================================================================== BUG: KASAN: use-after-free in decode_session6+0xe6d/0x1530 net/xfrm/xfrm_policy.c:3369 Read of size 1 at addr ffff88807bf36ef6 by task syz-executor.4/13891 CPU: 1 PID: 13891 Comm: syz-executor.4 Not tainted 5.16.0-rc8-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x8d/0x320 mm/kasan/report.c:247 __kasan_report mm/kasan/report.c:433 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:450 decode_session6+0xe6d/0x1530 net/xfrm/xfrm_policy.c:3369 __xfrm_decode_session+0x50/0xb0 net/xfrm/xfrm_policy.c:3456 xfrm_decode_session include/net/xfrm.h:1149 [inline] vti6_tnl_xmit+0x41f/0x1fe0 net/ipv6/ip6_vti.c:577 __netdev_start_xmit include/linux/netdevice.h:4994 [inline] netdev_start_xmit include/linux/netdevice.h:5008 [inline] xmit_one net/core/dev.c:3590 [inline] dev_hard_start_xmit+0x1eb/0x920 net/core/dev.c:3606 sch_direct_xmit+0x19f/0xbe0 net/sched/sch_generic.c:342 qdisc_restart net/sched/sch_generic.c:407 [inline] __qdisc_run+0x4bc/0x1700 net/sched/sch_generic.c:415 __dev_xmit_skb net/core/dev.c:3875 [inline] __dev_queue_xmit+0x2091/0x3650 net/core/dev.c:4194 neigh_connected_output+0x3b6/0x510 net/core/neighbour.c:1551 neigh_output include/net/neighbour.h:527 [inline] ip6_finish_output2+0x571/0x14e0 net/ipv6/ip6_output.c:126 ip6_fragment+0xa8f/0x2700 net/ipv6/ip6_output.c:966 __ip6_finish_output net/ipv6/ip6_output.c:189 [inline] __ip6_finish_output+0x5fa/0x1050 net/ipv6/ip6_output.c:170 ip6_finish_output+0x32/0x200 net/ipv6/ip6_output.c:201 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip6_output+0x1e4/0x530 net/ipv6/ip6_output.c:224 dst_output include/net/dst.h:450 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ip6_xmit+0x11e9/0x1a60 net/ipv6/ip6_output.c:324 sctp_v6_xmit+0xcc1/0x1100 net/sctp/ipv6.c:250 sctp_packet_transmit+0x1c9a/0x3070 net/sctp/output.c:652 sctp_packet_singleton+0x190/0x360 net/sctp/outqueue.c:777 sctp_outq_flush_ctrl.constprop.0+0x5dc/0xab0 net/sctp/outqueue.c:908 sctp_outq_flush net/sctp/outqueue.c:1202 [inline] sctp_outq_uncork+0x10b/0x200 net/sctp/outqueue.c:758 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1812 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1195 [inline] sctp_do_sm+0x745/0x4ec0 net/sctp/sm_sideeffect.c:1166 sctp_primitive_ASSOCIATE+0x98/0xc0 net/sctp/primitive.c:73 sctp_sendmsg_to_asoc+0xb8c/0x2390 net/sctp/socket.c:1837 sctp_sendmsg+0x103b/0x1d30 net/sctp/socket.c:2027 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:819 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2409 ___sys_sendmsg+0xf3/0x170 net/socket.c:2463 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2492 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fe858528e99 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe856e9e168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fe85863bf60 RCX: 00007fe858528e99 RDX: 0000000000000000 RSI: 0000000020000bc0 RDI: 0000000000000003 RBP: 00007fe858582ff1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcee25279f R14: 00007fe856e9e300 R15: 0000000000022000 Allocated by task 13157: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] ____kasan_kmalloc mm/kasan/common.c:472 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:522 kmalloc include/linux/slab.h:590 [inline] kzalloc include/linux/slab.h:724 [inline] kobject_uevent_env+0x240/0x1650 lib/kobject_uevent.c:524 __kobject_del+0x169/0x200 lib/kobject.c:617 kobject_cleanup lib/kobject.c:696 [inline] kobject_release lib/kobject.c:736 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x2b6/0x540 lib/kobject.c:753 netdev_queue_update_kobjects+0x310/0x460 net/core/net-sysfs.c:1725 remove_queue_kobjects net/core/net-sysfs.c:1822 [inline] netdev_unregister_kobject+0x15b/0x1f0 net/core/net-sysfs.c:1972 unregister_netdevice_many+0xd1f/0x1790 net/core/dev.c:11107 rtnl_delete_link net/core/rtnetlink.c:3063 [inline] rtnl_dellink+0x354/0xa80 net/core/rtnetlink.c:3115 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5571 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2496 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x904/0xdf0 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2409 ___sys_sendmsg+0xf3/0x170 net/socket.c:2463 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2492 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 7278: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0xff/0x130 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:1723 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1749 slab_free mm/slub.c:3513 [inline] kfree+0xf6/0x560 mm/slub.c:4561 skb_free_head net/core/skbuff.c:655 [inline] skb_release_data+0x65a/0x790 net/core/skbuff.c:677 skb_release_all net/core/skbuff.c:742 [inline] __kfree_skb net/core/skbuff.c:756 [inline] consume_skb net/core/skbuff.c:912 [inline] consume_skb+0xc2/0x160 net/core/skbuff.c:906 nsim_dev_trap_report drivers/net/netdevsim/dev.c:818 [inline] nsim_dev_trap_report_work+0x85d/0xbc0 drivers/net/netdevsim/dev.c:843 process_one_work+0x9b2/0x1660 kernel/workqueue.c:2298 worker_thread+0x65d/0x1130 kernel/workqueue.c:2445 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff88807bf36000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 3830 bytes inside of 4096-byte region [ffff88807bf36000, ffff88807bf37000) The buggy address belongs to the page: page:ffffea0001efcc00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7bf30 head:ffffea0001efcc00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea000050e800 dead000000000002 ffff888010c42140 raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 27730, ts 876794632656, free_ts 868213373815 prep_new_page mm/page_alloc.c:2418 [inline] get_page_from_freelist+0xa72/0x2f50 mm/page_alloc.c:4149 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5369 alloc_pages+0x1a7/0x300 mm/mempolicy.c:2190 alloc_slab_page mm/slub.c:1793 [inline] allocate_slab mm/slub.c:1930 [inline] new_slab+0x32d/0x4a0 mm/slub.c:1993 ___slab_alloc+0x918/0xfe0 mm/slub.c:3022 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3109 slab_alloc_node mm/slub.c:3200 [inline] slab_alloc mm/slub.c:3242 [inline] kmem_cache_alloc_trace+0x289/0x2c0 mm/slub.c:3259 kmalloc include/linux/slab.h:590 [inline] kzalloc include/linux/slab.h:724 [inline] kobject_uevent_env+0x240/0x1650 lib/kobject_uevent.c:524 device_add+0xbb4/0x1ee0 drivers/base/core.c:3375 netdev_register_kobject+0x181/0x430 net/core/net-sysfs.c:2010 register_netdevice+0xd31/0x1500 net/core/dev.c:10336 register_netdev+0x2d/0x50 net/core/dev.c:10460 loopback_net_init+0x73/0x160 drivers/net/loopback.c:216 ops_init+0xaf/0x470 net/core/net_namespace.c:140 setup_net+0x40f/0xa30 net/core/net_namespace.c:326 copy_net_ns+0x318/0x760 net/core/net_namespace.c:470 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1338 [inline] free_pcp_prepare+0x374/0x870 mm/page_alloc.c:1389 free_unref_page_prepare mm/page_alloc.c:3309 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3388 __unfreeze_partials+0x343/0x360 mm/slub.c:2527 qlink_free mm/kasan/quarantine.c:146 [inline] qlist_free_all+0x5a/0xc0 mm/kasan/quarantine.c:165 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:259 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slub.c:3234 [inline] slab_alloc mm/slub.c:3242 [inline] kmem_cache_alloc+0x142/0x3a0 mm/slub.c:3247 kmem_cache_zalloc include/linux/slab.h:714 [inline] jbd2_alloc_handle include/linux/jbd2.h:1603 [inline] new_handle fs/jbd2/transaction.c:481 [inline] jbd2__journal_start+0x191/0x930 fs/jbd2/transaction.c:508 __ext4_journal_start_sb+0x227/0x4a0 fs/ext4/ext4_jbd2.c:105 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline] ext4_alloc_file_blocks.isra.0+0x286/0xae0 fs/ext4/extents.c:4466 ext4_zero_range fs/ext4/extents.c:4621 [inline] ext4_fallocate+0x2ec7/0x41d0 fs/ext4/extents.c:4722 vfs_fallocate+0x48d/0xe10 fs/open.c:307 ioctl_preallocate+0x18e/0x200 fs/ioctl.c:294 file_ioctl fs/ioctl.c:339 [inline] do_vfs_ioctl+0x116f/0x15d0 fs/ioctl.c:853 __do_sys_ioctl fs/ioctl.c:872 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x108/0x200 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 Memory state around the buggy address: ffff88807bf36d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807bf36e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807bf36e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807bf36f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807bf36f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================