linux-kernel - Re: [PATCH 24/54] md/raid1: Improve another size determination in setup

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Message-ID: <20161012074307.GB5687@mwanda>
Date:   Wed, 12 Oct 2016 11:28:39 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Jes Sorensen <Jes.Sorensen@...hat.com>
Cc:     Richard Weinberger <richard.weinberger@...il.com>,
        SF Markus Elfring <elfring@...rs.sourceforge.net>,
        "linux-raid@...r.kernel.org" <linux-raid@...r.kernel.org>,
        Christoph Hellwig <hch@....de>,
        Guoqing Jiang <gqjiang@...e.com>, Jens Axboe <axboe@...com>,
        Mike Christie <mchristi@...hat.com>,
        Neil Brown <neilb@...e.com>, Shaohua Li <shli@...nel.org>,
        Tomasz Majchrzak <tomasz.majchrzak@...el.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH 24/54] md/raid1: Improve another size determination in
 setup_conf()

Compare:

	foo = kmalloc(sizeof(*foo), GFP_KERNEL);

This says you are allocating enough space for foo.  It can be reviewed
by looking at one line.  If you change the type of foo it will still
work.

	foo = kmalloc(sizeof(struct whatever), GFP_KERNEL);

There isn't enough information to say if this is correct.  If you change
the type of foo then you have to update the allocation as well.

It's not a super common type of bug, but I see it occasionally.

regards,
dan carpenter