BUG: KASAN: stack-out-of-bounds in xfrm_state_find+0x305b/0x3190 net/xfrm/xfrm_state.c:1051 Read of size 4 at addr ffff8801cc8ee708 by task syzkaller075845/3020 CPU: 0 PID: 3020 Comm: syzkaller075845 Not tainted 4.14.0-rc2+ #10 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:52 print_address_description+0x73/0x250 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report+0x25b/0x340 mm/kasan/report.c:409 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:429 xfrm_state_find+0x305b/0x3190 net/xfrm/xfrm_state.c:1051 xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:1388 [inline] xfrm_tmpl_resolve+0x2fb/0xbd0 net/xfrm/xfrm_policy.c:1432 xfrm_resolve_and_create_bundle+0x186/0x24b0 net/xfrm/xfrm_policy.c:1830 xfrm_lookup+0xf0a/0x2540 net/xfrm/xfrm_policy.c:2141 xfrm_lookup_route+0x39/0x1a0 net/xfrm/xfrm_policy.c:2259 ip_route_output_flow+0x7c/0xa0 net/ipv4/route.c:2549 inet_csk_route_req+0x5d8/0x990 net/ipv4/inet_connection_sock.c:552 tcp_v4_send_synack+0x1e4/0x270 net/ipv4/tcp_ipv4.c:870 tcp_rtx_synack+0x119/0x2e0 net/ipv4/tcp_output.c:3695 inet_rtx_syn_ack+0x64/0xd0 net/ipv4/inet_connection_sock.c:636 tcp_check_req+0xaf5/0x1630 net/ipv4/tcp_minisocks.c:614 tcp_v4_rcv+0x17b0/0x2f20 net/ipv4/tcp_ipv4.c:1674 ip_local_deliver_finish+0x2e2/0xba0 net/ipv4/ip_input.c:216 NF_HOOK include/linux/netfilter.h:249 [inline] ip_local_deliver+0x1ce/0x6e0 net/ipv4/ip_input.c:257 dst_input include/net/dst.h:464 [inline] ip_rcv_finish+0x8db/0x19c0 net/ipv4/ip_input.c:397 NF_HOOK include/linux/netfilter.h:249 [inline] ip_rcv+0xc3f/0x17d0 net/ipv4/ip_input.c:488 __netif_receive_skb_core+0x19af/0x33d0 net/core/dev.c:4428 __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4466 netif_receive_skb_internal+0x10b/0x670 net/core/dev.c:4539 netif_receive_skb+0xae/0x390 net/core/dev.c:4563 tun_rx_batched.isra.43+0x5ed/0x860 drivers/net/tun.c:1218 tun_get_user+0x11dd/0x2150 drivers/net/tun.c:1553 tun_chr_write_iter+0xde/0x190 drivers/net/tun.c:1579 call_write_iter include/linux/fs.h:1770 [inline] new_sync_write fs/read_write.c:468 [inline] __vfs_write+0x68a/0x970 fs/read_write.c:481 vfs_write+0x18f/0x510 fs/read_write.c:543 SYSC_write fs/read_write.c:588 [inline] SyS_write+0xef/0x220 fs/read_write.c:580 do_syscall_32_irqs_on arch/x86/entry/common.c:329 [inline] do_fast_syscall_32+0x3f2/0xf05 arch/x86/entry/common.c:391 entry_SYSENTER_compat+0x51/0x60 arch/x86/entry/entry_64_compat.S:124 RIP: 0023:0xf7f41c79 RSP: 002b:00000000f2f331f4 EFLAGS: 00000292 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020002000 RDX: 0000000000000036 RSI: 0000000000000000 RDI: 00000000003d0f00 RBP: 00000000f2f332e8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 The buggy address belongs to the page: page:ffffea0007323b80 count:0 mapcount:0 mapping: (null) index:0xffff8801cc8ee080 flags: 0x200000000000000() raw: 0200000000000000 0000000000000000 ffff8801cc8ee080 00000000ffffffff raw: 0000000000000000 dead000000000200 0000000000000000 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801cc8ee600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801cc8ee680: 00 00 00 00 00 00 f1 f1 f1 f1 00 00 00 00 00 00 >ffff8801cc8ee700: 00 f2 f3 f3 f3 f3 00 00 00 00 00 00 00 f1 f1 f1 ^ ffff8801cc8ee780: f1 00 00 00 00 00 00 00 00 00 00 00 f2 f3 f3 f3 ffff8801cc8ee800: f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================