================================================================== BUG: KASAN: slab-out-of-bounds in decode_session6 net/xfrm/xfrm_policy.c:3390 [inline] BUG: KASAN: slab-out-of-bounds in __xfrm_decode_session+0x1cfb/0x2e90 net/xfrm/xfrm_policy.c:3482 Read of size 1 at addr ffff8880915d1b49 by task kworker/0:0/16350 CPU: 0 PID: 16350 Comm: kworker/0:0 Not tainted 5.3.0+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events rt6_probe_deferred Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506 kasan_report+0x12/0x20 mm/kasan/common.c:634 __asan_report_load1_noabort+0x14/0x20 mm/kasan/generic_report.c:129 decode_session6 net/xfrm/xfrm_policy.c:3390 [inline] __xfrm_decode_session+0x1cfb/0x2e90 net/xfrm/xfrm_policy.c:3482 xfrm_decode_session include/net/xfrm.h:1137 [inline] vti_tunnel_xmit+0x277/0x17a0 net/ipv4/ip_vti.c:269 __netdev_start_xmit include/linux/netdevice.h:4420 [inline] netdev_start_xmit include/linux/netdevice.h:4434 [inline] xmit_one net/core/dev.c:3280 [inline] dev_hard_start_xmit+0x1a3/0x9b0 net/core/dev.c:3296 sch_direct_xmit+0x372/0xc30 net/sched/sch_generic.c:313 qdisc_restart net/sched/sch_generic.c:376 [inline] __qdisc_run+0x577/0x1a00 net/sched/sch_generic.c:384 __dev_xmit_skb net/core/dev.c:3537 [inline] __dev_queue_xmit+0x169d/0x3720 net/core/dev.c:3842 dev_queue_xmit+0x18/0x20 net/core/dev.c:3906 neigh_direct_output+0x16/0x20 net/core/neighbour.c:1530 neigh_output include/net/neighbour.h:511 [inline] ip6_finish_output2+0x1034/0x2550 net/ipv6/ip6_output.c:116 __ip6_finish_output+0x444/0xaa0 net/ipv6/ip6_output.c:142 ip6_finish_output+0x38/0x1f0 net/ipv6/ip6_output.c:152 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip6_output+0x235/0x7f0 net/ipv6/ip6_output.c:175 dst_output include/net/dst.h:436 [inline] NF_HOOK include/linux/netfilter.h:305 [inline] ndisc_send_skb+0xf29/0x14a0 net/ipv6/ndisc.c:505 ndisc_send_ns+0x3a9/0x850 net/ipv6/ndisc.c:647 rt6_probe_deferred+0xe3/0x1a0 net/ipv6/route.c:615 process_one_work+0x9af/0x1740 kernel/workqueue.c:2269 worker_thread+0x98/0xe40 kernel/workqueue.c:2415 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Allocated by task 3892: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc mm/kasan/common.c:510 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:483 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:524 __do_kmalloc mm/slab.c:3655 [inline] __kmalloc+0x163/0x770 mm/slab.c:3664 kmalloc include/linux/slab.h:557 [inline] tomoyo_realpath_from_path+0xcd/0x7b0 security/tomoyo/realpath.c:277 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_number_perm+0x1dd/0x520 security/tomoyo/file.c:723 tomoyo_file_ioctl+0x23/0x30 security/tomoyo/tomoyo.c:335 security_file_ioctl+0x77/0xc0 security/security.c:1375 ksys_ioctl+0x57/0xd0 fs/ioctl.c:711 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 3892: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] kasan_set_free_info mm/kasan/common.c:332 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:471 kasan_slab_free+0xe/0x10 mm/kasan/common.c:480 __cache_free mm/slab.c:3425 [inline] kfree+0x10a/0x2c0 mm/slab.c:3756 tomoyo_realpath_from_path+0x1de/0x7b0 security/tomoyo/realpath.c:319 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_number_perm+0x1dd/0x520 security/tomoyo/file.c:723 tomoyo_file_ioctl+0x23/0x30 security/tomoyo/tomoyo.c:335 security_file_ioctl+0x77/0xc0 security/security.c:1375 ksys_ioctl+0x57/0xd0 fs/ioctl.c:711 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880915d0680 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 1225 bytes to the right of 4096-byte region [ffff8880915d0680, ffff8880915d1680) The buggy address belongs to the page: page:ffffea0002457400 refcount:1 mapcount:0 mapping:ffff8880aa402000 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea0000d97208 ffffea00025a7b88 ffff8880aa402000 raw: 0000000000000000 ffff8880915d0680 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880915d1a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880915d1a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880915d1b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880915d1b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880915d1c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================