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SubjectKMSAN: uninit-value in __dev_mc_add

syzbot found the following crash on:

HEAD commit: eb2e67596de2 kmsan: minor code cleanup
git tree:
console output:
kernel config:
dashboard link:
compiler: clang version 8.0.0 (trunk 339414)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:

BUG: KMSAN: uninit-value in memcmp+0x11d/0x180 lib/string.c:863
CPU: 0 PID: 14033 Comm: kworker/0:3 Not tainted 4.19.0-rc4+ #58
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: ipv6_addrconf addrconf_dad_work
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x2f6/0x430 lib/dump_stack.c:113
kmsan_report+0x183/0x2b0 mm/kmsan/kmsan.c:917
__msan_warning+0x70/0xc0 mm/kmsan/kmsan_instr.c:500
memcmp+0x11d/0x180 lib/string.c:863
__hw_addr_add_ex net/core/dev_addr_lists.c:61 [inline]
__dev_mc_add+0x215/0x8c0 net/core/dev_addr_lists.c:670
dev_mc_add+0x6d/0x80 net/core/dev_addr_lists.c:687
igmp6_group_added+0x2c8/0xaa0 net/ipv6/mcast.c:676
__ipv6_dev_mc_inc+0xf4b/0x1270 net/ipv6/mcast.c:934
ipv6_dev_mc_inc+0x70/0x80 net/ipv6/mcast.c:941
addrconf_join_solict net/ipv6/addrconf.c:2098 [inline]
addrconf_dad_begin net/ipv6/addrconf.c:3879 [inline]
addrconf_dad_work+0x437/0x29b0 net/ipv6/addrconf.c:4006
process_one_work+0x197f/0x2490 kernel/workqueue.c:2153
worker_thread+0x1f6a/0x2b00 kernel/workqueue.c:2296
kthread+0x59c/0x5d0 kernel/kthread.c:247
ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:416

Local variable description: ----buf@igmp6_group_added
Variable was created at:
igmp6_group_added+0x46/0xaa0 net/ipv6/mcast.c:664
__ipv6_dev_mc_inc+0xf4b/0x1270 net/ipv6/mcast.c:934

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