netdev - Re: [PATCH 10/11] net: ipv4: hlen could be set as size

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Date:	Fri, 23 Oct 2015 20:43:41 +0800
From:	kbuild test robot <lkp@...el.com>
To:	LABBE Corentin <clabbe.montjoie@...il.com>
Cc:	kbuild-all@...org, davem@...emloft.net, jmorris@...ei.org,
	kaber@...sh.net, kuznet@....inr.ac.ru, yoshfuji@...ux-ipv6.org,
	LABBE Corentin <clabbe.montjoie@...il.com>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 10/11] net: ipv4: hlen could be set as size_t

Hi LABBE,

[auto build test WARNING on net/master -- if it's inappropriate base, please suggest rules for selecting the more suitable base]

url:    https://github.com/0day-ci/linux/commits/LABBE-Corentin/net-change-len-parameter-type-for-memcpy_-to-from-_msg/20151023-201642
config: xtensa-allyesconfig (attached as .config)
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=xtensa 

All warnings (new ones prefixed by >>):

   In file included from include/asm-generic/bug.h:13:0,
                    from arch/xtensa/include/generated/asm/bug.h:1,
                    from include/linux/bug.h:4,
                    from include/linux/thread_info.h:11,
                    from arch/xtensa/include/asm/current.h:16,
                    from net/ipv4/raw.c:43:
   net/ipv4/raw.c: In function 'raw_getfrag':
   include/linux/kernel.h:722:17: warning: comparison of distinct pointer types lacks a cast
     (void) (&_min1 == &_min2);  \
                    ^
>> net/ipv4/raw.c:458:14: note: in expansion of macro 'min'
      int copy = min(rfv->hlen - offset, len);
                 ^

vim +/min +458 net/ipv4/raw.c

b61e9dcc5 Al Viro        2014-11-24  442  	err = memcpy_from_msg(rfv->hdr.c, rfv->msg, rfv->hlen);
32b5913a9 Herbert Xu     2014-11-07  443  	if (err)
32b5913a9 Herbert Xu     2014-11-07  444  		return err;
^1da177e4 Linus Torvalds 2005-04-16  445  
c008ba5bd Herbert Xu     2014-11-07  446  	fl4->fl4_icmp_type = rfv->hdr.icmph.type;
c008ba5bd Herbert Xu     2014-11-07  447  	fl4->fl4_icmp_code = rfv->hdr.icmph.code;
^1da177e4 Linus Torvalds 2005-04-16  448  
a27b58fed Heiko Carstens 2006-10-30  449  	return 0;
^1da177e4 Linus Torvalds 2005-04-16  450  }
^1da177e4 Linus Torvalds 2005-04-16  451  
c008ba5bd Herbert Xu     2014-11-07  452  static int raw_getfrag(void *from, char *to, int offset, int len, int odd,
c008ba5bd Herbert Xu     2014-11-07  453  		       struct sk_buff *skb)
c008ba5bd Herbert Xu     2014-11-07  454  {
c008ba5bd Herbert Xu     2014-11-07  455  	struct raw_frag_vec *rfv = from;
c008ba5bd Herbert Xu     2014-11-07  456  
c008ba5bd Herbert Xu     2014-11-07  457  	if (offset < rfv->hlen) {
c008ba5bd Herbert Xu     2014-11-07 @458  		int copy = min(rfv->hlen - offset, len);
c008ba5bd Herbert Xu     2014-11-07  459  
c008ba5bd Herbert Xu     2014-11-07  460  		if (skb->ip_summed == CHECKSUM_PARTIAL)
c008ba5bd Herbert Xu     2014-11-07  461  			memcpy(to, rfv->hdr.c + offset, copy);
c008ba5bd Herbert Xu     2014-11-07  462  		else
c008ba5bd Herbert Xu     2014-11-07  463  			skb->csum = csum_block_add(
c008ba5bd Herbert Xu     2014-11-07  464  				skb->csum,
c008ba5bd Herbert Xu     2014-11-07  465  				csum_partial_copy_nocheck(rfv->hdr.c + offset,
c008ba5bd Herbert Xu     2014-11-07  466  							  to, copy, 0),

:::::: The code at line 458 was first introduced by commit
:::::: c008ba5bdc9fa830e1a349b20b0be5a137bdef7a ipv4: Avoid reading user iov twice after raw_probe_proto_opt

:::::: TO: Herbert Xu <herbert@...dor.apana.org.au>
:::::: CC: David S. Miller <davem@...emloft.net>

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