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Date:   Mon, 19 Sep 2022 15:41:12 +0200
From:   Alexander Potapenko <glider@...gle.com>
To:     joannelkoong@...il.com, Jakub Kicinski <kuba@...nel.org>
Cc:     Networking <netdev@...r.kernel.org>
Subject: Use of uninit value in inet_bind2_bucket_find

Hi Joanne, Jakub et al.,

When building next-20220919 with KMSAN I am seeing the following error
at boot time:

=====================================================
BUG: KMSAN: uninit-value in inet_bind2_bucket_find+0x71f/0x790
net/ipv4/inet_hashtables.c:827
 inet_bind2_bucket_find+0x71f/0x790 net/ipv4/inet_hashtables.c:827
 inet_csk_get_port+0x2415/0x32e0 net/ipv4/inet_connection_sock.c:529
 __inet6_bind+0x1474/0x1a20 net/ipv6/af_inet6.c:406
 inet6_bind+0x176/0x360 net/ipv6/af_inet6.c:465
 __sys_bind+0x5b3/0x750 net/socket.c:1776
 __do_sys_bind net/socket.c:1787
 __se_sys_bind net/socket.c:1785
 __x64_sys_bind+0x8d/0xe0 net/socket.c:1785
 do_syscall_x64 arch/x86/entry/common.c:50
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd ??:?

Uninit was created at:
 slab_post_alloc_hook+0x156/0xb40 mm/slab.h:759
 slab_alloc_node mm/slub.c:3331
 slab_alloc mm/slub.c:3339
 __kmem_cache_alloc_lru mm/slub.c:3346
 kmem_cache_alloc+0x47e/0x9f0 mm/slub.c:3355
 inet_bind2_bucket_create+0x4b/0x3b0 net/ipv4/inet_hashtables.c:128
 inet_csk_get_port+0x2513/0x32e0 net/ipv4/inet_connection_sock.c:533
 __inet_bind+0xbd2/0x1040 net/ipv4/af_inet.c:525
 inet_bind+0x184/0x360 net/ipv4/af_inet.c:456
 __sys_bind+0x5b3/0x750 net/socket.c:1776
 __do_sys_bind net/socket.c:1787
 __se_sys_bind net/socket.c:1785
 __x64_sys_bind+0x8d/0xe0 net/socket.c:1785
 do_syscall_x64 arch/x86/entry/common.c:50
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd ??:?

CPU: 3 PID: 5983 Comm: sshd Not tainted 6.0.0-rc6-next-20220919 #211
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.16.0-debian-1.16.0-4 04/01/2014
=====================================================

I think this is related to "net: Add a bhash2 table hashed by port and
address", could you please take a look?
This error is not reported on v6.0-rc5 (note that KMSAN only exists in
-next and as a v6.0-rc5 fork at https://github.com/google/kmsan).

Alex

-- 
Alexander Potapenko
Software Engineer

Google Germany GmbH
Erika-Mann-Straße, 33
80636 München

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