@huawei.com>
Signed-off-by: Zack Rusin <zack.rusin@broadcom.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241029083429.1185479-1-chenridong@huaweicloud.com
This commit is contained in:
Chen Ridong 2024-10-29 08:34:29 +00:00 committed by Zack Rusin
parent 9776c0a75a
commit 93d1f41a82
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
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@ -1265,6 +1265,8 @@ static int vmw_framebuffer_surface_create_handle(struct drm_framebuffer *fb,
struct vmw_framebuffer_surface *vfbs = vmw_framebuffer_to_vfbs(fb); struct vmw_framebuffer_surface *vfbs = vmw_framebuffer_to_vfbs(fb);
struct vmw_bo *bo = vmw_user_object_buffer(&vfbs->uo); struct vmw_bo *bo = vmw_user_object_buffer(&vfbs->uo);
if (WARN_ON(!bo))
return -EINVAL;
return drm_gem_handle_create(file_priv, &bo->tbo.base, handle); return drm_gem_handle_create(file_priv, &bo->tbo.base, handle);
} }