netdev - Re: [PATCH] fix null-deref in ipv4_link

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Date: Fri, 8 Sep 2023 09:08:17 +0800
From: kernel test robot <lkp@...el.com>
To: Kyle Zeng <zengyhkyle@...il.com>, Paolo Abeni <pabeni@...hat.com>,
	dsahern@...nel.org
Cc: oe-kbuild-all@...ts.linux.dev, davem@...emloft.net,
	netdev@...r.kernel.org, ssuryaextr@...il.com
Subject: Re: [PATCH] fix null-deref in ipv4_link_failure

Hi Kyle,

kernel test robot noticed the following build warnings:

[auto build test WARNING on linus/master]
[also build test WARNING on v6.5 next-20230907]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Kyle-Zeng/fix-null-deref-in-ipv4_link_failure/20230908-065510
base:   linus/master
patch link:    https://lore.kernel.org/r/ZPpUfm%2FHhFet3ejH%40westworld
patch subject: [PATCH] fix null-deref in ipv4_link_failure
config: m68k-allyesconfig (https://download.01.org/0day-ci/archive/20230908/202309080837.urhzWjw6-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20230908/202309080837.urhzWjw6-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/202309080837.urhzWjw6-lkp@intel.com/

All warnings (new ones prefixed by >>):

   net/ipv4/route.c: In function 'ipv4_send_dest_unreach':
   net/ipv4/route.c:1235:52: error: 'net' undeclared (first use in this function)
    1235 |                 res = __ip_options_compile(dev_net(net), &opt, skb, NULL);
         |                                                    ^~~
   net/ipv4/route.c:1235:52: note: each undeclared identifier is reported only once for each function it appears in
>> net/ipv4/route.c:1218:28: warning: variable 'dev' set but not used [-Wunused-but-set-variable]
    1218 |         struct net_device *dev;
         |                            ^~~


vim +/dev +1218 net/ipv4/route.c

  1213	
  1214	static void ipv4_send_dest_unreach(struct sk_buff *skb)
  1215	{
  1216		struct ip_options opt;
  1217		int res;
> 1218		struct net_device *dev;
  1219	
  1220		/* Recompile ip options since IPCB may not be valid anymore.
  1221		 * Also check we have a reasonable ipv4 header.
  1222		 */
  1223		if (!pskb_network_may_pull(skb, sizeof(struct iphdr)) ||
  1224		    ip_hdr(skb)->version != 4 || ip_hdr(skb)->ihl < 5)
  1225			return;
  1226	
  1227		memset(&opt, 0, sizeof(opt));
  1228		if (ip_hdr(skb)->ihl > 5) {
  1229			if (!pskb_network_may_pull(skb, ip_hdr(skb)->ihl * 4))
  1230				return;
  1231			opt.optlen = ip_hdr(skb)->ihl * 4 - sizeof(struct iphdr);
  1232	
  1233			rcu_read_lock();
  1234			dev = skb->dev ? skb->dev : skb_rtable(skb)->dst.dev;
  1235			res = __ip_options_compile(dev_net(net), &opt, skb, NULL);
  1236			rcu_read_unlock();
  1237	
  1238			if (res)
  1239				return;
  1240		}
  1241		__icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0, &opt);
  1242	}
  1243	

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