[Bug 213020] graphics/gd: Fix integer overflow in gdImageWebpCtx

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=213020

            Bug ID: 213020
           Summary: graphics/gd: Fix integer overflow in gdImageWebpCtx
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
               URL: https://github.com/libgd/libgd/issues/308
                OS: Any
            Status: New
          Keywords: patch, security
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: dinoex at FreeBSD.org
          Reporter: vlad-fbsd at acheronmedia.com
                CC: ale at FreeBSD.org, dinoex at FreeBSD.org,
                    ports-secteam at FreeBSD.org, tz at freebsd.org
 Attachment #175197 maintainer-approval?(dinoex at FreeBSD.org)
             Flags:
          Assignee: dinoex at FreeBSD.org
             Flags: maintainer-feedback?(dinoex at FreeBSD.org),
                    merge-quarterly?
                CC: dinoex at FreeBSD.org

Created attachment 175197
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=175197&action=edit
Fix integer overflow in gdImageWebpCtx

An integer overflow issue was found in function gdImageWebpCtx of file
gd_webp.c which could lead to heap buffer overflow.

* Upstream issue:
  https://github.com/libgd/libgd/issues/308

* Upstream commit:
 
https://github.com/libgd/libgd/commit/40bec0f38f50e8510f5bb71a82f516d46facde03

* CVE request:
  http://seclists.org/oss-sec/2016/q3/626

Patch attached. Passes Poudriere build with 11.0-RELEASE amd64. Running build
tests for 10.3 and 9.3.

VuXML entry coming up.

CC ports-secteam and maintainers of php70-gd and php56-gd.

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