linux-kernel - Re: net/can/isotp.c:1240:13: sparse: sparse: incorrect type in initializer (different address spaces)

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Date:   Fri, 30 Oct 2020 20:14:45 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Oliver Hartkopp <socketcan@...tkopp.net>,
        kernel test robot <lkp@...el.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Rich Felker <dalias@...c.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        linux-can <linux-can@...r.kernel.org>
Subject: Re: net/can/isotp.c:1240:13: sparse: sparse: incorrect type in
 initializer (different address spaces)

On 10/30/20 7:55 PM, Oliver Hartkopp wrote:
>>>    1229	
>>>    1230	static int isotp_getsockopt(struct socket *sock, int level, int optname,
>>>    1231				    char __user *optval, int __user *optlen)
>>>    1232	{
>>>    1233		struct sock *sk = sock->sk;
>>>    1234		struct isotp_sock *so = isotp_sk(sk);
>>>    1235		int len;
>>>    1236		void *val;
>>>    1237	
>>>    1238		if (level != SOL_CAN_ISOTP)
>>>    1239			return -EINVAL;
>>>> 1240		if (get_user(len, optlen))
>>>    1241			return -EFAULT;
>>>    1242		if (len < 0)
>>>    1243			return -EINVAL;
>>>    1244	
> 
> Sorry but there are tons of identical items in the networking subsystem 
> in getsockopt functions.
> 
> And I don't get the sparse warning with make C=1 for none of the 
> occurrences of

Due to ARCH=sh

looks like sh is missing the some __user annotations so that sparse spwes these
warnings.

Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
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