linux-kernel - Re: [PATCH] Bluetooth: Silence static checker warning.

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Message-ID: <1330537602.3392.101.camel@aeonflux>
Date:	Wed, 29 Feb 2012 09:46:42 -0800
From:	Marcel Holtmann <marcel@...tmann.org>
To:	santosh nayak <santoshprasadnayak@...il.com>
Cc:	padovan@...fusion.mobi, davem@...emloft.net,
	linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] Bluetooth: Silence static checker warning.

Hi Santosh,

> > Silencing Static checker warning.
> > 1. Endian warning
> > 2. variable dereferenced before check 'sk' .
> > 
> > Signed-off-by: Santosh Nayak <santoshprasadnayak@...il.com>
> > ---
> >  net/bluetooth/l2cap_sock.c |    9 ++++++---
> >  1 files changed, 6 insertions(+), 3 deletions(-)
> > 
> > diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
> > index 401d942..d206321 100644
> > --- a/net/bluetooth/l2cap_sock.c
> > +++ b/net/bluetooth/l2cap_sock.c
> > @@ -82,7 +82,7 @@ static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
> >  	}
> >  
> >  	if (la.l2_cid)
> > -		err = l2cap_add_scid(chan, la.l2_cid);
> > +		err = l2cap_add_scid(chan, __le16_to_cpu(la.l2_cid));
> >  	else
> >  		err = l2cap_add_psm(chan, &la.l2_bdaddr, la.l2_psm);
> >  
> > @@ -123,7 +123,8 @@ static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int al
> >  	if (la.l2_cid && la.l2_psm)
> >  		return -EINVAL;
> >  
> > -	err = l2cap_chan_connect(chan, la.l2_psm, la.l2_cid, &la.l2_bdaddr);
> > +	err = l2cap_chan_connect(chan, la.l2_psm, __le16_to_cpu(la.l2_cid),
> > +				&la.l2_bdaddr);
> >  	if (err)
> >  		goto done;
> 
> I am not sure about this one. Need to go back and read through the
> source code. The value provided from userspace is already in the right
> host endian. Could be that we mess up our internal classification. And
> instead of adding __le16_to_cpu we should fix its classification.

I confused myself here, so the provided PSM and CID values coming from
userspace are little endian. Patch is correct.

Acked-by: Marcel Holtmann <marcel@...tmann.org>

Regards

Marcel


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