netdev - Re: [PATCH] socket: fix struct ifreq size in compat ioctl

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Date:   Fri, 14 Sep 2018 06:48:57 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Johannes Berg <johannes@...solutions.net>
Cc:     kbuild-all@...org, netdev@...r.kernel.org,
        Robert O'Callahan <robert@...llahan.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Johannes Berg <johannes.berg@...el.com>
Subject: Re: [PATCH] socket: fix struct ifreq size in compat ioctl

Hi Johannes,

I love your patch! Yet something to improve:

[auto build test ERROR on net/master]
[also build test ERROR on v4.19-rc3 next-20180913]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Johannes-Berg/socket-fix-struct-ifreq-size-in-compat-ioctl/20180914-061826
config: x86_64-randconfig-x013-201836 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   net/socket.c: In function 'sock_do_ioctl':
>> net/socket.c:972:24: error: invalid application of 'sizeof' to incomplete type 'struct compat_ifreq'
           compat ? sizeof(struct compat_ifreq) :
                           ^~~~~~
   net/socket.c:978:23: error: invalid application of 'sizeof' to incomplete type 'struct compat_ifreq'
          compat ? sizeof(struct compat_ifreq) :
                          ^~~~~~

vim +972 net/socket.c

   942	
   943	static long sock_do_ioctl(struct net *net, struct socket *sock,
   944				  unsigned int cmd, unsigned long arg,
   945				  bool compat)
   946	{
   947		int err;
   948		void __user *argp = (void __user *)arg;
   949	
   950		err = sock->ops->ioctl(sock, cmd, arg);
   951	
   952		/*
   953		 * If this ioctl is unknown try to hand it down
   954		 * to the NIC driver.
   955		 */
   956		if (err != -ENOIOCTLCMD)
   957			return err;
   958	
   959		if (cmd == SIOCGIFCONF) {
   960			struct ifconf ifc;
   961			if (copy_from_user(&ifc, argp, sizeof(struct ifconf)))
   962				return -EFAULT;
   963			rtnl_lock();
   964			err = dev_ifconf(net, &ifc, sizeof(struct ifreq));
   965			rtnl_unlock();
   966			if (!err && copy_to_user(argp, &ifc, sizeof(struct ifconf)))
   967				err = -EFAULT;
   968		} else {
   969			struct ifreq ifr;
   970			bool need_copyout;
   971			if (copy_from_user(&ifr, argp,
 > 972					   compat ? sizeof(struct compat_ifreq) :
   973						    sizeof(struct ifreq)))
   974				return -EFAULT;
   975			err = dev_ioctl(net, cmd, &ifr, &need_copyout);
   976			if (!err && need_copyout)
   977				if (copy_to_user(argp, &ifr,
   978						 compat ? sizeof(struct compat_ifreq) :
   979							  sizeof(struct ifreq)))
   980					return -EFAULT;
   981		}
   982		return err;
   983	}
   984	

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0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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