netdev - [syzbot] KMSAN: uninit-value in nf_nat_setup

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Message-ID: <0000000000003118ba05d500cce1@google.com>
Date:   Fri, 07 Jan 2022 08:51:26 -0800
From:   syzbot <syzbot+cbcd154fce7c6d953d1c@...kaller.appspotmail.com>
To:     coreteam@...filter.org, davem@...emloft.net, fw@...len.de,
        glider@...gle.com, kadlec@...filter.org, kuba@...nel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        netfilter-devel@...r.kernel.org, pablo@...filter.org,
        syzkaller-bugs@...glegroups.com
Subject: [syzbot] KMSAN: uninit-value in nf_nat_setup_info (2)

Hello,

syzbot found the following issue on:

HEAD commit:    81c325bbf94e kmsan: hooks: do not check memory in kmsan_in..
git tree:       https://github.com/google/kmsan.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=125922b3b00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=46a956fc7a887c60
dashboard link: https://syzkaller.appspot.com/bug?extid=cbcd154fce7c6d953d1c
compiler:       clang version 14.0.0 (/usr/local/google/src/llvm-git-monorepo 2b554920f11c8b763cd9ed9003f4e19b919b8e1f), GNU ld (GNU Binutils for Debian) 2.35.2
userspace arch: i386

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

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+cbcd154fce7c6d953d1c@...kaller.appspotmail.com

=====================================================
BUG: KMSAN: uninit-value in __nf_ct_tuple_src_equal include/net/netfilter/nf_conntrack_tuple.h:128 [inline]
BUG: KMSAN: uninit-value in nf_ct_tuple_equal include/net/netfilter/nf_conntrack_tuple.h:143 [inline]
BUG: KMSAN: uninit-value in nf_nat_setup_info+0x3adb/0x4750 net/netfilter/nf_nat_core.c:607
 __nf_ct_tuple_src_equal include/net/netfilter/nf_conntrack_tuple.h:128 [inline]
 nf_ct_tuple_equal include/net/netfilter/nf_conntrack_tuple.h:143 [inline]
 nf_nat_setup_info+0x3adb/0x4750 net/netfilter/nf_nat_core.c:607
 __nf_nat_alloc_null_binding net/netfilter/nf_nat_core.c:664 [inline]
 nf_nat_alloc_null_binding net/netfilter/nf_nat_core.c:670 [inline]
 nf_nat_inet_fn+0x12bc/0x1720 net/netfilter/nf_nat_core.c:759
 nf_nat_ipv6_fn+0x4dd/0x580 net/netfilter/nf_nat_proto.c:937
 nf_nat_ipv6_local_fn+0xa7/0x830 net/netfilter/nf_nat_proto.c:1001
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow+0x184/0x480 net/netfilter/core.c:619
 nf_hook include/linux/netfilter.h:262 [inline]
 NF_HOOK include/linux/netfilter.h:305 [inline]
 ip6_xmit+0x27b6/0x2880 net/ipv6/ip6_output.c:324
 sctp_v6_xmit+0xd84/0x19b0 net/sctp/ipv6.c:250
 sctp_packet_transmit+0x438f/0x45a0 net/sctp/output.c:652
 sctp_packet_singleton+0x3d8/0x580 net/sctp/outqueue.c:777
 sctp_outq_flush_ctrl net/sctp/outqueue.c:908 [inline]
 sctp_outq_flush+0x667/0x5eb0 net/sctp/outqueue.c:1202
 sctp_outq_uncork+0x105/0x120 net/sctp/outqueue.c:758
 sctp_side_effects net/sctp/sm_sideeffect.c:1195 [inline]
 sctp_do_sm+0x946f/0x9b50 net/sctp/sm_sideeffect.c:1166
 sctp_primitive_ASSOCIATE+0x172/0x1a0 net/sctp/primitive.c:73
 sctp_sendmsg_to_asoc+0x143f/0x1f90 net/sctp/socket.c:1837
 sctp_sendmsg+0x3eaa/0x5460 net/sctp/socket.c:2027
 inet_sendmsg+0x15b/0x1d0 net/ipv4/af_inet.c:819
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg net/socket.c:724 [inline]
 ____sys_sendmsg+0xe11/0x12c0 net/socket.c:2409
 ___sys_sendmsg net/socket.c:2463 [inline]
 __sys_sendmsg+0x704/0x840 net/socket.c:2492
 __compat_sys_sendmsg net/compat.c:347 [inline]
 __do_compat_sys_sendmsg net/compat.c:354 [inline]
 __se_compat_sys_sendmsg net/compat.c:351 [inline]
 __ia32_compat_sys_sendmsg+0xed/0x130 net/compat.c:351
 do_syscall_32_irqs_on arch/x86/entry/common.c:114 [inline]
 __do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:180
 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:205
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:248
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c

Uninit was stored to memory at:
 nf_ct_invert_tuple+0x5e8/0x620 net/netfilter/nf_conntrack_core.c:464
 nf_nat_setup_info+0x30d/0x4750 net/netfilter/nf_nat_core.c:602
 __nf_nat_alloc_null_binding net/netfilter/nf_nat_core.c:664 [inline]
 nf_nat_alloc_null_binding net/netfilter/nf_nat_core.c:670 [inline]
 nf_nat_inet_fn+0x12bc/0x1720 net/netfilter/nf_nat_core.c:759
 nf_nat_ipv6_fn+0x4dd/0x580 net/netfilter/nf_nat_proto.c:937
 nf_nat_ipv6_local_fn+0xa7/0x830 net/netfilter/nf_nat_proto.c:1001
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow+0x184/0x480 net/netfilter/core.c:619
 nf_hook include/linux/netfilter.h:262 [inline]
 NF_HOOK include/linux/netfilter.h:305 [inline]
 ip6_xmit+0x27b6/0x2880 net/ipv6/ip6_output.c:324
 sctp_v6_xmit+0xd84/0x19b0 net/sctp/ipv6.c:250
 sctp_packet_transmit+0x438f/0x45a0 net/sctp/output.c:652
 sctp_packet_singleton+0x3d8/0x580 net/sctp/outqueue.c:777
 sctp_outq_flush_ctrl net/sctp/outqueue.c:908 [inline]
 sctp_outq_flush+0x667/0x5eb0 net/sctp/outqueue.c:1202
 sctp_outq_uncork+0x105/0x120 net/sctp/outqueue.c:758
 sctp_side_effects net/sctp/sm_sideeffect.c:1195 [inline]
 sctp_do_sm+0x946f/0x9b50 net/sctp/sm_sideeffect.c:1166
 sctp_primitive_ASSOCIATE+0x172/0x1a0 net/sctp/primitive.c:73
 sctp_sendmsg_to_asoc+0x143f/0x1f90 net/sctp/socket.c:1837
 sctp_sendmsg+0x3eaa/0x5460 net/sctp/socket.c:2027
 inet_sendmsg+0x15b/0x1d0 net/ipv4/af_inet.c:819
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg net/socket.c:724 [inline]
 ____sys_sendmsg+0xe11/0x12c0 net/socket.c:2409
 ___sys_sendmsg net/socket.c:2463 [inline]
 __sys_sendmsg+0x704/0x840 net/socket.c:2492
 __compat_sys_sendmsg net/compat.c:347 [inline]
 __do_compat_sys_sendmsg net/compat.c:354 [inline]
 __se_compat_sys_sendmsg net/compat.c:351 [inline]
 __ia32_compat_sys_sendmsg+0xed/0x130 net/compat.c:351
 do_syscall_32_irqs_on arch/x86/entry/common.c:114 [inline]
 __do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:180
 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:205
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:248
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c

Uninit was stored to memory at:
 __nf_conntrack_alloc+0x2de/0x7f0 net/netfilter/nf_conntrack_core.c:1559
 init_conntrack+0x29b/0x2530 net/netfilter/nf_conntrack_core.c:1635
 resolve_normal_ct net/netfilter/nf_conntrack_core.c:1746 [inline]
 nf_conntrack_in+0x1b4b/0x2fe0 net/netfilter/nf_conntrack_core.c:1901
 ipv6_conntrack_local+0x68/0x80 net/netfilter/nf_conntrack_proto.c:414
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow+0x184/0x480 net/netfilter/core.c:619
 nf_hook include/linux/netfilter.h:262 [inline]
 NF_HOOK include/linux/netfilter.h:305 [inline]
 ip6_xmit+0x27b6/0x2880 net/ipv6/ip6_output.c:324
 sctp_v6_xmit+0xd84/0x19b0 net/sctp/ipv6.c:250
 sctp_packet_transmit+0x438f/0x45a0 net/sctp/output.c:652
 sctp_packet_singleton+0x3d8/0x580 net/sctp/outqueue.c:777
 sctp_outq_flush_ctrl net/sctp/outqueue.c:908 [inline]
 sctp_outq_flush+0x667/0x5eb0 net/sctp/outqueue.c:1202
 sctp_outq_uncork+0x105/0x120 net/sctp/outqueue.c:758
 sctp_side_effects net/sctp/sm_sideeffect.c:1195 [inline]
 sctp_do_sm+0x946f/0x9b50 net/sctp/sm_sideeffect.c:1166
 sctp_primitive_ASSOCIATE+0x172/0x1a0 net/sctp/primitive.c:73
 sctp_sendmsg_to_asoc+0x143f/0x1f90 net/sctp/socket.c:1837
 sctp_sendmsg+0x3eaa/0x5460 net/sctp/socket.c:2027
 inet_sendmsg+0x15b/0x1d0 net/ipv4/af_inet.c:819
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg net/socket.c:724 [inline]
 ____sys_sendmsg+0xe11/0x12c0 net/socket.c:2409
 ___sys_sendmsg net/socket.c:2463 [inline]
 __sys_sendmsg+0x704/0x840 net/socket.c:2492
 __compat_sys_sendmsg net/compat.c:347 [inline]
 __do_compat_sys_sendmsg net/compat.c:354 [inline]
 __se_compat_sys_sendmsg net/compat.c:351 [inline]
 __ia32_compat_sys_sendmsg+0xed/0x130 net/compat.c:351
 do_syscall_32_irqs_on arch/x86/entry/common.c:114 [inline]
 __do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:180
 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:205
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:248
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c

Uninit was stored to memory at:
 nf_ct_invert_tuple+0x614/0x620 net/netfilter/nf_conntrack_core.c:465
 init_conntrack+0x11f/0x2530 net/netfilter/nf_conntrack_core.c:1629
 resolve_normal_ct net/netfilter/nf_conntrack_core.c:1746 [inline]
 nf_conntrack_in+0x1b4b/0x2fe0 net/netfilter/nf_conntrack_core.c:1901
 ipv6_conntrack_local+0x68/0x80 net/netfilter/nf_conntrack_proto.c:414
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow+0x184/0x480 net/netfilter/core.c:619
 nf_hook include/linux/netfilter.h:262 [inline]
 NF_HOOK include/linux/netfilter.h:305 [inline]
 ip6_xmit+0x27b6/0x2880 net/ipv6/ip6_output.c:324
 sctp_v6_xmit+0xd84/0x19b0 net/sctp/ipv6.c:250
 sctp_packet_transmit+0x438f/0x45a0 net/sctp/output.c:652
 sctp_packet_singleton+0x3d8/0x580 net/sctp/outqueue.c:777
 sctp_outq_flush_ctrl net/sctp/outqueue.c:908 [inline]
 sctp_outq_flush+0x667/0x5eb0 net/sctp/outqueue.c:1202
 sctp_outq_uncork+0x105/0x120 net/sctp/outqueue.c:758
 sctp_side_effects net/sctp/sm_sideeffect.c:1195 [inline]
 sctp_do_sm+0x946f/0x9b50 net/sctp/sm_sideeffect.c:1166
 sctp_primitive_ASSOCIATE+0x172/0x1a0 net/sctp/primitive.c:73
 sctp_sendmsg_to_asoc+0x143f/0x1f90 net/sctp/socket.c:1837
 sctp_sendmsg+0x3eaa/0x5460 net/sctp/socket.c:2027
 inet_sendmsg+0x15b/0x1d0 net/ipv4/af_inet.c:819
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg net/socket.c:724 [inline]
 ____sys_sendmsg+0xe11/0x12c0 net/socket.c:2409
 ___sys_sendmsg net/socket.c:2463 [inline]
 __sys_sendmsg+0x704/0x840 net/socket.c:2492
 __compat_sys_sendmsg net/compat.c:347 [inline]
 __do_compat_sys_sendmsg net/compat.c:354 [inline]
 __se_compat_sys_sendmsg net/compat.c:351 [inline]
 __ia32_compat_sys_sendmsg+0xed/0x130 net/compat.c:351
 do_syscall_32_irqs_on arch/x86/entry/common.c:114 [inline]
 __do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:180
 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:205
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:248
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c

Uninit was stored to memory at:
 nf_ct_get_tuple_ports net/netfilter/nf_conntrack_core.c:255 [inline]
 nf_ct_get_tuple+0x1500/0x1730 net/netfilter/nf_conntrack_core.c:327
 resolve_normal_ct net/netfilter/nf_conntrack_core.c:1722 [inline]
 nf_conntrack_in+0x74d/0x2fe0 net/netfilter/nf_conntrack_core.c:1901
 ipv6_conntrack_local+0x68/0x80 net/netfilter/nf_conntrack_proto.c:414
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow+0x184/0x480 net/netfilter/core.c:619
 nf_hook include/linux/netfilter.h:262 [inline]
 NF_HOOK include/linux/netfilter.h:305 [inline]
 ip6_xmit+0x27b6/0x2880 net/ipv6/ip6_output.c:324
 sctp_v6_xmit+0xd84/0x19b0 net/sctp/ipv6.c:250
 sctp_packet_transmit+0x438f/0x45a0 net/sctp/output.c:652
 sctp_packet_singleton+0x3d8/0x580 net/sctp/outqueue.c:777
 sctp_outq_flush_ctrl net/sctp/outqueue.c:908 [inline]
 sctp_outq_flush+0x667/0x5eb0 net/sctp/outqueue.c:1202
 sctp_outq_uncork+0x105/0x120 net/sctp/outqueue.c:758
 sctp_side_effects net/sctp/sm_sideeffect.c:1195 [inline]
 sctp_do_sm+0x946f/0x9b50 net/sctp/sm_sideeffect.c:1166
 sctp_primitive_ASSOCIATE+0x172/0x1a0 net/sctp/primitive.c:73
 sctp_sendmsg_to_asoc+0x143f/0x1f90 net/sctp/socket.c:1837
 sctp_sendmsg+0x3eaa/0x5460 net/sctp/socket.c:2027
 inet_sendmsg+0x15b/0x1d0 net/ipv4/af_inet.c:819
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg net/socket.c:724 [inline]
 ____sys_sendmsg+0xe11/0x12c0 net/socket.c:2409
 ___sys_sendmsg net/socket.c:2463 [inline]
 __sys_sendmsg+0x704/0x840 net/socket.c:2492
 __compat_sys_sendmsg net/compat.c:347 [inline]
 __do_compat_sys_sendmsg net/compat.c:354 [inline]
 __se_compat_sys_sendmsg net/compat.c:351 [inline]
 __ia32_compat_sys_sendmsg+0xed/0x130 net/compat.c:351
 do_syscall_32_irqs_on arch/x86/entry/common.c:114 [inline]
 __do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:180
 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:205
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:248
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c

Uninit was stored to memory at:
 pskb_expand_head+0x3c9/0x1ca0 net/core/skbuff.c:1710
 skb_expand_head+0x561/0x970 net/core/skbuff.c:1828
 ip6_xmit+0xb97/0x2880 net/ipv6/ip6_output.c:266
 sctp_v6_xmit+0xd84/0x19b0 net/sctp/ipv6.c:250
 sctp_packet_transmit+0x438f/0x45a0 net/sctp/output.c:652
 sctp_packet_singleton+0x3d8/0x580 net/sctp/outqueue.c:777
 sctp_outq_flush_ctrl net/sctp/outqueue.c:908 [inline]
 sctp_outq_flush+0x667/0x5eb0 net/sctp/outqueue.c:1202
 sctp_outq_uncork+0x105/0x120 net/sctp/outqueue.c:758
 sctp_side_effects net/sctp/sm_sideeffect.c:1195 [inline]
 sctp_do_sm+0x946f/0x9b50 net/sctp/sm_sideeffect.c:1166
 sctp_primitive_ASSOCIATE+0x172/0x1a0 net/sctp/primitive.c:73
 sctp_sendmsg_to_asoc+0x143f/0x1f90 net/sctp/socket.c:1837
 sctp_sendmsg+0x3eaa/0x5460 net/sctp/socket.c:2027
 inet_sendmsg+0x15b/0x1d0 net/ipv4/af_inet.c:819
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg net/socket.c:724 [inline]
 ____sys_sendmsg+0xe11/0x12c0 net/socket.c:2409
 ___sys_sendmsg net/socket.c:2463 [inline]
 __sys_sendmsg+0x704/0x840 net/socket.c:2492
 __compat_sys_sendmsg net/compat.c:347 [inline]
 __do_compat_sys_sendmsg net/compat.c:354 [inline]
 __se_compat_sys_sendmsg net/compat.c:351 [inline]
 __ia32_compat_sys_sendmsg+0xed/0x130 net/compat.c:351
 do_syscall_32_irqs_on arch/x86/entry/common.c:114 [inline]
 __do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:180
 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:205
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:248
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c

Uninit was created at:
 slab_post_alloc_hook mm/slab.h:524 [inline]
 slab_alloc_node mm/slub.c:3251 [inline]
 __kmalloc_node_track_caller+0xe0c/0x1510 mm/slub.c:4974
 kmalloc_reserve net/core/skbuff.c:354 [inline]
 __alloc_skb+0x545/0xf90 net/core/skbuff.c:426
 alloc_skb include/linux/skbuff.h:1126 [inline]
 sctp_packet_transmit+0x528/0x45a0 net/sctp/output.c:597
 sctp_packet_singleton+0x3d8/0x580 net/sctp/outqueue.c:777
 sctp_outq_flush_ctrl net/sctp/outqueue.c:908 [inline]
 sctp_outq_flush+0x667/0x5eb0 net/sctp/outqueue.c:1202
 sctp_outq_uncork+0x105/0x120 net/sctp/outqueue.c:758
 sctp_side_effects net/sctp/sm_sideeffect.c:1195 [inline]
 sctp_do_sm+0x946f/0x9b50 net/sctp/sm_sideeffect.c:1166
 sctp_primitive_ASSOCIATE+0x172/0x1a0 net/sctp/primitive.c:73
 sctp_sendmsg_to_asoc+0x143f/0x1f90 net/sctp/socket.c:1837
 sctp_sendmsg+0x3eaa/0x5460 net/sctp/socket.c:2027
 inet_sendmsg+0x15b/0x1d0 net/ipv4/af_inet.c:819
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg net/socket.c:724 [inline]
 ____sys_sendmsg+0xe11/0x12c0 net/socket.c:2409
 ___sys_sendmsg net/socket.c:2463 [inline]
 __sys_sendmsg+0x704/0x840 net/socket.c:2492
 __compat_sys_sendmsg net/compat.c:347 [inline]
 __do_compat_sys_sendmsg net/compat.c:354 [inline]
 __se_compat_sys_sendmsg net/compat.c:351 [inline]
 __ia32_compat_sys_sendmsg+0xed/0x130 net/compat.c:351
 do_syscall_32_irqs_on arch/x86/entry/common.c:114 [inline]
 __do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:180
 do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:205
 do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:248
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c

CPU: 0 PID: 21099 Comm: syz-executor.2 Not tainted 5.16.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
=====================================================


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