From: Dan Carpenter <dan.carpenter@oracle.com>
To: Kalle Valo <kvalo@adurom.com>
Cc: Julian Calaby <julian.calaby@gmail.com>,
"John W. Linville" <linville@tuxdriver.com>,
linux-wireless@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: Re: [patch] wireless: at76c50x: allocating too much data
Date: Sat, 21 Apr 2012 12:45:23 +0000 [thread overview]
Message-ID: <20120421124523.GS6498@mwanda> (raw)
In-Reply-To: <87vcku9sob.fsf@purkki.adurom.net>
On Fri, Apr 20, 2012 at 09:14:44PM +0300, Kalle Valo wrote:
> Dan Carpenter <dan.carpenter@oracle.com> writes:
>
> > On Fri, Apr 20, 2012 at 06:57:00PM +1000, Julian Calaby wrote:
> >> > - struct mib_local *m = kmalloc(sizeof(struct mib_phy), GFP_KERNEL);
> >> > + struct mib_local *m = kmalloc(sizeof(struct mib_local), GFP_KERNEL);
> >>
> >> Would it be better practice to use sizeof(*m)?
> >>
> >
> > That was my temptation as well... But I decided to make it match
> > with the surrounding code. I'm happy to resend if people want.
>
> IMHO sizeof(*m) is better and I tend to use it.
>
> Related to this: I have a bad habit of sometimes dropping '*' from
> sizeof()? Is there a tool which could spot that?
>
That's what I was working on for Smatch when I sent this patch.
The odd thing is that I can't find any bugs like this in the kernel.
If sizeof(foo) is less than sizeof(*foo), which is probably the
normal case, then these get caught early on in testing.
Still I think people must have done manual audits as well... It
feels too clean to be natural.
regards,
dan carpenter
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WARNING: multiple messages have this Message-ID (diff)
From: Dan Carpenter <dan.carpenter@oracle.com>
To: Kalle Valo <kvalo@adurom.com>
Cc: Julian Calaby <julian.calaby@gmail.com>,
"John W. Linville" <linville@tuxdriver.com>,
linux-wireless@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: Re: [patch] wireless: at76c50x: allocating too much data
Date: Sat, 21 Apr 2012 15:45:23 +0300 [thread overview]
Message-ID: <20120421124523.GS6498@mwanda> (raw)
In-Reply-To: <87vcku9sob.fsf@purkki.adurom.net>
On Fri, Apr 20, 2012 at 09:14:44PM +0300, Kalle Valo wrote:
> Dan Carpenter <dan.carpenter@oracle.com> writes:
>
> > On Fri, Apr 20, 2012 at 06:57:00PM +1000, Julian Calaby wrote:
> >> > - struct mib_local *m = kmalloc(sizeof(struct mib_phy), GFP_KERNEL);
> >> > + struct mib_local *m = kmalloc(sizeof(struct mib_local), GFP_KERNEL);
> >>
> >> Would it be better practice to use sizeof(*m)?
> >>
> >
> > That was my temptation as well... But I decided to make it match
> > with the surrounding code. I'm happy to resend if people want.
>
> IMHO sizeof(*m) is better and I tend to use it.
>
> Related to this: I have a bad habit of sometimes dropping '*' from
> sizeof()? Is there a tool which could spot that?
>
That's what I was working on for Smatch when I sent this patch.
The odd thing is that I can't find any bugs like this in the kernel.
If sizeof(foo) is less than sizeof(*foo), which is probably the
normal case, then these get caught early on in testing.
Still I think people must have done manual audits as well... It
feels too clean to be natural.
regards,
dan carpenter
next prev parent reply other threads:[~2012-04-21 12:45 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-20 6:47 [patch] wireless: at76c50x: allocating too much data Dan Carpenter
2012-04-20 6:47 ` Dan Carpenter
2012-04-20 8:57 ` Julian Calaby
2012-04-20 8:57 ` Julian Calaby
2012-04-20 9:14 ` Dan Carpenter
2012-04-20 9:14 ` Dan Carpenter
2012-04-20 18:14 ` Kalle Valo
2012-04-20 18:14 ` Kalle Valo
2012-04-21 12:23 ` [patch v2] " Dan Carpenter
2012-04-21 12:23 ` Dan Carpenter
2012-04-21 12:45 ` Dan Carpenter [this message]
2012-04-21 12:45 ` [patch] " Dan Carpenter
2012-04-21 13:19 ` Julia Lawall
2012-04-21 13:19 ` Julia Lawall
2012-04-21 13:51 ` Julia Lawall
2012-04-21 13:51 ` Julia Lawall
2012-04-21 14:51 ` Dan Carpenter
2012-04-21 14:51 ` Dan Carpenter
2012-04-21 14:51 ` Julia Lawall
2012-04-21 14:51 ` Julia Lawall
2012-04-21 14:59 ` Dan Carpenter
2012-04-21 14:59 ` Dan Carpenter
2012-04-21 15:12 ` Dan Carpenter
2012-04-21 15:12 ` Dan Carpenter
2012-04-21 15:13 ` Julia Lawall
2012-04-21 15:13 ` Julia Lawall
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