binder: 9548:9568 unknown command 0 binder: 9548:9568 ioctl c0306201 20dd8000 returned -22 binder: 9548:9574 got reply transaction with no transaction stack binder: 9548:9574 transaction failed 29201/-71, size 0-8 line 2760 ================================================================== BUG: KASAN: slab-out-of-bounds in __tcp_hdrlen include/linux/tcp.h:35 [inline] BUG: KASAN: slab-out-of-bounds in tcp_hdrlen include/linux/tcp.h:40 [inline] BUG: KASAN: slab-out-of-bounds in qdisc_pkt_len_init net/core/dev.c:3159 [inline] BUG: KASAN: slab-out-of-bounds in __dev_queue_xmit+0x22b6/0x2300 net/core/dev.c:3465 Read of size 2 at addr ffff8801d17e1fc0 by task syz-executor7/9571 CPU: 1 PID: 9571 Comm: syz-executor7 Not tainted 4.15.0-rc6-next-20180102+ #86 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x137/0x198 lib/dump_stack.c:53 print_address_description+0x73/0x250 mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:355 [inline] kasan_report+0x23b/0x360 mm/kasan/report.c:413 __asan_report_load2_noabort+0x14/0x20 mm/kasan/report.c:432 __tcp_hdrlen include/linux/tcp.h:35 [inline] tcp_hdrlen include/linux/tcp.h:40 [inline] qdisc_pkt_len_init net/core/dev.c:3159 [inline] __dev_queue_xmit+0x22b6/0x2300 net/core/dev.c:3465 dev_queue_xmit+0x17/0x20 net/core/dev.c:3554 packet_snd net/packet/af_packet.c:2944 [inline] packet_sendmsg+0x31d5/0x5720 net/packet/af_packet.c:2969 sock_sendmsg_nosec net/socket.c:628 [inline] sock_sendmsg+0xca/0x110 net/socket.c:638 sock_write_iter+0x21d/0x3a0 net/socket.c:907 call_write_iter include/linux/fs.h:1775 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x550/0x740 fs/read_write.c:482 vfs_write+0x189/0x510 fs/read_write.c:544 SYSC_write fs/read_write.c:589 [inline] SyS_write+0xd4/0x1a0 fs/read_write.c:581 entry_SYSCALL_64_fastpath+0x23/0x9a RIP: 0033:0x452ac9 RSP: 002b:00007f9d4f323c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452ac9 RDX: 00000000000000b6 RSI: 0000000020dbef4a RDI: 0000000000000015 RBP: 000000000000034b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f2fa8 R13: 00000000ffffffff R14: 00007f9d4f3246d4 R15: 0000000000000000 Allocated by task 7449: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551 __do_kmalloc_node mm/slab.c:3669 [inline] __kmalloc_node_track_caller+0x47/0x70 mm/slab.c:3683 __kmalloc_reserve.isra.39+0x41/0xe0 net/core/skbuff.c:137 __alloc_skb+0xf0/0x5a0 net/core/skbuff.c:205 alloc_skb include/linux/skbuff.h:983 [inline] nlmsg_new include/net/netlink.h:511 [inline] inet_netconf_notify_devconf+0xb4/0x1d0 net/ipv4/devinet.c:1890 __devinet_sysctl_register+0x1e9/0x2b0 net/ipv4/devinet.c:2320 devinet_sysctl_register+0x135/0x1e0 net/ipv4/devinet.c:2354 inetdev_init+0x20c/0x400 net/ipv4/devinet.c:263 inetdev_event+0xdac/0x1120 net/ipv4/devinet.c:1461 notifier_call_chain+0x90/0x190 kernel/notifier.c:93 __raw_notifier_call_chain kernel/notifier.c:394 [inline] raw_notifier_call_chain+0x2d/0x40 kernel/notifier.c:401 call_netdevice_notifiers_info+0x32/0x70 net/core/dev.c:1696 call_netdevice_notifiers net/core/dev.c:1714 [inline] register_netdevice+0xc86/0xf30 net/core/dev.c:7804 tun_set_iff drivers/net/tun.c:2390 [inline] __tun_chr_ioctl+0x1843/0x3710 drivers/net/tun.c:2614 tun_chr_ioctl+0x2a/0x40 drivers/net/tun.c:2867 vfs_ioctl fs/ioctl.c:46 [inline] do_vfs_ioctl+0x190/0xfe0 fs/ioctl.c:686 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 entry_SYSCALL_64_fastpath+0x23/0x9a Freed by task 7449: save_stack+0x43/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3485 [inline] kfree+0xd6/0x260 mm/slab.c:3800 skb_free_head+0x74/0xb0 net/core/skbuff.c:550 skb_release_data+0x442/0x5e0 net/core/skbuff.c:570 skb_release_all+0x4a/0x60 net/core/skbuff.c:627 __kfree_skb net/core/skbuff.c:641 [inline] consume_skb+0x9e/0x2e0 net/core/skbuff.c:701 netlink_broadcast_filtered+0x296/0x9e0 net/netlink/af_netlink.c:1510 netlink_broadcast net/netlink/af_netlink.c:1532 [inline] nlmsg_multicast include/net/netlink.h:591 [inline] nlmsg_notify+0x91/0x150 net/netlink/af_netlink.c:2484 rtnl_notify+0xbb/0xe0 net/core/rtnetlink.c:713 inet_netconf_notify_devconf+0x17e/0x1d0 net/ipv4/devinet.c:1902 __devinet_sysctl_register+0x1e9/0x2b0 net/ipv4/devinet.c:2320 devinet_sysctl_register+0x135/0x1e0 net/ipv4/devinet.c:2354 inetdev_init+0x20c/0x400 net/ipv4/devinet.c:263 inetdev_event+0xdac/0x1120 net/ipv4/devinet.c:1461 notifier_call_chain+0x90/0x190 kernel/notifier.c:93 __raw_notifier_call_chain kernel/notifier.c:394 [inline] raw_notifier_call_chain+0x2d/0x40 kernel/notifier.c:401 call_netdevice_notifiers_info+0x32/0x70 net/core/dev.c:1696 call_netdevice_notifiers net/core/dev.c:1714 [inline] register_netdevice+0xc86/0xf30 net/core/dev.c:7804 tun_set_iff drivers/net/tun.c:2390 [inline] __tun_chr_ioctl+0x1843/0x3710 drivers/net/tun.c:2614 tun_chr_ioctl+0x2a/0x40 drivers/net/tun.c:2867 vfs_ioctl fs/ioctl.c:46 [inline] do_vfs_ioctl+0x190/0xfe0 fs/ioctl.c:686 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 entry_SYSCALL_64_fastpath+0x23/0x9a The buggy address belongs to the object at ffff8801d17e1d40 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 128 bytes to the right of 512-byte region [ffff8801d17e1d40, ffff8801d17e1f40) The buggy address belongs to the page: page:ffffea000745f840 count:1 mapcount:0 mapping:ffff8801d17e10c0 index:0x0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffff8801d17e10c0 0000000000000000 0000000100000006 raw: ffffea0007457e60 ffffea000745c460 ffff8801db000940 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d17e1e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801d17e1f00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff8801d17e1f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8801d17e2000: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff8801d17e2080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================