linux-kernel - Re: [PATCH] netlink: Fix kfree NULL pointer

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Message-ID: <AANLkTikfhz4AQntX2o5sSQy67TWb=rYqEjsoA2ju+Ycq@mail.gmail.com>
Date:	Wed, 8 Sep 2010 14:14:42 +0800
From:	jovi zhang <bookjovi@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Johannes Berg <johannes.berg@...el.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Alexey Dobriyan <adobriyan@...nvz.org>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] netlink: Fix kfree NULL pointer

On Wed, Sep 8, 2010 at 1:55 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> Le mercredi 08 septembre 2010 à 13:33 +0800, jovi zhang a écrit :
>
>> YES, maybe kfree(NULL) is legal, but I cannot see there have any need
>> to invoke kfree(NULL) in this function.
>>  Also I check kfree usage in other code, I havn't find any kfree(NULL) usage.
>
> We have hundred call sites doing kfree(NULL), if it makes code shorter.
>
> Its usually code path handling exceptions (errors if you prefer), and we
> prefer to use ugly gotos, and even kfree(NULL), to make it as short as
> possible.

OK, I understand.
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