Author: delphij
Date: Mon Nov 13 07:47:43 2017
New Revision: 325755
URL: https://svnweb.freebsd.org/changeset/base/325755
Log:
Be more careful when doing calculation with request from userland.
MFC after: 2 weeks
Modified:
head/sys/kern/kern_proc.c
Modified: head/sys/kern/kern_proc.c
==============================================================================
--- head/sys/kern/kern_proc.c Mon Nov 13 03:41:50 2017 (r325754)
+++ head/sys/kern/kern_proc.c Mon Nov 13 07:47:43 2017 (r325755)
@@ -1956,7 +1956,7 @@ 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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