[kbuild] Re: [PATCH] net: Allow any address multicast join for IP sockets

[Dan Carpenter]

Hi Callum,

url:    https://github.com/0day-ci/linux/commits/Callum-Sinclair/net-Allow-any-address-multicast-join-for-IP-sockets/20210706-091734 
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git  79160a603bdb51916226caf4a6616cc4e1c58a58
compiler: m68k-linux-gcc (GCC) 9.3.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

cppcheck possible warnings: (new ones prefixed by >>, may not real problems)

>> net/ipv4/igmp.c:1432:9: warning: Uninitialized variable: im [uninitvar]
    return im;
           ^

vim +1432 net/ipv4/igmp.c

b05967ad8bde7d Callum Sinclair 2021-07-06  1416  static struct ip_mc_list *ip_mc_hash_lookup(struct ip_mc_list __rcu **mc_hash,
b05967ad8bde7d Callum Sinclair 2021-07-06  1417  					    __be32 mc_addr)
b05967ad8bde7d Callum Sinclair 2021-07-06  1418  {
b05967ad8bde7d Callum Sinclair 2021-07-06  1419  	struct ip_mc_list *im;
b05967ad8bde7d Callum Sinclair 2021-07-06  1420  	u32 hash;
b05967ad8bde7d Callum Sinclair 2021-07-06  1421  
b05967ad8bde7d Callum Sinclair 2021-07-06  1422  	if (mc_hash) {
b05967ad8bde7d Callum Sinclair 2021-07-06  1423  		hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
b05967ad8bde7d Callum Sinclair 2021-07-06  1424  		for (im = rcu_dereference(mc_hash[hash]);
b05967ad8bde7d Callum Sinclair 2021-07-06  1425  		     im != NULL;
b05967ad8bde7d Callum Sinclair 2021-07-06  1426  		     im = rcu_dereference(im->next_hash)) {
b05967ad8bde7d Callum Sinclair 2021-07-06  1427  			if (im->multiaddr == mc_addr)
b05967ad8bde7d Callum Sinclair 2021-07-06  1428  				break;
b05967ad8bde7d Callum Sinclair 2021-07-06  1429  			}
b05967ad8bde7d Callum Sinclair 2021-07-06  1430  	}

"im" not intialized on else path.

b05967ad8bde7d Callum Sinclair 2021-07-06  1431  
b05967ad8bde7d Callum Sinclair 2021-07-06 @1432  	return im;
b05967ad8bde7d Callum Sinclair 2021-07-06  1433  }

---
0-DAY CI Kernel Test Service, Intel Corporation
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