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To:     kernel test robot <lkp@intel.com>,
        Oliver Hartkopp <socketcan@hartkopp.net>
Cc:     kbuild-all@lists.01.org, linux-kernel@vger.kernel.org,
        Yoshinori Sato <ysato@users.sourceforge.jp>,
        Rich Felker <dalias@libc.org>,
        Linux-sh list <linux-sh@vger.kernel.org>
References: <202012270307.H8cY6ALL-lkp@intel.com>
From:   Marc Kleine-Budde <mkl@pengutronix.de>
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Subject: Re: net/can/isotp.c:1240:13: sparse: sparse: incorrect type in
 initializer (different address spaces)
Message-ID: <3aee710f-b092-82e3-1a0d-1af3f153c00b@pengutronix.de>
Date:   Mon, 4 Jan 2021 10:11:52 +0100
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In-Reply-To: <202012270307.H8cY6ALL-lkp@intel.com>
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From: Marc Kleine-Budde <mkl@pengutronix.de>
To: kernel test robot <lkp@intel.com>,
 Oliver Hartkopp <socketcan@hartkopp.net>
Cc: kbuild-all@lists.01.org, linux-kernel@vger.kernel.org,
 Yoshinori Sato <ysato@users.sourceforge.jp>, Rich Felker <dalias@libc.org>,
 Linux-sh list <linux-sh@vger.kernel.org>
Message-ID: <3aee710f-b092-82e3-1a0d-1af3f153c00b@pengutronix.de>
Subject: Re: net/can/isotp.c:1240:13: sparse: sparse: incorrect type in
 initializer (different address spaces)
References: <202012270307.H8cY6ALL-lkp@intel.com>
In-Reply-To: <202012270307.H8cY6ALL-lkp@intel.com>

--ovQUPl2P4NScgDuIg8M3npzcV00a4R4DK
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On 12/26/20 8:29 PM, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.=
git master
> head:   f838f8d2b694cf9d524dc4423e9dd2db13892f3f
> commit: e057dd3fc20ffb3d7f150af46542a51b59b90127 can: add ISO 15765-2:2=
016 transport protocol
> date:   3 months ago
> config: sh-randconfig-s032-20201225 (attached as .config)
> compiler: sh4-linux-gcc (GCC) 9.3.0
> reproduce:
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/s=
bin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # apt-get install sparse
>         # sparse version: v0.6.3-184-g1b896707-dirty
>         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linu=
x.git/commit/?id=3De057dd3fc20ffb3d7f150af46542a51b59b90127
>         git remote add linus https://git.kernel.org/pub/scm/linux/kerne=
l/git/torvalds/linux.git
>         git fetch --no-tags linus master
>         git checkout e057dd3fc20ffb3d7f150af46542a51b59b90127
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=3D$HOME/0day COMPILER=3Dgcc-9.3.0 make.cr=
oss C=3D1 CF=3D'-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=3Dsh=20
>=20
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@intel.com>
>=20
>=20
> "sparse warnings: (new ones prefixed by >>)"
>>> net/can/isotp.c:1240:13: sparse: sparse: incorrect type in initialize=
r (different address spaces) @@     expected int const *__gu_addr @@     =
got int [noderef] __user *optlen @@
>    net/can/isotp.c:1240:13: sparse:     expected int const *__gu_addr
>    net/can/isotp.c:1240:13: sparse:     got int [noderef] __user *optle=
n
>>> net/can/isotp.c:1240:13: sparse: sparse: incorrect type in argument 1=
 (different address spaces) @@     expected void const volatile [noderef]=
 __user *ptr @@     got int const *__gu_addr @@
>    net/can/isotp.c:1240:13: sparse:     expected void const volatile [n=
oderef] __user *ptr
>    net/can/isotp.c:1240:13: sparse:     got int const *__gu_addr

=46rom my point of view, it looks like the get_user() on the sh platform =
is
somehow different to the other platform, which all accept a __user pointe=
r. IMHO
this should be fixed in sh.

> vim +1240 net/can/isotp.c
>=20
>   1229=09
>   1230	static int isotp_getsockopt(struct socket *sock, int level, int =
optname,
>   1231				    char __user *optval, int __user *optlen)
>   1232	{
>   1233		struct sock *sk =3D sock->sk;
>   1234		struct isotp_sock *so =3D isotp_sk(sk);
>   1235		int len;
>   1236		void *val;
>   1237=09
>   1238		if (level !=3D SOL_CAN_ISOTP)
>   1239			return -EINVAL;
>> 1240		if (get_user(len, optlen))

regards,
Marc

--=20
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |


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