linux-kernel - Re: [PATCH 1/6] sysctl: faster reimplementation of sysctl_check

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Date:	Fri, 4 Feb 2011 23:34:14 +0200
From:	Lucian Adrian Grijincu <lucian.grijincu@...il.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Eric Dumazet <eric.dumazet@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Octavian Purdila <opurdila@...acom.com>
Subject: Re: [PATCH 1/6] sysctl: faster reimplementation of sysctl_check_table

On Fri, Feb 4, 2011 at 11:11 PM, Eric W. Biederman
<ebiederm@...ssion.com> wrote:
>> +static int __sysctl_check_table(struct nsproxy *namespaces,
>> +     struct ctl_table *table, struct ctl_table **parents, int depth)
>>  {
>> +     const char *fail = NULL;
>>       int error = 0;
>> +
>> +     if (depth >= CTL_MAXNAME) {
>
> This should be depth > CTL_MAXNAME.  Because there are only CTL_MAXNAME
> entries in the array.


A bit lower in the array we access 'parents[depth]'.
So the correct check should be (depth >= CTL_MAXNAME) => error.


>> -                     sysctl_check_leaf(namespaces, table, &fail);
>> +                     parents[depth] = table;
>> +                     sysctl_check_leaf(namespaces, table, &fail,
>> +                                       parents, depth);
>>               }

>> +             if (table->child) {
>> +                     parents[depth] = table;
>> +                     error |= __sysctl_check_table(namespaces, table->child,
>> +                                                   parents, depth + 1);
>> +             }



-- 
 .
..: Lucian