================================================================== BUG: KASAN: use-after-free in decode_session6 net/xfrm/xfrm_policy.c:3371 [inline] BUG: KASAN: use-after-free in __xfrm_decode_session+0x1843/0x21c0 net/xfrm/xfrm_policy.c:3458 Read of size 1 at addr ffff88806f87a2cf by task syz-executor.3/2811 CPU: 0 PID: 2811 Comm: syz-executor.3 Not tainted 5.15.0-rc7-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+0x1dc/0x2d8 lib/dump_stack.c:106 print_address_description+0x66/0x3e0 mm/kasan/report.c:256 __kasan_report mm/kasan/report.c:442 [inline] kasan_report+0x19a/0x1f0 mm/kasan/report.c:459 decode_session6 net/xfrm/xfrm_policy.c:3371 [inline] __xfrm_decode_session+0x1843/0x21c0 net/xfrm/xfrm_policy.c:3458 xfrm_decode_session_reverse include/net/xfrm.h:1156 [inline] icmpv6_route_lookup+0x42f/0x690 net/ipv6/icmp.c:393 icmp6_send+0x18fb/0x2a40 net/ipv6/icmp.c:597 __icmpv6_send include/linux/icmpv6.h:28 [inline] icmpv6_send include/linux/icmpv6.h:49 [inline] ip6_link_failure+0x37/0x450 net/ipv6/route.c:2790 dst_link_failure include/net/dst.h:429 [inline] ip6_tnl_xmit+0x8de/0x3120 net/ipv6/ip6_tunnel.c:1265 ipxip6_tnl_xmit net/ipv6/ip6_tunnel.c:1381 [inline] ip6_tnl_start_xmit+0xfcf/0x16a0 net/ipv6/ip6_tunnel.c:1430 __netdev_start_xmit include/linux/netdevice.h:4988 [inline] netdev_start_xmit include/linux/netdevice.h:5002 [inline] xmit_one net/core/dev.c:3582 [inline] dev_hard_start_xmit+0x20b/0x450 net/core/dev.c:3598 sch_direct_xmit+0x292/0x5b0 net/sched/sch_generic.c:342 qdisc_restart net/sched/sch_generic.c:407 [inline] __qdisc_run+0x9dc/0x1cd0 net/sched/sch_generic.c:415 __dev_xmit_skb net/core/dev.c:3867 [inline] __dev_queue_xmit+0xe8b/0x34c0 net/core/dev.c:4177 neigh_output include/net/neighbour.h:510 [inline] ip6_finish_output2+0xf07/0x14c0 net/ipv6/ip6_output.c:126 ip6_send_skb+0x109/0x220 net/ipv6/ip6_output.c:1912 rawv6_push_pending_frames net/ipv6/raw.c:613 [inline] rawv6_sendmsg+0x2ee6/0x4320 net/ipv6/raw.c:956 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg net/socket.c:724 [inline] ____sys_sendmsg+0x5b9/0x910 net/socket.c:2409 ___sys_sendmsg net/socket.c:2463 [inline] __sys_sendmsg+0x36f/0x450 net/socket.c:2492 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fa9e8361a39 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:00007fa9e58b6188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fa9e8475020 RCX: 00007fa9e8361a39 RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000003 RBP: 00007fa9e83bbe8f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc18cf91ef R14: 00007fa9e58b6300 R15: 0000000000022000 Allocated by task 0: (stack is not available) Freed by task 8570: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360 ____kasan_slab_free+0x10d/0x150 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1700 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1726 slab_free mm/slub.c:3492 [inline] kfree+0xe1/0x310 mm/slub.c:4552 skb_free_head net/core/skbuff.c:655 [inline] skb_release_data+0x3c3/0x4f0 net/core/skbuff.c:677 skb_release_all net/core/skbuff.c:742 [inline] __kfree_skb+0x56/0x1d0 net/core/skbuff.c:756 nsim_dev_trap_report drivers/net/netdevsim/dev.c:737 [inline] nsim_dev_trap_report_work+0x7d5/0xb20 drivers/net/netdevsim/dev.c:762 process_one_work+0x853/0x1140 kernel/workqueue.c:2297 worker_thread+0xac1/0x1320 kernel/workqueue.c:2444 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 The buggy address belongs to the object at ffff88806f87a000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 719 bytes inside of 4096-byte region [ffff88806f87a000, ffff88806f87b000) The buggy address belongs to the page: page:ffffea0001be1e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x6f878 head:ffffea0001be1e00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000122 ffff888011042140 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 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 8570, ts 906672967716, free_ts 899944532648 prep_new_page mm/page_alloc.c:2424 [inline] get_page_from_freelist+0x779/0xa30 mm/page_alloc.c:4153 __alloc_pages+0x255/0x580 mm/page_alloc.c:5375 alloc_slab_page mm/slub.c:1770 [inline] allocate_slab+0xcc/0x4d0 mm/slub.c:1907 new_slab mm/slub.c:1970 [inline] ___slab_alloc+0x41e/0xc40 mm/slub.c:3001 __slab_alloc mm/slub.c:3088 [inline] slab_alloc_node mm/slub.c:3179 [inline] __kmalloc_node_track_caller+0x2d9/0x3e0 mm/slub.c:4947 kmalloc_reserve net/core/skbuff.c:356 [inline] __alloc_skb+0x127/0x580 net/core/skbuff.c:427 alloc_skb include/linux/skbuff.h:1116 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:664 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:721 [inline] nsim_dev_trap_report_work+0x274/0xb20 drivers/net/netdevsim/dev.c:762 process_one_work+0x853/0x1140 kernel/workqueue.c:2297 worker_thread+0xac1/0x1320 kernel/workqueue.c:2444 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 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+0xc29/0xd20 mm/page_alloc.c:1389 free_unref_page_prepare mm/page_alloc.c:3315 [inline] free_unref_page+0x7d/0x580 mm/page_alloc.c:3394 free_slab mm/slub.c:2010 [inline] discard_slab mm/slub.c:2016 [inline] __unfreeze_partials+0x1ab/0x200 mm/slub.c:2502 put_cpu_partial+0x132/0x1a0 mm/slub.c:2582 do_slab_free mm/slub.c:3480 [inline] ___cache_free+0xe6/0x120 mm/slub.c:3499 qlist_free_all mm/kasan/quarantine.c:165 [inline] kasan_quarantine_reduce+0x151/0x1c0 mm/kasan/quarantine.c:272 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slub.c:3213 [inline] slab_alloc mm/slub.c:3221 [inline] kmem_cache_alloc_trace+0x205/0x310 mm/slub.c:3238 kmalloc include/linux/slab.h:591 [inline] kzalloc include/linux/slab.h:721 [inline] kobject_uevent_env+0x27e/0x1700 lib/kobject_uevent.c:524 nfs_netns_sysfs_destroy+0x50/0x90 fs/nfs/sysfs.c:186 nfs_clients_exit+0x49/0x130 fs/nfs/client.c:1133 ops_exit_list net/core/net_namespace.c:168 [inline] cleanup_net+0x758/0xc50 net/core/net_namespace.c:591 process_one_work+0x853/0x1140 kernel/workqueue.c:2297 worker_thread+0xac1/0x1320 kernel/workqueue.c:2444 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 Memory state around the buggy address: ffff88806f87a180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88806f87a200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88806f87a280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88806f87a300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88806f87a380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================