Commit 0d9cac0c authored by Dan Carpenter's avatar Dan Carpenter Committed by Thomas Hellstrom

drm/vmwgfx: Potential off by one in vmw_view_add()

The vmw_view_cmd_to_type() function returns vmw_view_max (3) on error.
It's one element beyond the end of the vmw_view_cotables[] table.

My read on this is that it's possible to hit this failure.  header->id
comes from vmw_cmd_check() and it's a user controlled number between
1040 and 1225 so we can hit that error.  But I don't have the hardware
to test this code.

Fixes: d80efd5c ("drm/vmwgfx: Initial DX support")
Signed-off-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: default avatarThomas Hellstrom <thellstrom@vmware.com>
Cc: <stable@vger.kernel.org>
parent 98648ae6
......@@ -2731,6 +2731,8 @@ static int vmw_cmd_dx_view_define(struct vmw_private *dev_priv,
}
view_type = vmw_view_cmd_to_type(header->id);
if (view_type == vmw_view_max)
return -EINVAL;
cmd = container_of(header, typeof(*cmd), header);
ret = vmw_cmd_res_check(dev_priv, sw_context, vmw_res_surface,
user_surface_converter,
......
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