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From: David Laight <David.Laight@ACULAB.COM>
To: 'Larry Finger' <Larry.Finger@lwfinger.net>,
	Aakash Hemadri <aakashhemadri123@gmail.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Phillip Potter <phil@philpotter.co.uk>
Cc: "linux-staging@lists.linux.dev" <linux-staging@lists.linux.dev>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH v2 2/5] staging: r8188eu: cast to restricted __be32
Date: Sun, 22 Aug 2021 21:30:45 +0000	[thread overview]
Message-ID: <05aafb94be1b4e609250313709cd668d@AcuMS.aculab.com> (raw)
In-Reply-To: <4be5c5fa-c3fd-8c86-e904-8e2e60173380@lwfinger.net>

From: Larry Finger
> Sent: 20 August 2021 22:45
> 
> On 8/19/21 3:17 AM, Aakash Hemadri wrote:
> > Fix sparse warning:
> >> rtw_br_ext.c:836:54: warning: cast to restricted __be32
> >
> > Unnecessary double cast, remove them.
> >
> > Signed-off-by: Aakash Hemadri <aakashhemadri123@gmail.com>
> > ---
> >   drivers/staging/r8188eu/core/rtw_br_ext.c | 2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/staging/r8188eu/core/rtw_br_ext.c b/drivers/staging/r8188eu/core/rtw_br_ext.c
> > index 404fa8904e47..6a0462ce6230 100644
> > --- a/drivers/staging/r8188eu/core/rtw_br_ext.c
> > +++ b/drivers/staging/r8188eu/core/rtw_br_ext.c
> > @@ -671,7 +671,7 @@ void dhcp_flag_bcast(struct adapter *priv, struct sk_buff *skb)
> >   				    (udph->dest == __constant_htons(SERVER_PORT))) { /*  DHCP request */
> >   					struct dhcpMessage *dhcph =
> >   						(struct dhcpMessage *)((size_t)udph + sizeof(struct udphdr));
> > -					u32 cookie = be32_to_cpu((__be32)dhcph->cookie);
> > +					u32 cookie = dhcph->cookie;
> >
> >   					if (cookie == DHCP_MAGIC) { /*  match magic word */
> >   						if (!(dhcph->flags & htons(BROADCAST_FLAG))) {
> >
> 
> This patch is wrong. All the documentation I could find tells me that the
> multi-byte entries in dhcph are big-endian, thus the new line should read:
> 
> 					u32 cookie = be32_to_cpu(dhcph->cookie);

Modulo anything that really means it should get_unaligned_be32().

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)

  parent reply	other threads:[~2021-08-22 21:30 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-19  8:17 [PATCH v2 0/5] staging: r8188eu: fix sparse warnings Aakash Hemadri
2021-08-19  8:17 ` [PATCH v2 1/5] staging: r8188eu: restricted __be16 degrades to int Aakash Hemadri
2021-08-19  8:17 ` [PATCH v2 2/5] staging: r8188eu: cast to restricted __be32 Aakash Hemadri
2021-08-19 12:58   ` Fabio M. De Francesco
2021-08-19 17:19   ` Greg Kroah-Hartman
2021-08-20 11:40     ` Aakash Hemadri
2021-08-20 21:44   ` Larry Finger
2021-08-21 14:21     ` Aakash Hemadri
2021-08-22 21:30     ` David Laight [this message]
2021-08-23  8:26       ` Aakash Hemadri
2021-08-23 14:19       ` Larry Finger
2021-08-19  8:17 ` [PATCH v2 3/5] staging: r8188eu: incorrect type in csum_ipv6_magic Aakash Hemadri
2021-08-20 21:38   ` Larry Finger
2021-08-21 14:19     ` Aakash Hemadri
2021-08-20 21:48   ` Larry Finger
2021-08-19  8:17 ` [PATCH v2 4/5] staging: r8188eu: restricted __be16 degrades to int Aakash Hemadri
2021-08-19 17:20   ` Greg Kroah-Hartman
2021-08-20 15:10     ` Fabio M. De Francesco
2021-08-21 14:18       ` Aakash Hemadri
2021-08-19  8:17 ` [PATCH v2 5/5] staging: r8188eu: incorrect type in assignment Aakash Hemadri

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