netdev - [net-next:master 114/114] drivers/net/tun.c:2503:42: warning: Using plain integer as NULL pointer

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Date:   Sun, 18 Nov 2018 07:13:44 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Jason Wang <jasowang@...hat.com>
Cc:     kbuild-all@...org, netdev@...r.kernel.org
Subject: [net-next:master 114/114] drivers/net/tun.c:2503:42: warning: Using
 plain integer as NULL pointer

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git master
head:   f9e06c45cb28beb30a6a474952ead7da2b8940f3
commit: f9e06c45cb28beb30a6a474952ead7da2b8940f3 [114/114] tuntap: free XDP dropped packets in a batch
config: x86_64-allmodconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        git checkout f9e06c45cb28beb30a6a474952ead7da2b8940f3
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   include/linux/slab.h:332:43: warning: dubious: x & !y
   include/linux/slab.h:332:43: warning: dubious: x & !y
>> drivers/net/tun.c:2503:42: warning: Using plain integer as NULL pointer
   drivers/net/tun.c:2989:36: warning: incorrect type in argument 2 (different address spaces)
   drivers/net/tun.c:2989:36:    expected struct tun_prog [noderef] <asn:4>**prog_p
   drivers/net/tun.c:2989:36:    got struct tun_prog **prog_p
   drivers/net/tun.c:3281:42: warning: incorrect type in argument 2 (different address spaces)
   drivers/net/tun.c:3281:42:    expected struct tun_prog **prog_p
   drivers/net/tun.c:3281:42:    got struct tun_prog [noderef] <asn:4>**<noident>
   drivers/net/tun.c:3285:42: warning: incorrect type in argument 2 (different address spaces)
   drivers/net/tun.c:3285:42:    expected struct tun_prog **prog_p
   drivers/net/tun.c:3285:42:    got struct tun_prog [noderef] <asn:4>**<noident>
   drivers/net/tun.c:3378:9: error: incompatible types in comparison expression (different address spaces)
   include/linux/slab.h:332:43: warning: dubious: x & !y
   include/linux/slab.h:332:43: warning: dubious: x & !y

vim +2503 drivers/net/tun.c

  2490	
  2491	static int tun_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len)
  2492	{
  2493		int ret, i;
  2494		struct tun_file *tfile = container_of(sock, struct tun_file, socket);
  2495		struct tun_struct *tun = tun_get(tfile);
  2496		struct tun_msg_ctl *ctl = m->msg_control;
  2497		struct xdp_buff *xdp;
  2498	
  2499		if (!tun)
  2500			return -EBADFD;
  2501	
  2502		if (ctl && (ctl->type == TUN_MSG_PTR)) {
> 2503			struct tun_page tpage = {0};
  2504			int n = ctl->num;
  2505			int flush = 0;
  2506	
  2507			local_bh_disable();
  2508			rcu_read_lock();
  2509	
  2510			for (i = 0; i < n; i++) {
  2511				xdp = &((struct xdp_buff *)ctl->ptr)[i];
  2512				tun_xdp_one(tun, tfile, xdp, &flush, &tpage);
  2513			}
  2514	
  2515			if (flush)
  2516				xdp_do_flush_map();
  2517	
  2518			rcu_read_unlock();
  2519			local_bh_enable();
  2520	
  2521			tun_put_page(&tpage);
  2522	
  2523			ret = total_len;
  2524			goto out;
  2525		}
  2526	
  2527		ret = tun_get_user(tun, tfile, ctl ? ctl->ptr : NULL, &m->msg_iter,
  2528				   m->msg_flags & MSG_DONTWAIT,
  2529				   m->msg_flags & MSG_MORE);
  2530	out:
  2531		tun_put(tun);
  2532		return ret;
  2533	}
  2534	

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