Author: delphij
Date: Mon Nov 27 03:49:51 2017
New Revision: 326243
URL: https://svnweb.freebsd.org/changeset/base/326243
Log:
MFC r325755: Be more careful when doing calculation with request from
userland.
Modified:
stable/10/sys/kern/kern_proc.c
Directory Properties:
stable/10/ (props changed)
Modified: stable/10/sys/kern/kern_proc.c
==============================================================================
--- stable/10/sys/kern/kern_proc.c Mon Nov 27 03:47:12 2017
(r326242)
+++ stable/10/sys/kern/kern_proc.c Mon Nov 27 03:49:51 2017
(r326243)
@@ -1858,7 +1858,7 @@ 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);
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