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Message-ID: <68615698.a00a0220.274b5f.0013.GAE@google.com> Date: Sun, 29 Jun 2025 08:07:04 -0700 From: syzbot <syzbot+827ae2bfb3a3529333e9@...kaller.appspotmail.com> To: agordeev@...ux.ibm.com, alibuda@...ux.alibaba.com, contact@...aud-lcm.com, davem@...emloft.net, edumazet@...gle.com, guwen@...ux.alibaba.com, horms@...nel.org, jaka@...ux.ibm.com, kuba@...nel.org, linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org, linux-s390@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, syzkaller-bugs@...glegroups.com, tonylu@...ux.alibaba.com, wenjia@...ux.ibm.com Subject: Re: [syzbot] [smc?] KASAN: null-ptr-deref Read in smc_tcp_syn_recv_sock Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: WARNING in smc_tcp_syn_recv_sock ------------[ cut here ]------------ WARNING: CPU: 1 PID: 6792 at net/smc/af_smc.c:129 smc_tcp_syn_recv_sock+0x3f8/0x570 net/smc/af_smc.c:129 Modules linked in: CPU: 1 UID: 0 PID: 6792 Comm: syz.1.16 Not tainted 6.16.0-rc3-syzkaller-gdfba48a70cb6-dirty #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:smc_tcp_syn_recv_sock+0x3f8/0x570 net/smc/af_smc.c:129 Code: 48 8d bb f0 03 00 00 be 01 00 00 00 e8 21 c0 57 00 31 ff 89 c5 89 c6 e8 96 88 a2 f6 85 ed 0f 85 81 fc ff ff e8 49 8d a2 f6 90 <0f> 0b 90 e9 73 fc ff ff e8 3b 8d a2 f6 4c 89 fa 48 b8 00 00 00 00 RSP: 0018:ffffc90000a08780 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888034d95e80 RCX: ffffffff8b198ffa RDX: ffff88802825da00 RSI: ffffffff8b199007 RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: ffff8880352e89e0 R14: ffffc90000a08850 R15: ffff888034d95e80 FS: 00007fba98e0c6c0(0000) GS:ffff888124ab5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000040 CR3: 0000000032bf6000 CR4: 0000000000350ef0 Call Trace: <IRQ> tcp_check_req+0x69d/0x1f80 net/ipv4/tcp_minisocks.c:874 tcp_v4_rcv+0x19b0/0x4650 net/ipv4/tcp_ipv4.c:2283 ip_protocol_deliver_rcu+0xba/0x4c0 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x316/0x570 net/ipv4/ip_input.c:233 NF_HOOK include/linux/netfilter.h:317 [inline] NF_HOOK include/linux/netfilter.h:311 [inline] ip_local_deliver+0x18e/0x1f0 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:469 [inline] ip_rcv_finish net/ipv4/ip_input.c:447 [inline] NF_HOOK include/linux/netfilter.h:317 [inline] NF_HOOK include/linux/netfilter.h:311 [inline] ip_rcv+0x2c3/0x5d0 net/ipv4/ip_input.c:567 __netif_receive_skb_one_core+0x197/0x1e0 net/core/dev.c:5977 __netif_receive_skb+0x1d/0x160 net/core/dev.c:6090 process_backlog+0x442/0x15e0 net/core/dev.c:6442 __napi_poll.constprop.0+0xba/0x550 net/core/dev.c:7414 napi_poll net/core/dev.c:7478 [inline] net_rx_action+0xa9f/0xfe0 net/core/dev.c:7605 handle_softirqs+0x219/0x8e0 kernel/softirq.c:579 do_softirq kernel/softirq.c:480 [inline] do_softirq+0xb2/0xf0 kernel/softirq.c:467 </IRQ> <TASK> __local_bh_enable_ip+0x100/0x120 kernel/softirq.c:407 local_bh_enable include/linux/bottom_half.h:33 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:910 [inline] __dev_queue_xmit+0x8ab/0x43e0 net/core/dev.c:4740 dev_queue_xmit include/linux/netdevice.h:3355 [inline] neigh_hh_output include/net/neighbour.h:523 [inline] neigh_output include/net/neighbour.h:537 [inline] ip_finish_output2+0xc38/0x21a0 net/ipv4/ip_output.c:235 __ip_finish_output net/ipv4/ip_output.c:313 [inline] __ip_finish_output+0x49e/0x950 net/ipv4/ip_output.c:295 ip_finish_output+0x35/0x380 net/ipv4/ip_output.c:323 NF_HOOK_COND include/linux/netfilter.h:306 [inline] ip_output+0x13b/0x2a0 net/ipv4/ip_output.c:433 dst_output include/net/dst.h:459 [inline] ip_local_out net/ipv4/ip_output.c:129 [inline] __ip_queue_xmit+0x1d7d/0x26c0 net/ipv4/ip_output.c:527 __tcp_transmit_skb+0x2686/0x3e90 net/ipv4/tcp_output.c:1479 __tcp_send_ack.part.0+0x3de/0x700 net/ipv4/tcp_output.c:4279 __tcp_send_ack net/ipv4/tcp_output.c:4285 [inline] tcp_send_ack+0x84/0xa0 net/ipv4/tcp_output.c:4285 tcp_rcv_synsent_state_process net/ipv4/tcp_input.c:6632 [inline] tcp_rcv_state_process+0x4236/0x4ed0 net/ipv4/tcp_input.c:6826 tcp_v4_do_rcv+0x1ad/0xa90 net/ipv4/tcp_ipv4.c:1948 sk_backlog_rcv include/net/sock.h:1148 [inline] __release_sock+0x31b/0x400 net/core/sock.c:3213 release_sock+0x5a/0x220 net/core/sock.c:3767 mptcp_connect+0xccd/0xfe0 net/mptcp/protocol.c:3695 __inet_stream_connect+0x3c8/0x1020 net/ipv4/af_inet.c:677 inet_stream_connect+0x57/0xa0 net/ipv4/af_inet.c:748 __sys_connect_file+0x141/0x1a0 net/socket.c:2038 __sys_connect+0x13b/0x160 net/socket.c:2057 __do_sys_connect net/socket.c:2063 [inline] __se_sys_connect net/socket.c:2060 [inline] __x64_sys_connect+0x72/0xb0 net/socket.c:2060 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fba97f7e719 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fba98e0c038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00007fba98135f80 RCX: 00007fba97f7e719 RDX: 0000000000000010 RSI: 0000000020000000 RDI: 0000000000000004 RBP: 00007fba97ff132e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fba98135f80 R15: 00007ffdbf9fe0b8 </TASK> Tested on: commit: dfba48a7 Merge tag 'i2c-for-6.16-rc4' of git://git.ker.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1622a982580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d3e0d55231e0c89c dashboard link: https://syzkaller.appspot.com/bug?extid=827ae2bfb3a3529333e9 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=1097888c580000
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