CPU: 1 PID: 31726 Comm: syz-executor1 Not tainted 4.18.0-rc7+ #171 ================================================================== 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+0x1c9/0x2b4 lib/dump_stack.c:113 BUG: KASAN: use-after-free in rtnetlink_put_metrics+0x621/0x690 net/core/rtnetlink.c:754 Read of size 4 at addr ffff8801cf73da00 by task syz-executor2/31660 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold.4+0xa/0x1a lib/fault-inject.c:149 should_fail_alloc_page mm/page_alloc.c:3057 [inline] prepare_alloc_pages mm/page_alloc.c:4325 [inline] __alloc_pages_nodemask+0x36e/0xdb0 mm/page_alloc.c:4363 alloc_pages_current+0x10c/0x210 mm/mempolicy.c:2093 alloc_pages include/linux/gfp.h:492 [inline] push_pipe+0x400/0x7a0 lib/iov_iter.c:515 __pipe_get_pages lib/iov_iter.c:1152 [inline] pipe_get_pages_alloc lib/iov_iter.c:1256 [inline] iov_iter_get_pages_alloc+0x866/0x1530 lib/iov_iter.c:1274 default_file_splice_read+0x1da/0xb10 fs/splice.c:391 do_splice_to+0x12e/0x190 fs/splice.c:881 splice_direct_to_actor+0x270/0x8f0 fs/splice.c:953 do_splice_direct+0x2d4/0x420 fs/splice.c:1062 do_sendfile+0x623/0xe20 fs/read_write.c:1440 __do_sys_sendfile64 fs/read_write.c:1495 [inline] __se_sys_sendfile64 fs/read_write.c:1487 [inline] __x64_sys_sendfile64+0x15d/0x250 fs/read_write.c:1487 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x456a09 Code: fd b4 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 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fb92c677c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007fb92c6786d4 RCX: 0000000000456a09 RDX: 0000000020000040 RSI: 0000000000000016 RDI: 0000000000000015 RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000008001 R11: 0000000000000246 R12: 0000000000000017 R13: 00000000004d2c80 R14: 00000000004c79f7 R15: 0000000000000004 CPU: 0 PID: 31660 Comm: syz-executor2 Not tainted 4.18.0-rc7+ #171 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+0x1c9/0x2b4 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432 rtnetlink_put_metrics+0x621/0x690 net/core/rtnetlink.c:754 rt6_fill_node+0x7d9/0x1540 net/ipv6/route.c:4753 inet6_rt_notify+0x161/0x2c0 net/ipv6/route.c:4985 fib6_del_route net/ipv6/ip6_fib.c:1788 [inline] fib6_del+0xf4d/0x1310 net/ipv6/ip6_fib.c:1815 fib6_clean_node+0x3ee/0x5e0 net/ipv6/ip6_fib.c:1976 fib6_walk_continue+0x4b1/0x8e0 net/ipv6/ip6_fib.c:1899 fib6_walk+0x95/0xf0 net/ipv6/ip6_fib.c:1947 fib6_clean_tree+0x1ea/0x360 net/ipv6/ip6_fib.c:2024 __fib6_clean_all+0x21c/0x420 net/ipv6/ip6_fib.c:2040 fib6_clean_all net/ipv6/ip6_fib.c:2051 [inline] fib6_run_gc+0x182/0x3d0 net/ipv6/ip6_fib.c:2107 ndisc_netdev_event+0x4ab/0x580 net/ipv6/ndisc.c:1790 notifier_call_chain+0x180/0x390 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+0x3f/0x90 net/core/dev.c:1735 call_netdevice_notifiers net/core/dev.c:1753 [inline] dev_close_many+0x447/0x8d0 net/core/dev.c:1505 rollback_registered_many+0x52b/0xef0 net/core/dev.c:7452 rollback_registered+0x1e9/0x420 net/core/dev.c:7517 unregister_netdevice_queue+0x32f/0x660 net/core/dev.c:8561 unregister_netdevice include/linux/netdevice.h:2548 [inline] __tun_detach+0x11d1/0x15e0 drivers/net/tun.c:727 tun_detach drivers/net/tun.c:744 [inline] tun_chr_close+0xe3/0x180 drivers/net/tun.c:3271 __fput+0x355/0x8b0 fs/file_table.c:209 ____fput+0x15/0x20 fs/file_table.c:243 task_work_run+0x1ec/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:192 [inline] exit_to_usermode_loop+0x313/0x370 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4105c1 Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 34 19 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:0000000000a3feb0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000014 RCX: 00000000004105c1 RDX: 0000000000000000 RSI: 0000000000730bf8 RDI: 0000000000000013 RBP: 0000000000000010 R08: 0000000000000000 R09: ffffffffffffffff R10: 00000000009300a0 R11: 0000000000000293 R12: 0000000000000000 R13: 000000000005ba04 R14: 0000000000000296 R15: badc0ffeebadface Allocated by task 24163: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 kmem_cache_alloc_trace+0x152/0x780 mm/slab.c:3620 kmalloc include/linux/slab.h:513 [inline] kzalloc include/linux/slab.h:707 [inline] fib6_metric_set+0x163/0x2c0 net/ipv6/ip6_fib.c:645 fib6_add_rt2node+0xe36/0x27f0 net/ipv6/ip6_fib.c:1000 fib6_add+0xaae/0x14d0 net/ipv6/ip6_fib.c:1308 __ip6_ins_rt+0x54/0x80 net/ipv6/route.c:1163 ip6_route_add+0x6d/0xc0 net/ipv6/route.c:3171 addrconf_prefix_route.isra.48+0x51d/0x720 net/ipv6/addrconf.c:2347 inet6_addr_modify net/ipv6/addrconf.c:4627 [inline] inet6_rtm_newaddr+0x112e/0x1b50 net/ipv6/addrconf.c:4743 rtnetlink_rcv_msg+0x46e/0xc30 net/core/rtnetlink.c:4665 netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2453 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:4683 netlink_unicast_kernel net/netlink/af_netlink.c:1315 [inline] netlink_unicast+0x5a0/0x760 net/netlink/af_netlink.c:1341 netlink_sendmsg+0xa18/0xfd0 net/netlink/af_netlink.c:1906 sock_sendmsg_nosec net/socket.c:642 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:652 ___sys_sendmsg+0x7fd/0x930 net/socket.c:2126 __sys_sendmsg+0x11d/0x290 net/socket.c:2164 __do_sys_sendmsg net/socket.c:2173 [inline] __se_sys_sendmsg net/socket.c:2171 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2171 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 31660: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x260 mm/slab.c:3813 fib6_metrics_release+0x77/0x90 net/ipv6/ip6_fib.c:179 fib6_drop_pcpu_from net/ipv6/ip6_fib.c:899 [inline] fib6_purge_rt+0x5ec/0x7f0 net/ipv6/ip6_fib.c:934 fib6_del_route net/ipv6/ip6_fib.c:1784 [inline] fib6_del+0xc11/0x1310 net/ipv6/ip6_fib.c:1815 fib6_clean_node+0x3ee/0x5e0 net/ipv6/ip6_fib.c:1976 fib6_walk_continue+0x4b1/0x8e0 net/ipv6/ip6_fib.c:1899 fib6_walk+0x95/0xf0 net/ipv6/ip6_fib.c:1947 fib6_clean_tree+0x1ea/0x360 net/ipv6/ip6_fib.c:2024 __fib6_clean_all+0x21c/0x420 net/ipv6/ip6_fib.c:2040 fib6_clean_all net/ipv6/ip6_fib.c:2051 [inline] fib6_run_gc+0x182/0x3d0 net/ipv6/ip6_fib.c:2107 ndisc_netdev_event+0x4ab/0x580 net/ipv6/ndisc.c:1790 notifier_call_chain+0x180/0x390 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+0x3f/0x90 net/core/dev.c:1735 call_netdevice_notifiers net/core/dev.c:1753 [inline] dev_close_many+0x447/0x8d0 net/core/dev.c:1505 rollback_registered_many+0x52b/0xef0 net/core/dev.c:7452 rollback_registered+0x1e9/0x420 net/core/dev.c:7517 unregister_netdevice_queue+0x32f/0x660 net/core/dev.c:8561 unregister_netdevice include/linux/netdevice.h:2548 [inline] __tun_detach+0x11d1/0x15e0 drivers/net/tun.c:727 tun_detach drivers/net/tun.c:744 [inline] tun_chr_close+0xe3/0x180 drivers/net/tun.c:3271 __fput+0x355/0x8b0 fs/file_table.c:209 ____fput+0x15/0x20 fs/file_table.c:243 task_work_run+0x1ec/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:192 [inline] exit_to_usermode_loop+0x313/0x370 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801cf73da00 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 0 bytes inside of 96-byte region [ffff8801cf73da00, ffff8801cf73da60) The buggy address belongs to the page: page:ffffea00073dcf40 count:1 mapcount:0 mapping:ffff8801dac004c0 index:0xffff8801cf73d500 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea0007206148 ffffea0006c837c8 ffff8801dac004c0 raw: ffff8801cf73d500 ffff8801cf73d000 0000000100000016 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801cf73d900: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff8801cf73d980: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff8801cf73da00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff8801cf73da80: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff8801cf73db00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ==================================================================