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From: Xin LI <delphij@FreeBSD.org>
Date: Mon, 27 Nov 2017 03:47:12 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r326242 - stable/11/sys/kern
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Author: delphij
Date: Mon Nov 27 03:47:12 2017
New Revision: 326242
URL: https://svnweb.freebsd.org/changeset/base/326242

Log:
  MFC r325755: Be more careful when doing calculation with request from
  userland.

Modified:
  stable/11/sys/kern/kern_proc.c
Directory Properties:
  stable/11/   (props changed)

Modified: stable/11/sys/kern/kern_proc.c
==============================================================================
--- stable/11/sys/kern/kern_proc.c	Mon Nov 27 02:44:36 2017	(r326241)
+++ stable/11/sys/kern/kern_proc.c	Mon Nov 27 03:47:12 2017	(r326242)
@@ -1933,7 +1933,7 @@ sysctl_kern_proc_args(SYSCTL_HANDLER_ARGS)
 	if (error != 0 || req->newptr == NULL)
 		return (error);
 
-	if (req->newlen + sizeof(struct pargs) > ps_arg_cache_limit)
+	if (req->newlen > ps_arg_cache_limit - sizeof(struct pargs))
 		return (ENOMEM);
 	newpa = pargs_alloc(req->newlen);
 	error = SYSCTL_IN(req, newpa->ar_args, req->newlen);