[Bug 264649] drm: fix signed integer overflow

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 13 Jun 2022 02:26:58 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264649

            Bug ID: 264649
           Summary: drm: fix signed integer overflow
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: xiaohuizhang@ruc.edu.cn

Created attachment 234655
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=234655&action=edit
a possible patch

Use 1UL for unsigned long, or we'll meet a overflow issue with UBSAN.

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