linux-kernel - Re: Hopefully, kmalloc() will always succeed, but if it doesn't then....

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Message-ID: <20061023040018.28823.qmail@web55602.mail.re4.yahoo.com>
Date:	Sun, 22 Oct 2006 21:00:17 -0700 (PDT)
From:	Amit Choudhary <amit2030@...oo.com>
To:	Roland Dreier <rdreier@...co.com>
Cc:	Jan Engelhardt <jengelh@...ux01.gwdg.de>,
	Pekka Enberg <penberg@...helsinki.fi>,
	linux-kernel@...r.kernel.org
Subject: Re: Hopefully, kmalloc() will always succeed, but if it doesn't then....



--- Roland Dreier <rdreier@...co.com> wrote:

>  >         struct mixart_enum_connector_resp *connector;
>  >         struct mixart_audio_info_req  *audio_info_req;
>  >         struct mixart_audio_info_resp *audio_info;
>  > 
>  >         connector = kmalloc(sizeof(*connector), GFP_KERNEL);
>  >         audio_info_req = kmalloc(sizeof(*audio_info_req), GFP_KERNEL);
>  >         audio_info = kmalloc(sizeof(*audio_info), GFP_KERNEL);
>  >         if (! connector || ! audio_info_req || ! audio_info) {
>  >                 err = -ENOMEM;
>  >                 goto __error;
>  >         }
> 
> This is not a bug.  All of the pointers are initialized, and if

Yes, this is not a bug. Although the case for arrays go unnoticed by gcc. Something like this:

        char *abcd[20];
        int i;

        for (i = 0; i < 20; i++) {
                abcd[i] = kmalloc(10, GFP_KERNEL);
                if (!abcd[i])
                        goto error;
        }
 error:
        for (i = 0; i < 20; i++)
                kfree(abcd[i]);

-Amit

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