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From:   Cong Wang <xiyou.wangcong@gmail.com>
Date:   Wed, 3 Apr 2019 15:51:18 -0700
Message-ID: <CAM_iQpWjwOwawBN3yiZ0F-B-HDSOW8KGfpLGhAsf5yE0A=wtDA@mail.gmail.com>
Subject: Re: [PATCH] Bluetooth: hci_event: potential out of bounds parsing ADV events
To:     Dan Carpenter <dan.carpenter@oracle.com>
Cc:     Tomas Bortoli <tomasbortoli@gmail.com>,
        Marcel Holtmann <marcel@holtmann.org>,
        Jaganath Kanakkassery <jaganath.k.os@gmail.com>,
        Johan Hedberg <johan.hedberg@gmail.com>,
        linux-bluetooth <linux-bluetooth@vger.kernel.org>,
        kernel-janitors@vger.kernel.org
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Sender: linux-bluetooth-owner@vger.kernel.org
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On Tue, Apr 2, 2019 at 1:15 PM Dan Carpenter <dan.carpenter@oracle.com> wrote:
>
> On Tue, Apr 02, 2019 at 10:42:38AM -0700, Cong Wang wrote:
> > > Btw, get rid of all the likely/unlikely() macros.  Then the other style
> > > comment would be don't move the "ev = (void *)skb->data;" assignments
> > > around.  It's ok to say:
> >
> >
> > Similarly, pskb_may_pull() may reallocate skb's, although very unlikely
> > for bluetooth case (skb's are linear). At least it doesn't harm anything
> > we move the skb->data dereference after pskb_may_pull().
> >
>
> It harms readability.

Why? I can't see how it harms readability if you have pskb_may_pull()
in mind that it potentially reallocates skb->data.