linux-kernel - [PATCH 5.1 096/115] drm/vmwgfx: NULL pointer dereference from vmw_cmd_dx_view

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Date:   Mon, 17 Jun 2019 23:09:56 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Murray McAllister <murray.mcallister@...il.com>,
        Thomas Hellstrom <thellstrom@...are.com>
Subject: [PATCH 5.1 096/115] drm/vmwgfx: NULL pointer dereference from vmw_cmd_dx_view_define()

From: Murray McAllister <murray.mcallister@...il.com>

commit bcd6aa7b6cbfd6f985f606c6f76046d782905820 upstream.

If SVGA_3D_CMD_DX_DEFINE_RENDERTARGET_VIEW is called with a surface
ID of SVGA3D_INVALID_ID, the srf struct will remain NULL after
vmw_cmd_res_check(), leading to a null pointer dereference in
vmw_view_add().

Cc: <stable@...r.kernel.org>
Fixes: d80efd5cb3de ("drm/vmwgfx: Initial DX support")
Signed-off-by: Murray McAllister <murray.mcallister@...il.com>
Reviewed-by: Thomas Hellstrom <thellstrom@...are.com>
Signed-off-by: Thomas Hellstrom <thellstrom@...are.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>


---
 drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
@@ -2588,6 +2588,10 @@ static int vmw_cmd_dx_view_define(struct
 	if (view_type == vmw_view_max)
 		return -EINVAL;
 	cmd = container_of(header, typeof(*cmd), header);
+	if (unlikely(cmd->sid == SVGA3D_INVALID_ID)) {
+		DRM_ERROR("Invalid surface id.\n");
+		return -EINVAL;
+	}
 	ret = vmw_cmd_res_check(dev_priv, sw_context, vmw_res_surface,
 				user_surface_converter,
 				&cmd->sid, &srf);