================================================================== BUG: KASAN: use-after-free in __nf_ct_ext_exist include/net/netfilter/nf_conntrack_extend.h:47 [inline] BUG: KASAN: use-after-free in nf_ct_ext_exist include/net/netfilter/nf_conntrack_extend.h:52 [inline] BUG: KASAN: use-after-free in nf_ct_ecache_exist include/net/netfilter/nf_conntrack_ecache.h:42 [inline] BUG: KASAN: use-after-free in nf_conntrack_confirm include/net/netfilter/nf_conntrack_core.h:63 [inline] BUG: KASAN: use-after-free in nf_confirm+0x4f2/0x520 net/netfilter/nf_conntrack_proto.c:154 BUG: KASAN: use-after-free in __nf_ct_ext_exist include/net/netfilter/nf_conntrack_extend.h:47 [inline] BUG: KASAN: use-after-free in nf_ct_ext_exist include/net/netfilter/nf_conntrack_extend.h:52 [inline] BUG: KASAN: use-after-free in nf_ct_ecache_exist include/net/netfilter/nf_conntrack_ecache.h:42 [inline] BUG: KASAN: use-after-free in nf_conntrack_confirm include/net/netfilter/nf_conntrack_core.h:63 [inline] BUG: KASAN: use-after-free in nf_confirm+0x4f2/0x520 net/netfilter/nf_conntrack_proto.c:154 Read of size 1 at addr ffff88807a05aa04 by task syz-executor.3/12003 CPU: 1 PID: 12003 Comm: syz-executor.3 Not tainted 5.18.0-syzkaller-11712-g700170bf6b4d #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+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description+0x65/0x4b0 mm/kasan/report.c:313 print_report+0xf4/0x210 mm/kasan/report.c:429 kasan_report+0xfb/0x130 mm/kasan/report.c:491 __nf_ct_ext_exist include/net/netfilter/nf_conntrack_extend.h:47 [inline] nf_ct_ext_exist include/net/netfilter/nf_conntrack_extend.h:52 [inline] nf_ct_ecache_exist include/net/netfilter/nf_conntrack_ecache.h:42 [inline] nf_conntrack_confirm include/net/netfilter/nf_conntrack_core.h:63 [inline] nf_confirm+0x4f2/0x520 net/netfilter/nf_conntrack_proto.c:154 ipv6_confirm+0x4fb/0x6b0 net/netfilter/nf_conntrack_proto.c:400 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline] nf_hook_slow+0xae/0x1e0 net/netfilter/core.c:620 nf_hook+0x26e/0x3d0 include/linux/netfilter.h:262 NF_HOOK_COND include/linux/netfilter.h:295 [inline] ip6_output+0x291/0x3d0 net/ipv6/ip6_output.c:227 ip6_send_skb+0x109/0x220 net/ipv6/ip6_output.c:1947 udp_v6_send_skb+0xafc/0x1480 net/ipv6/udp.c:1259 udpv6_sendmsg+0x22b4/0x3130 net/ipv6/udp.c:1551 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline] kernel_sendmsg+0xf5/0x130 net/socket.c:754 rxrpc_send_data_packet+0xc1c/0x1d20 net/rxrpc/output.c:451 rxrpc_queue_packet net/rxrpc/sendmsg.c:258 [inline] rxrpc_send_data+0x171e/0x2700 net/rxrpc/sendmsg.c:437 rxrpc_do_sendmsg+0x16ca/0x1a20 net/rxrpc/sendmsg.c:750 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline] ____sys_sendmsg+0x597/0x8e0 net/socket.c:2492 ___sys_sendmsg net/socket.c:2546 [inline] __sys_sendmsg+0x284/0x370 net/socket.c:2575 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7f2ddba89109 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2ddcc32168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f2ddbb9bf60 RCX: 00007f2ddba89109 RDX: 0000000000000000 RSI: 0000000020000180 RDI: 0000000000000003 RBP: 00007f2ddbae308d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff647c4def R14: 00007f2ddcc32300 R15: 0000000000022000 Allocated by task 10154: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc+0xdc/0x110 mm/kasan/common.c:515 kasan_kmalloc include/linux/kasan.h:234 [inline] __kmalloc_node+0x262/0x400 mm/slub.c:4465 kmalloc_array_node include/linux/slab.h:695 [inline] kcalloc_node include/linux/slab.h:700 [inline] memcg_alloc_slab_cgroups+0x7c/0x120 mm/memcontrol.c:2818 account_slab mm/slab.h:653 [inline] allocate_slab+0xa6/0x520 mm/slub.c:1958 new_slab mm/slub.c:2002 [inline] ___slab_alloc+0x41e/0xcd0 mm/slub.c:3002 __slab_alloc mm/slub.c:3089 [inline] slab_alloc_node mm/slub.c:3180 [inline] __kmalloc_node_track_caller+0x2bb/0x3f0 mm/slub.c:4950 kmalloc_reserve net/core/skbuff.c:354 [inline] __alloc_skb+0x11d/0x660 net/core/skbuff.c:426 alloc_skb include/linux/skbuff.h:1426 [inline] alloc_skb_with_frags+0xb1/0x780 net/core/skbuff.c:5992 sock_alloc_send_pskb+0x930/0xa70 net/core/sock.c:2662 unix_dgram_sendmsg+0x5ca/0x1fc0 net/unix/af_unix.c:1895 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline] ____sys_sendmsg+0x597/0x8e0 net/socket.c:2492 ___sys_sendmsg net/socket.c:2546 [inline] __sys_sendmmsg+0x3d8/0x740 net/socket.c:2632 __do_sys_sendmmsg net/socket.c:2661 [inline] __se_sys_sendmmsg net/socket.c:2658 [inline] __x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2658 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Freed by task 12003: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0xd8/0x110 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1727 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1753 slab_free mm/slub.c:3507 [inline] kfree+0xc6/0x210 mm/slub.c:4555 nf_conntrack_free+0x256/0x2f0 net/netfilter/nf_conntrack_core.c:1680 nf_ct_put include/net/netfilter/nf_conntrack.h:184 [inline] __nf_ct_resolve_clash+0xa2f/0x10f0 net/netfilter/nf_conntrack_core.c:1013 nf_ct_resolve_clash+0xfc/0xbd8 net/netfilter/nf_conntrack_core.c:1136 __nf_conntrack_confirm+0x1b94/0x1d50 net/netfilter/nf_conntrack_core.c:1284 nf_conntrack_confirm include/net/netfilter/nf_conntrack_core.h:62 [inline] nf_confirm+0x38b/0x520 net/netfilter/nf_conntrack_proto.c:154 ipv6_confirm+0x4fb/0x6b0 net/netfilter/nf_conntrack_proto.c:400 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline] nf_hook_slow+0xae/0x1e0 net/netfilter/core.c:620 nf_hook+0x26e/0x3d0 include/linux/netfilter.h:262 NF_HOOK_COND include/linux/netfilter.h:295 [inline] ip6_output+0x291/0x3d0 net/ipv6/ip6_output.c:227 ip6_send_skb+0x109/0x220 net/ipv6/ip6_output.c:1947 udp_v6_send_skb+0xafc/0x1480 net/ipv6/udp.c:1259 udpv6_sendmsg+0x22b4/0x3130 net/ipv6/udp.c:1551 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline] kernel_sendmsg+0xf5/0x130 net/socket.c:754 rxrpc_send_data_packet+0xc1c/0x1d20 net/rxrpc/output.c:451 rxrpc_queue_packet net/rxrpc/sendmsg.c:258 [inline] rxrpc_send_data+0x171e/0x2700 net/rxrpc/sendmsg.c:437 rxrpc_do_sendmsg+0x16ca/0x1a20 net/rxrpc/sendmsg.c:750 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline] ____sys_sendmsg+0x597/0x8e0 net/socket.c:2492 ___sys_sendmsg net/socket.c:2546 [inline] __sys_sendmsg+0x284/0x370 net/socket.c:2575 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:348 kvfree_call_rcu+0x118/0x840 kernel/rcu/tree.c:3647 __hw_addr_flush net/core/dev_addr_lists.c:490 [inline] dev_addr_flush+0x17b/0x220 net/core/dev_addr_lists.c:535 free_netdev+0x1f3/0x4e0 net/core/dev.c:10698 netdev_run_todo+0xeec/0x1070 net/core/dev.c:10352 ip6gre_exit_batch_net+0x45a/0x4a0 net/ipv6/ip6_gre.c:1629 ops_exit_list net/core/net_namespace.c:167 [inline] cleanup_net+0x80c/0xc50 net/core/net_namespace.c:594 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 The buggy address belongs to the object at ffff88807a05aa00 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 4 bytes inside of 128-byte region [ffff88807a05aa00, ffff88807a05aa80) The buggy address belongs to the physical page: page:ffffea0001e81680 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7a05a flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea0001502c40 dead000000000002 ffff8880114418c0 raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 8817, tgid 8815 (syz-executor.2), ts 244807398748, free_ts 157394492176 prep_new_page mm/page_alloc.c:2456 [inline] get_page_from_freelist+0x72b/0x7a0 mm/page_alloc.c:4198 __alloc_pages+0x259/0x560 mm/page_alloc.c:5426 alloc_slab_page+0x70/0xf0 mm/slub.c:1797 allocate_slab+0x5e/0x520 mm/slub.c:1942 new_slab mm/slub.c:2002 [inline] ___slab_alloc+0x41e/0xcd0 mm/slub.c:3002 __slab_alloc mm/slub.c:3089 [inline] slab_alloc_node mm/slub.c:3180 [inline] slab_alloc mm/slub.c:3222 [inline] kmem_cache_alloc_trace+0x25c/0x310 mm/slub.c:3253 kmalloc include/linux/slab.h:600 [inline] __hw_addr_create net/core/dev_addr_lists.c:60 [inline] __hw_addr_add_ex+0x1db/0x610 net/core/dev_addr_lists.c:118 __hw_addr_add net/core/dev_addr_lists.c:135 [inline] dev_addr_init+0x13e/0x220 net/core/dev_addr_lists.c:558 alloc_netdev_mqs+0x26c/0xea0 net/core/dev.c:10593 ip6gre_init_net+0xaf/0x2e0 net/ipv6/ip6_gre.c:1589 ops_init+0x313/0x430 net/core/net_namespace.c:134 setup_net+0x4bb/0xc10 net/core/net_namespace.c:325 copy_net_ns+0x359/0x5b0 net/core/net_namespace.c:471 create_new_namespaces+0x4db/0x8e0 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x11e/0x180 kernel/nsproxy.c:226 ksys_unshare+0x57f/0xb30 kernel/fork.c:3135 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1371 [inline] free_pcp_prepare+0x812/0x900 mm/page_alloc.c:1421 free_unref_page_prepare mm/page_alloc.c:3343 [inline] free_unref_page+0x7d/0x390 mm/page_alloc.c:3438 relay_destroy_buf+0x119/0x3b0 kernel/relay.c:204 relay_remove_buf kernel/relay.c:224 [inline] kref_put include/linux/kref.h:65 [inline] relay_close_buf kernel/relay.c:433 [inline] relay_close+0x3d0/0x750 kernel/relay.c:769 blk_trace_free+0x3c/0x120 kernel/trace/blktrace.c:315 blk_trace_cleanup kernel/trace/blktrace.c:351 [inline] __blk_trace_remove+0xf3/0x160 kernel/trace/blktrace.c:365 blk_trace_ioctl+0x1fd/0x8d0 kernel/trace/blktrace.c:755 blkdev_common_ioctl+0xf62/0x2390 block/ioctl.c:534 blkdev_ioctl+0x2f2/0x760 block/ioctl.c:608 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Memory state around the buggy address: ffff88807a05a900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807a05a980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88807a05aa00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807a05aa80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807a05ab00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================