general protection fault, probably for non-canonical address 0xdffffc0000000104: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000820-0x0000000000000827] CPU: 1 PID: 8261 Comm: syz-executor.4 Not tainted 5.8.0-rc5-next-20200714-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:ipv6_addr_equal include/net/ipv6.h:579 [inline] RIP: 0010:xfrm6_addr_equal include/net/xfrm.h:1699 [inline] RIP: 0010:__xfrm6_tunnel_spi_lookup+0x22b/0x3b0 net/ipv6/xfrm6_tunnel.c:82 Code: 89 e0 48 c1 e8 03 80 3c 28 00 0f 85 5b 01 00 00 4d 8b 24 24 4d 85 e4 74 53 e8 81 59 7b fa 49 8d 7c 24 20 48 89 f8 48 c1 e8 03 <80> 3c 28 00 0f 85 2d 01 00 00 4d 8b 7c 24 20 49 8d 7c 24 28 48 89 RSP: 0018:ffffc9001735f3f0 EFLAGS: 00010202 RAX: 0000000000000104 RBX: 000000000000ffff RCX: ffffc900119f4000 RDX: 0000000000040000 RSI: ffffffff86f8d7ef RDI: 0000000000000820 RBP: dffffc0000000000 R08: 0000000000000001 R09: ffff88809c29cd90 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000800 R13: ffffffffffff0000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fd281a5f700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055ce37926000 CR3: 000000009e123000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: xfrm6_tunnel_spi_lookup+0x8a/0x1d0 net/ipv6/xfrm6_tunnel.c:95 ipcomp6_tunnel_attach net/ipv6/ipcomp6.c:119 [inline] ipcomp6_init_state net/ipv6/ipcomp6.c:159 [inline] ipcomp6_init_state+0x1de/0x700 net/ipv6/ipcomp6.c:139 __xfrm_init_state+0x9a6/0x14b0 net/xfrm/xfrm_state.c:2498 xfrm_state_construct net/xfrm/xfrm_user.c:627 [inline] xfrm_add_sa+0x1db9/0x34f0 net/xfrm/xfrm_user.c:684 xfrm_user_rcv_msg+0x414/0x700 net/xfrm/xfrm_user.c:2684 netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2469 xfrm_netlink_rcv+0x6b/0x90 net/xfrm/xfrm_user.c:2692 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:671 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2362 ___sys_sendmsg+0xf3/0x170 net/socket.c:2416 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2449 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45cba9 Code: Bad RIP value. RSP: 002b:00007fd281a5ec78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000503da0 RCX: 000000000045cba9 RDX: 0000000000000000 RSI: 0000000020000840 RDI: 0000000000000003 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000a7c R14: 00000000004cd58f R15: 00007fd281a5f6d4 Modules linked in: ---[ end trace a3a478e01cce7603 ]--- RIP: 0010:ipv6_addr_equal include/net/ipv6.h:579 [inline] RIP: 0010:xfrm6_addr_equal include/net/xfrm.h:1699 [inline] RIP: 0010:__xfrm6_tunnel_spi_lookup+0x22b/0x3b0 net/ipv6/xfrm6_tunnel.c:82 Code: 89 e0 48 c1 e8 03 80 3c 28 00 0f 85 5b 01 00 00 4d 8b 24 24 4d 85 e4 74 53 e8 81 59 7b fa 49 8d 7c 24 20 48 89 f8 48 c1 e8 03 <80> 3c 28 00 0f 85 2d 01 00 00 4d 8b 7c 24 20 49 8d 7c 24 28 48 89 RSP: 0018:ffffc9001735f3f0 EFLAGS: 00010202 RAX: 0000000000000104 RBX: 000000000000ffff RCX: ffffc900119f4000 RDX: 0000000000040000 RSI: ffffffff86f8d7ef RDI: 0000000000000820 RBP: dffffc0000000000 R08: 0000000000000001 R09: ffff88809c29cd90 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000800 R13: ffffffffffff0000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fd281a5f700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055ce37926000 CR3: 000000009e123000 CR4: 00000000001526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400