linux-kernel - Re: [patch -next] FMC: NULL dereference on allocation failure

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Message-ID: <20130619175758.GA23533@mail.gnudd.com>
Date:	Wed, 19 Jun 2013 19:57:58 +0200
From:	Alessandro Rubini <rubini@...dd.com>
To:	joe@...ches.com
Cc:	dan.carpenter@...cle.com, gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [patch -next] FMC: NULL dereference on allocation failure

>> +	arr->record = kzalloc(sizeof(arr->record[0]) * n, GFP_KERNEL);
>> +	arr->subtree = kzalloc(sizeof(arr->subtree[0]) * n, GFP_KERNEL);

> n comes from the hardware no?

Yes. Length of hardware description array.

> Maybe make these kcalloc too.

I'm not a fan of kcalloc. I think it removes readability. I remeber
kernel patches to swap the arguments, because people get them wrong.
Even Kernighan said it was a design error (in "the practice of
programming").  That said, I'm not the leader here.

thanks
/alessandro
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