linux-kernel - Re: [PATCH net-next 07/14] ipvlan: Support IPv6 for learnable l2-bridge

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Message-ID: <202511110823.oBrdGTfa-lkp@intel.com>
Date: Tue, 11 Nov 2025 08:33:07 +0800
From: kernel test robot <lkp@...el.com>
To: Dmitry Skorodumov <skorodumov.dmitry@...wei.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: oe-kbuild-all@...ts.linux.dev, andrey.bokhanko@...wei.com,
	Dmitry Skorodumov <skorodumov.dmitry@...wei.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH net-next 07/14] ipvlan: Support IPv6 for learnable
 l2-bridge

Hi Dmitry,

kernel test robot noticed the following build warnings:

[auto build test WARNING on net-next/main]

url:    https://github.com/intel-lab-lkp/linux/commits/Dmitry-Skorodumov/ipvlan-Preparation-to-support-mac-nat/20251106-004449
base:   net-next/main
patch link:    https://lore.kernel.org/r/20251105161450.1730216-8-skorodumov.dmitry%40huawei.com
patch subject: [PATCH net-next 07/14] ipvlan: Support IPv6 for learnable l2-bridge
config: um-randconfig-r123-20251110 (https://download.01.org/0day-ci/archive/20251111/202511110823.oBrdGTfa-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 93d445cba39f4dd3dcda4fa1433eca825cf8fc09)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251111/202511110823.oBrdGTfa-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202511110823.oBrdGTfa-lkp@intel.com/

sparse warnings: (new ones prefixed by >>)
   drivers/net/ipvlan/ipvlan_core.c:56:36: sparse: sparse: incorrect type in argument 1 (different base types) @@     expected unsigned int [usertype] a @@     got restricted __be32 const [usertype] s_addr @@
   drivers/net/ipvlan/ipvlan_core.c:56:36: sparse:     expected unsigned int [usertype] a
   drivers/net/ipvlan/ipvlan_core.c:56:36: sparse:     got restricted __be32 const [usertype] s_addr
>> drivers/net/ipvlan/ipvlan_core.c:794:23: sparse: sparse: incorrect type in argument 1 (different base types) @@     expected unsigned short [usertype] val @@     got restricted __be16 [usertype] payload_len @@
   drivers/net/ipvlan/ipvlan_core.c:794:23: sparse:     expected unsigned short [usertype] val
   drivers/net/ipvlan/ipvlan_core.c:794:23: sparse:     got restricted __be16 [usertype] payload_len
   drivers/net/ipvlan/ipvlan_core.c:794:23: sparse: sparse: cast from restricted __be16
   drivers/net/ipvlan/ipvlan_core.c:794:23: sparse: sparse: cast from restricted __be16
   drivers/net/ipvlan/ipvlan_core.c:794:19: sparse: sparse: cast from restricted __be16
   drivers/net/ipvlan/ipvlan_core.c:854:23: sparse: sparse: incorrect type in argument 1 (different base types) @@     expected unsigned short [usertype] val @@     got restricted __be16 [usertype] payload_len @@
   drivers/net/ipvlan/ipvlan_core.c:854:23: sparse:     expected unsigned short [usertype] val
   drivers/net/ipvlan/ipvlan_core.c:854:23: sparse:     got restricted __be16 [usertype] payload_len
   drivers/net/ipvlan/ipvlan_core.c:854:23: sparse: sparse: cast from restricted __be16
   drivers/net/ipvlan/ipvlan_core.c:854:23: sparse: sparse: cast from restricted __be16
   drivers/net/ipvlan/ipvlan_core.c:854:19: sparse: sparse: cast from restricted __be16

vim +794 drivers/net/ipvlan/ipvlan_core.c

   785	
   786	static u8 *ipvlan_search_icmp6_ll_addr(struct sk_buff *skb, u8 icmp_option)
   787	{
   788		/* skb is ensured to pullable for all ipv6 payload_len by caller */
   789		struct ipv6hdr *ip6h = ipv6_hdr(skb);
   790		struct icmp6hdr *icmph;
   791		int ndsize, curr_off;
   792	
   793		icmph = (struct icmp6hdr *)(ip6h + 1);
 > 794		ndsize = (int)htons(ip6h->payload_len);
   795		curr_off = sizeof(*icmph);
   796	
   797		if (icmph->icmp6_type != NDISC_ROUTER_SOLICITATION)
   798			curr_off += sizeof(struct in6_addr);
   799	
   800		while ((curr_off + 2) < ndsize) {
   801			u8  *data = (u8 *)icmph + curr_off;
   802			u32 opt_len = data[1] << 3;
   803	
   804			if (unlikely(opt_len == 0))
   805				return NULL;
   806	
   807			if (data[0] != icmp_option) {
   808				curr_off += opt_len;
   809				continue;
   810			}
   811	
   812			if (unlikely(opt_len < ETH_ALEN + 2))
   813				return NULL;
   814	
   815			if (unlikely(curr_off + opt_len > ndsize))
   816				return NULL;
   817	
   818			return data + 2;
   819		}
   820	
   821		return NULL;
   822	}
   823	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki