================================================================== BUG: KASAN: slab-out-of-bounds in ether_addr_equal include/linux/etherdevice.h:322 [inline] BUG: KASAN: slab-out-of-bounds in ether_addr_equal_unaligned include/linux/etherdevice.h:376 [inline] BUG: KASAN: slab-out-of-bounds in batadv_compare_eth net/batman-adv/main.h:283 [inline] BUG: KASAN: slab-out-of-bounds in batadv_interface_tx+0x1638/0x1880 net/batman-adv/soft-interface.c:265 Read of size 4 at addr ffff88806bf9e2bf by task syz-executor5/31813 CPU: 0 PID: 31813 Comm: syz-executor5 Not tainted 4.20.0+ #2 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+0x1db/0x2d0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report mm/kasan/report.c:412 [inline] kasan_report.cold+0x8c/0x2ba mm/kasan/report.c:396 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432 ether_addr_equal include/linux/etherdevice.h:322 [inline] ether_addr_equal_unaligned include/linux/etherdevice.h:376 [inline] batadv_compare_eth net/batman-adv/main.h:283 [inline] batadv_interface_tx+0x1638/0x1880 net/batman-adv/soft-interface.c:265 __netdev_start_xmit include/linux/netdevice.h:4382 [inline] netdev_start_xmit include/linux/netdevice.h:4391 [inline] dev_direct_xmit+0x368/0x670 net/core/dev.c:3930 packet_direct_xmit+0xfb/0x170 net/packet/af_packet.c:246 packet_snd net/packet/af_packet.c:2932 [inline] packet_sendmsg+0x2753/0x6830 net/packet/af_packet.c:2957 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:631 __sys_sendto+0x387/0x5f0 net/socket.c:1788 __do_sys_sendto net/socket.c:1800 [inline] __se_sys_sendto net/socket.c:1796 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1796 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457ec9 Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fcd8c6f9c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000457ec9 RDX: 000000000000004c RSI: 0000000020000180 RDI: 0000000000000005 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fcd8c6fa6d4 R13: 00000000004c5284 R14: 00000000004d8ba8 R15: 00000000ffffffff Allocated by task 12343: save_stack+0x45/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc mm/kasan/kasan.c:553 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:531 __do_kmalloc_node mm/slab.c:3684 [inline] __kmalloc_node_track_caller+0x51/0x80 mm/slab.c:3698 __kmalloc_reserve.isra.0+0x40/0xe0 net/core/skbuff.c:140 __alloc_skb+0x12d/0x730 net/core/skbuff.c:208 alloc_skb include/linux/skbuff.h:1011 [inline] nlmsg_new include/net/netlink.h:654 [inline] inet_netconf_notify_devconf+0xea/0x260 net/ipv4/devinet.c:2039 __devinet_sysctl_unregister.isra.0+0x85/0xb0 net/ipv4/devinet.c:2511 devinet_sysctl_unregister+0x92/0xf0 net/ipv4/devinet.c:2535 inetdev_destroy net/ipv4/devinet.c:321 [inline] inetdev_event+0xa2c/0x1330 net/ipv4/devinet.c:1548 notifier_call_chain+0x179/0x380 kernel/notifier.c:93 __raw_notifier_call_chain kernel/notifier.c:394 [inline] raw_notifier_call_chain+0x2e/0x40 kernel/notifier.c:401 call_netdevice_notifiers_info+0x3f/0x90 net/core/dev.c:1739 call_netdevice_notifiers_extack net/core/dev.c:1751 [inline] call_netdevice_notifiers net/core/dev.c:1765 [inline] rollback_registered_many+0xc50/0x1370 net/core/dev.c:8102 unregister_netdevice_many.part.0+0x8e/0x470 net/core/dev.c:9207 unregister_netdevice_many+0xba/0x120 net/core/dev.c:9206 ip_tunnel_delete_nets+0x4da/0x6d0 net/ipv4/ip_tunnel.c:1082 ipgre_tap_exit_batch_net+0x23/0x30 net/ipv4/ip_gre.c:1640 ops_exit_list.isra.0+0x105/0x160 net/core/net_namespace.c:156 cleanup_net+0x51d/0xb10 net/core/net_namespace.c:551 process_one_work+0xd0c/0x1ce0 kernel/workqueue.c:2153 worker_thread+0x143/0x14a0 kernel/workqueue.c:2296 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Freed by task 12343: save_stack+0x45/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xcf/0x230 mm/slab.c:3817 skb_free_head+0x93/0xb0 net/core/skbuff.c:553 skb_release_data+0x6ea/0x970 net/core/skbuff.c:573 skb_release_all+0x4d/0x60 net/core/skbuff.c:627 __kfree_skb net/core/skbuff.c:641 [inline] consume_skb net/core/skbuff.c:701 [inline] consume_skb+0x18c/0x550 net/core/skbuff.c:695 netlink_broadcast_filtered+0x6e7/0x16f0 net/netlink/af_netlink.c:1512 netlink_broadcast net/netlink/af_netlink.c:1534 [inline] nlmsg_multicast include/net/netlink.h:734 [inline] nlmsg_notify+0x93/0x1c0 net/netlink/af_netlink.c:2520 rtnl_notify+0xc5/0xf0 net/core/rtnetlink.c:742 inet_netconf_notify_devconf+0x148/0x260 net/ipv4/devinet.c:2051 __devinet_sysctl_unregister.isra.0+0x85/0xb0 net/ipv4/devinet.c:2511 devinet_sysctl_unregister+0x92/0xf0 net/ipv4/devinet.c:2535 inetdev_destroy net/ipv4/devinet.c:321 [inline] inetdev_event+0xa2c/0x1330 net/ipv4/devinet.c:1548 notifier_call_chain+0x179/0x380 kernel/notifier.c:93 __raw_notifier_call_chain kernel/notifier.c:394 [inline] raw_notifier_call_chain+0x2e/0x40 kernel/notifier.c:401 call_netdevice_notifiers_info+0x3f/0x90 net/core/dev.c:1739 call_netdevice_notifiers_extack net/core/dev.c:1751 [inline] call_netdevice_notifiers net/core/dev.c:1765 [inline] rollback_registered_many+0xc50/0x1370 net/core/dev.c:8102 unregister_netdevice_many.part.0+0x8e/0x470 net/core/dev.c:9207 unregister_netdevice_many+0xba/0x120 net/core/dev.c:9206 ip_tunnel_delete_nets+0x4da/0x6d0 net/ipv4/ip_tunnel.c:1082 ipgre_tap_exit_batch_net+0x23/0x30 net/ipv4/ip_gre.c:1640 ops_exit_list.isra.0+0x105/0x160 net/core/net_namespace.c:156 cleanup_net+0x51d/0xb10 net/core/net_namespace.c:551 process_one_work+0xd0c/0x1ce0 kernel/workqueue.c:2153 worker_thread+0x143/0x14a0 kernel/workqueue.c:2296 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff88806bf9e040 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 127 bytes to the right of 512-byte region [ffff88806bf9e040, ffff88806bf9e240) The buggy address belongs to the page: page:ffffea0001afe780 count:1 mapcount:0 mapping:ffff88812c3f0940 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea0001acc848 ffffea00021f7f88 ffff88812c3f0940 raw: 0000000000000000 ffff88806bf9e040 0000000100000006 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88806bf9e180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88806bf9e200: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff88806bf9e280: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ^ ffff88806bf9e300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88806bf9e380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================