From: David Miller <davem@davemloft.net>
To: amwang@redhat.com
Cc: eric.dumazet@gmail.com, netdev@vger.kernel.org
Subject: Re: [Patch net-next] ipv6: fix a potential NULL deref
Date: Mon, 29 Oct 2012 13:22:03 -0400 (EDT) [thread overview]
Message-ID: <20121029.132203.1458595923917658146.davem@davemloft.net> (raw)
In-Reply-To: <1351493366.8221.2.camel@cr0>
From: Cong Wang <amwang@redhat.com>
Date: Mon, 29 Oct 2012 14:49:26 +0800
> On Mon, 2012-10-29 at 07:10 +0100, Eric Dumazet wrote:
>> > - dst_release(&rt->dst);
>> > + if (rt)
>> > + dst_release(&rt->dst);
>> > }
>> >
>>
>> dst_release() is like kfree(), it accepts a NULL argument.
>>
>
> 'rt->dst' already dereferences 'rt', no matter dst_release() accepts
> NULL or not.
It's taking the address of a struct member, it's not a dereference.
You know what the difference is right?
next prev parent reply other threads:[~2012-10-29 17:22 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-29 3:50 [Patch net-next] ipv6: fix a potential NULL deref Cong Wang
2012-10-29 6:10 ` Eric Dumazet
2012-10-29 6:49 ` Cong Wang
2012-10-29 7:05 ` Eric Dumazet
2012-10-29 7:25 ` Cong Wang
2012-10-29 8:25 ` Eric Dumazet
2012-10-29 17:29 ` David Miller
2012-10-30 1:44 ` Cong Wang
2012-10-29 17:22 ` David Miller [this message]
2012-10-29 8:16 ` [Patch net-next] ipv6: remove another useless NULL check Cong Wang
2012-10-29 8:33 ` Eric Dumazet
2012-10-29 9:08 ` Cong Wang
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