================================================================== BUG: KASAN: slab-out-of-bounds in lco_csum include/linux/skbuff.h:4703 [inline] BUG: KASAN: slab-out-of-bounds in udp6_set_csum+0x52d/0x560 net/ipv6/ip6_checksum.c:127 Read of size 2 at addr ffff88807da9dc02 by task syz-executor.0/10193 CPU: 0 PID: 10193 Comm: syz-executor.0 Not tainted 5.16.0-rc1-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 lco_csum include/linux/skbuff.h:4703 [inline] udp6_set_csum+0x52d/0x560 net/ipv6/ip6_checksum.c:127 udp_tunnel6_xmit_skb+0x2a6/0xc90 net/ipv6/ip6_udp_tunnel.c:97 geneve6_xmit_skb drivers/net/geneve.c:1050 [inline] geneve_xmit+0x91f/0x3540 drivers/net/geneve.c:1079 __netdev_start_xmit include/linux/netdevice.h:4987 [inline] netdev_start_xmit include/linux/netdevice.h:5001 [inline] xmit_one net/core/dev.c:3590 [inline] dev_hard_start_xmit+0x1eb/0x920 net/core/dev.c:3606 sch_direct_xmit+0x19f/0xbc0 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+0x2091/0x3630 net/core/dev.c:4194 packet_snd net/packet/af_packet.c:3052 [inline] packet_sendmsg+0x220b/0x52a0 net/packet/af_packet.c:3079 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 __sys_sendto+0x21c/0x320 net/socket.c:2036 __do_sys_sendto net/socket.c:2048 [inline] __se_sys_sendto net/socket.c:2044 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2044 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: 0033:0x7f2458c57ae9 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:00007f24561cd188 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f2458d6af60 RCX: 00007f2458c57ae9 RDX: 0000000000003287 RSI: 0000000020000080 RDI: 0000000000000004 RBP: 00007f2458cb1f6d R08: 0000000000000000 R09: 00000000000002ff R10: 0000000004000002 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdb77654ef R14: 00007f24561cd300 R15: 0000000000022000 Allocated by task 6530: 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] rxrpc_alloc_local net/rxrpc/local_object.c:80 [inline] rxrpc_lookup_local+0x40f/0x1050 net/rxrpc/local_object.c:222 rxrpc_bind+0x35a/0x5c0 net/rxrpc/af_rxrpc.c:149 afs_open_socket+0x1b0/0x360 fs/afs/rxrpc.c:64 afs_net_init+0xa75/0xec0 fs/afs/main.c:126 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 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226 ksys_unshare+0x445/0x920 kernel/fork.c:3075 __do_sys_unshare kernel/fork.c:3146 [inline] __se_sys_unshare kernel/fork.c:3144 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3144 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 Last potentially related work creation: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 __kasan_record_aux_stack+0xf5/0x120 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:2985 [inline] call_rcu+0xb1/0x740 kernel/rcu/tree.c:3065 rxrpc_put_local+0xa1/0xc0 net/rxrpc/local_object.c:322 rxrpc_release_sock net/rxrpc/af_rxrpc.c:891 [inline] rxrpc_release+0x2c1/0x5a0 net/rxrpc/af_rxrpc.c:917 __sock_release net/socket.c:649 [inline] sock_release+0x87/0x1b0 net/socket.c:677 afs_close_socket+0x1ca/0x330 fs/afs/rxrpc.c:125 afs_net_exit+0x175/0x320 fs/afs/main.c:158 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:168 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:593 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298 worker_thread+0x658/0x11f0 kernel/workqueue.c:2445 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Second to last potentially related work creation: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 __kasan_record_aux_stack+0xf5/0x120 mm/kasan/generic.c:348 insert_work+0x48/0x370 kernel/workqueue.c:1354 __queue_work+0x5ca/0xee0 kernel/workqueue.c:1520 queue_work_on+0xee/0x110 kernel/workqueue.c:1547 queue_work include/linux/workqueue.h:502 [inline] rxrpc_queue_local+0xb3/0x130 net/rxrpc/local_object.c:300 rxrpc_unuse_local+0x59/0x60 net/rxrpc/local_object.c:352 rxrpc_release_sock net/rxrpc/af_rxrpc.c:890 [inline] rxrpc_release+0x29a/0x5a0 net/rxrpc/af_rxrpc.c:917 __sock_release net/socket.c:649 [inline] sock_release+0x87/0x1b0 net/socket.c:677 afs_close_socket+0x1ca/0x330 fs/afs/rxrpc.c:125 afs_net_exit+0x175/0x320 fs/afs/main.c:158 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:168 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:593 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298 worker_thread+0x658/0x11f0 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 ffff88807da9d800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 2 bytes to the right of 1024-byte region [ffff88807da9d800, ffff88807da9dc00) The buggy address belongs to the page: page:ffffea0001f6a600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7da98 head:ffffea0001f6a600 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888010c41dc0 raw: 0000000000000000 0000000080100010 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 6505, ts 74968664970, free_ts 74280468284 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:2191 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] __kmalloc_node_track_caller+0x2cb/0x360 mm/slub.c:4956 kmalloc_reserve net/core/skbuff.c:354 [inline] __alloc_skb+0xde/0x340 net/core/skbuff.c:426 alloc_skb include/linux/skbuff.h:1126 [inline] __tcp_send_ack.part.0+0x67/0x760 net/ipv4/tcp_output.c:3930 __tcp_send_ack net/ipv4/tcp_output.c:3962 [inline] tcp_send_ack+0x7d/0xa0 net/ipv4/tcp_output.c:3962 tcp_cleanup_rbuf+0x464/0x5a0 net/ipv4/tcp.c:1580 tcp_recvmsg_locked+0x7a2/0x20d0 net/ipv4/tcp.c:2501 tcp_recvmsg+0x12b/0x550 net/ipv4/tcp.c:2531 inet_recvmsg+0x11b/0x5e0 net/ipv4/af_inet.c:850 sock_recvmsg_nosec net/socket.c:944 [inline] sock_recvmsg net/socket.c:962 [inline] sock_recvmsg net/socket.c:958 [inline] sock_read_iter+0x33c/0x470 net/socket.c:1035 call_read_iter include/linux/fs.h:2156 [inline] new_sync_read+0x5ba/0x6e0 fs/read_write.c:400 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 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] kmem_cache_alloc_node+0x255/0x3f0 mm/slub.c:3270 __alloc_skb+0x215/0x340 net/core/skbuff.c:414 alloc_skb_fclone include/linux/skbuff.h:1176 [inline] tcp_stream_alloc_skb+0x66/0x910 net/ipv4/tcp.c:861 tcp_sendmsg_locked+0xaba/0x3040 net/ipv4/tcp.c:1281 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1440 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 sock_write_iter+0x289/0x3c0 net/socket.c:1057 call_write_iter include/linux/fs.h:2162 [inline] new_sync_write+0x429/0x660 fs/read_write.c:503 vfs_write+0x7cd/0xae0 fs/read_write.c:590 ksys_write+0x1ee/0x250 fs/read_write.c:643 Memory state around the buggy address: ffff88807da9db00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807da9db80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88807da9dc00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88807da9dc80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807da9dd00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================