From: Alexander Aring <alex.aring@gmail.com>
To: Anderson Lizardo <anderson.lizardo@openbossa.org>
Cc: linux-zigbee-devel@lists.sourceforge.net, werner@almesberger.net,
BlueZ development <linux-bluetooth@vger.kernel.org>
Subject: Re: [PATCH v2 bluetooth-next 1/7] 6lowpan: fix udp nullpointer dereferencing
Date: Tue, 17 Dec 2013 12:25:52 +0100 [thread overview]
Message-ID: <20131217112552.GB21663@omega> (raw)
In-Reply-To: <20131217110601.GA21663@omega>
On Tue, Dec 17, 2013 at 12:06:01PM +0100, Alexander Aring wrote:
> On Tue, Dec 17, 2013 at 06:58:12AM -0400, Anderson Lizardo wrote:
> > Hi Alexander,
> >
> > On Tue, Dec 17, 2013 at 6:32 AM, Alexander Aring <alex.aring@gmail.com> wrote:
> > > Sometimes a nullpointer dereferencing occurs because of using a wrong
> > > pointer arithmetic in udp_uncompression.
> > >
> > > This patch changes "**(hc06_ptr + 3)" to the right one "*(*hc06_ptr +
> > > 3)". Dereferencing like "**(hc06_ptr + 3)" works in a random case only.
> >
> > And why not use hc06_ptr[0][3] ? IMHO it is more readable and the
> > arithmetic is the same (as far as I know).
> >
>
> mhh maybe we change it to *hc06_ptr[3] ? Otherwise we have always
> something like [0][#] for access.
>
meant (*hc06_ptr)[3] here, but I have a better idea to add a function
wich sets some data and increment it automatically. Will send v3 with
that soon.
- Alex
next prev parent reply other threads:[~2013-12-17 11:25 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-17 10:32 [PATCH v2 bluetooth-next 0/7] 6lowpan: udp compression/uncompression fix Alexander Aring
2013-12-17 10:32 ` [PATCH v2 bluetooth-next 1/7] 6lowpan: fix udp nullpointer dereferencing Alexander Aring
2013-12-17 10:58 ` Anderson Lizardo
2013-12-17 11:06 ` Alexander Aring
2013-12-17 11:25 ` Alexander Aring [this message]
2013-12-17 10:32 ` [PATCH v2 bluetooth-next 2/7] 6lowpan: fix udp compress ordering Alexander Aring
2013-12-17 10:32 ` [PATCH v2 bluetooth-next 3/7] 6lowpan: fix udp byte ordering Alexander Aring
2013-12-17 10:32 ` [PATCH v2 bluetooth-next 4/7] 6lowpan: add udp warning for elided checksum Alexander Aring
2013-12-17 10:32 ` [PATCH v2 bluetooth-next 5/7] 6lowpan: udp use lowpan_fetch_skb function Alexander Aring
2013-12-17 10:32 ` [PATCH v2 bluetooth-next 6/7] 6lowpan: udp use subtraction on both conditions Alexander Aring
2013-12-17 10:32 ` [PATCH v2 bluetooth-next 7/7] 6lowpan: cleanup udp compress function Alexander Aring
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