linux-ext4 - Re: [patch] ext4 crypto: testing the wrong variable

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Date:	Wed, 08 Apr 2015 13:51:08 +0200
From:	walter harms <wharms@....de>
To:	Julia Lawall <julia.lawall@...6.fr>
CC:	Dan Carpenter <dan.carpenter@...cle.com>,
	Theodore Ts'o <tytso@....edu>,
	Michael Halcrow <mhalcrow@...gle.com>,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	linux-ext4@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [patch] ext4 crypto: testing the wrong variable



Am 08.04.2015 11:51, schrieb Julia Lawall:
>>  void ext4_fname_crypto_free_buffer(void **buf)
>>  {
>> -	if (*buf == NULL || IS_ERR(buf))
>> +	if (*buf == NULL || IS_ERR(*buf))
> 
> Why not use IS_ERR_OR_NULL?
> 
> julia


why test *buf == NULL ? xfree() can handle this.

the question is do programm depend on *buf=NULL.
In case of IS_ERR(*buf) *buf will be left unchanged
and later prgramms may things there is a buffer
available ?

> 
>>  		return;
>>  	kfree(*buf);
>>  	*buf = NULL;
>> --
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