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Message-ID: <00000000000074ed27059c33dedc@google.com> Date: Wed, 15 Jan 2020 12:51:13 -0800 From: syzbot <syzbot+156a04714799b1d480bc@...kaller.appspotmail.com> To: coreteam@...filter.org, davem@...emloft.net, fw@...len.de, kadlec@...filter.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, netfilter-devel@...r.kernel.org, pablo@...filter.org, syzkaller-bugs@...glegroups.com Subject: general protection fault in nft_chain_parse_hook Hello, syzbot found the following crash on: HEAD commit: 4e2fa6b9 Merge branch 'bridge-add-vlan-notifications-and-r.. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=142f4a21e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=66d8660c57ff3c98 dashboard link: https://syzkaller.appspot.com/bug?extid=156a04714799b1d480bc compiler: gcc (GCC) 9.0.0 20181231 (experimental) 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: Reported-by: syzbot+156a04714799b1d480bc@...kaller.appspotmail.com kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 20602 Comm: syz-executor.1 Not tainted 5.5.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:nft_chain_parse_hook+0x386/0xa10 net/netfilter/nf_tables_api.c:1767 Code: e8 7f ae 09 fb 41 83 fd 05 0f 87 62 05 00 00 e8 f0 ac 09 fb 49 8d 7c 24 18 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e a6 05 00 00 44 89 e9 be 01 00 RSP: 0018:ffffc90001627100 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffffc900016272b0 RCX: ffffc90004e59000 RDX: 0000000000000003 RSI: ffffffff866b5350 RDI: 0000000000000018 RBP: ffffc900016271f0 R08: ffff8880648b4240 R09: 0000000000000000 R10: fffff520002c4e2f R11: ffffc9000162717f R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: ffffc900016271c8 FS: 00007f0770558700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fcdd829cdb8 CR3: 00000000a483c000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: nf_tables_addchain.constprop.0+0x1c1/0x1520 net/netfilter/nf_tables_api.c:1888 nf_tables_newchain+0x1033/0x1820 net/netfilter/nf_tables_api.c:2196 nfnetlink_rcv_batch+0xf42/0x17a0 net/netfilter/nfnetlink.c:433 nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:543 [inline] nfnetlink_rcv+0x3e7/0x460 net/netfilter/nfnetlink.c:561 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline] netlink_unicast+0x59e/0x7e0 net/netlink/af_netlink.c:1328 netlink_sendmsg+0x91c/0xea0 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:672 ____sys_sendmsg+0x753/0x880 net/socket.c:2343 ___sys_sendmsg+0x100/0x170 net/socket.c:2397 __sys_sendmsg+0x105/0x1d0 net/socket.c:2430 __do_sys_sendmsg net/socket.c:2439 [inline] __se_sys_sendmsg net/socket.c:2437 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2437 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45aff9 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f0770557c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f07705586d4 RCX: 000000000045aff9 RDX: 00000000040c4080 RSI: 000000002000c2c0 RDI: 0000000000000003 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000901 R14: 00000000004ca2fe R15: 000000000075bf2c Modules linked in: ---[ end trace c2d6a3781de0914d ]--- RIP: 0010:nft_chain_parse_hook+0x386/0xa10 net/netfilter/nf_tables_api.c:1767 Code: e8 7f ae 09 fb 41 83 fd 05 0f 87 62 05 00 00 e8 f0 ac 09 fb 49 8d 7c 24 18 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e a6 05 00 00 44 89 e9 be 01 00 RSP: 0018:ffffc90001627100 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: ffffc900016272b0 RCX: ffffc90004e59000 RDX: 0000000000000003 RSI: ffffffff866b5350 RDI: 0000000000000018 RBP: ffffc900016271f0 R08: ffff8880648b4240 R09: 0000000000000000 R10: fffff520002c4e2f R11: ffffc9000162717f R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: ffffc900016271c8 FS: 00007f0770558700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd461cd0000 CR3: 00000000a483c000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@...glegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
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