FAILED: patch "[PATCH] drm/vmwgfx: integer underflow in vmw_cmd_dx_set_shader()" failed to apply to 5.1-stable tree

The patch below does not apply to the 5.1-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 5ed7f4b5eca11c3c69e7c8b53e4321812bc1ee1e Mon Sep 17 00:00:00 2001
From: Murray McAllister <[email protected]>
Date: Mon, 20 May 2019 21:57:34 +1200
Subject: [PATCH] drm/vmwgfx: integer underflow in vmw_cmd_dx_set_shader()
leading to an invalid read

If SVGA_3D_CMD_DX_SET_SHADER is called with a shader ID
of SVGA3D_INVALID_ID, and a shader type of SVGA3D_SHADERTYPE_INVALID, the calculated binding.shader_slot will be 4294967295, leading to an out-of-bounds read in vmw_binding_loc() when the offset is calculated.

index b4c7553d2814..33533d126277 100644
@@ -2206,7 +2206,8 @@ static int vmw_cmd_dx_set_shader(struct vmw_private *dev_priv,
 
 	cmd = container_of(header, typeof(*cmd), header);
 
-	if (cmd->body.type >= SVGA3D_SHADERTYPE_DX10_MAX) {
+	if (cmd->body.type >= SVGA3D_SHADERTYPE_DX10_MAX ||
+	    cmd->body.type < SVGA3D_SHADERTYPE_MIN) {
 		VMW_DEBUG_USER("Illegal shader type %u.\n",
 			       (unsigned int) cmd->body.type);
 		return -EINVAL;