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Be more careful when doing calculation with request from userland.

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MFC after:	2 weeks
This commit is contained in:
delphij 2017-11-13 07:47:43 +00:00
parent 60dfbe416a
commit 62fdd4ef88
1 changed files with 1 additions and 1 deletions
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2
sys/kern/kern_proc.c
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@ -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);