================================================================== BUG: KASAN: use-after-free in decode_session6+0xe7c/0x1580 net/xfrm/xfrm_policy.c:3393 Read of size 1 at addr ffff8880870968c9 by task syz-executor.1/7062 CPU: 0 PID: 7062 Comm: syz-executor.1 Not tainted 5.9.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x198/0x1fd lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530 decode_session6+0xe7c/0x1580 net/xfrm/xfrm_policy.c:3393 __xfrm_decode_session+0x50/0xb0 net/xfrm/xfrm_policy.c:3485 xfrm_decode_session include/net/xfrm.h:1137 [inline] vti6_tnl_xmit+0x40d/0x1cd0 net/ipv6/ip6_vti.c:581 __netdev_start_xmit include/linux/netdevice.h:4634 [inline] netdev_start_xmit include/linux/netdevice.h:4648 [inline] xmit_one net/core/dev.c:3561 [inline] dev_hard_start_xmit+0x193/0x950 net/core/dev.c:3577 sch_direct_xmit+0x2e1/0xbd0 net/sched/sch_generic.c:313 qdisc_restart net/sched/sch_generic.c:376 [inline] __qdisc_run+0x4b9/0x1620 net/sched/sch_generic.c:384 __dev_xmit_skb net/core/dev.c:3800 [inline] __dev_queue_xmit+0x199e/0x2d70 net/core/dev.c:4105 neigh_connected_output+0x299/0x370 net/core/neighbour.c:1518 neigh_output include/net/neighbour.h:509 [inline] ip6_finish_output2+0x8ac/0x1780 net/ipv6/ip6_output.c:117 __ip6_finish_output net/ipv6/ip6_output.c:143 [inline] __ip6_finish_output+0x447/0xab0 net/ipv6/ip6_output.c:128 ip6_finish_output+0x34/0x1f0 net/ipv6/ip6_output.c:153 NF_HOOK_COND include/linux/netfilter.h:290 [inline] ip6_output+0x1db/0x520 net/ipv6/ip6_output.c:176 dst_output include/net/dst.h:443 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ndisc_send_skb+0xa69/0x1720 net/ipv6/ndisc.c:506 ndisc_send_rs+0x12e/0x700 net/ipv6/ndisc.c:700 addrconf_rs_timer+0x2ec/0x7c0 net/ipv6/addrconf.c:3873 call_timer_fn+0x1ac/0x760 kernel/time/timer.c:1413 expire_timers kernel/time/timer.c:1458 [inline] __run_timers.part.0+0x67c/0xaa0 kernel/time/timer.c:1755 __run_timers kernel/time/timer.c:1736 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1768 __do_softirq+0x1f8/0xb23 kernel/softirq.c:298 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] do_softirq_own_stack+0x9d/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0x235/0x280 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x51/0xf0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581 RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x4/0x20 kernel/kcov.c:284 Code: 84 00 00 00 00 00 48 8b 0c 24 0f b7 d6 0f b7 f7 bf 03 00 00 00 e9 cc fe ff ff 66 90 66 2e 0f 1f 84 00 00 00 00 00 48 8b 0c 24 <89> f2 89 fe bf 05 00 00 00 e9 ae fe ff ff 0f 1f 40 00 66 2e 0f 1f RSP: 0018:ffffc90000ff7868 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000005 RCX: ffffffff836bfd47 RDX: ffff8880906b6180 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff888062bf0b80 R08: 0000000000000001 R09: ffffffff8d3583c7 R10: 0000000000000010 R11: 0000000000000000 R12: 0000000000000100 R13: 00000000000003d7 R14: dffffc0000000000 R15: 0000000000000000 tomoyo_domain_quota_is_ok+0x307/0x550 security/tomoyo/util.c:1071 tomoyo_supervisor+0x2f2/0xef0 security/tomoyo/common.c:2089 tomoyo_audit_path_log security/tomoyo/file.c:168 [inline] tomoyo_path_permission security/tomoyo/file.c:587 [inline] tomoyo_path_permission+0x270/0x3a0 security/tomoyo/file.c:573 tomoyo_path_perm+0x2f0/0x400 security/tomoyo/file.c:838 security_inode_getattr+0xcf/0x140 security/security.c:1278 vfs_getattr fs/stat.c:121 [inline] vfs_statx+0x170/0x390 fs/stat.c:206 vfs_lstat include/linux/fs.h:3178 [inline] __do_sys_newlstat+0x91/0x110 fs/stat.c:374 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45c9b5 Code: d4 ff ff ff 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 83 ff 01 48 89 f0 77 30 48 89 c7 48 89 d6 b8 06 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 03 f3 c3 90 48 c7 c2 d4 ff ff ff f7 d8 64 89 RSP: 002b:000000000169ecb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000006 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045c9b5 RDX: 000000000169ecd0 RSI: 000000000169ecd0 RDI: 000000000169ed60 RBP: 0000000000000b51 R08: 0000000000000000 R09: 0000000000000011 R10: 000000000000000a R11: 0000000000000246 R12: 000000000169fdf0 R13: 00000000021a9a60 R14: 0000000000000000 R15: 000000000169fdf0 Allocated by task 4800: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0xae/0x550 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1094 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:501 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:558 [inline] nsim_dev_trap_report_work+0x2ac/0xbd0 drivers/net/netdevsim/dev.c:599 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Freed by task 4800: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track+0x1c/0x30 mm/kasan/common.c:56 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:355 __kasan_slab_free+0xd8/0x120 mm/kasan/common.c:422 __cache_free mm/slab.c:3418 [inline] kfree+0x10e/0x2b0 mm/slab.c:3756 skb_free_head net/core/skbuff.c:590 [inline] skb_release_data+0x6d9/0x910 net/core/skbuff.c:610 skb_release_all net/core/skbuff.c:664 [inline] __kfree_skb net/core/skbuff.c:678 [inline] consume_skb net/core/skbuff.c:838 [inline] consume_skb+0xc2/0x160 net/core/skbuff.c:832 nsim_dev_trap_report drivers/net/netdevsim/dev.c:574 [inline] nsim_dev_trap_report_work+0x86f/0xbd0 drivers/net/netdevsim/dev.c:599 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 The buggy address belongs to the object at ffff888087096000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 2249 bytes inside of 4096-byte region [ffff888087096000, ffff888087097000) The buggy address belongs to the page: page:00000000f9dfda33 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x87096 head:00000000f9dfda33 order:1 compound_mapcount:0 flags: 0xfffe0000010200(slab|head) raw: 00fffe0000010200 ffffea00021c2508 ffffea0000893b08 ffff8880aa040900 raw: 0000000000000000 ffff888087096000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888087096780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888087096800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888087096880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888087096900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888087096980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================