IPVS: ftp: loaded support on port[0] = 21 ================================================================== BUG: KASAN: slab-out-of-bounds in __read_once_size include/linux/compiler.h:188 [inline] BUG: KASAN: slab-out-of-bounds in list_empty include/linux/list.h:203 [inline] BUG: KASAN: slab-out-of-bounds in shrink_slab_memcg mm/vmscan.c:595 [inline] BUG: KASAN: slab-out-of-bounds in shrink_slab+0xa04/0xa60 mm/vmscan.c:671 Read of size 8 at addr ffff8801cec8a818 by task syz-executor5/23965 CPU: 1 PID: 23965 Comm: syz-executor5 Not tainted 4.18.0-rc4-next-20180713+ #7 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+0x242/0x30d mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 __read_once_size include/linux/compiler.h:188 [inline] list_empty include/linux/list.h:203 [inline] shrink_slab_memcg mm/vmscan.c:595 [inline] shrink_slab+0xa04/0xa60 mm/vmscan.c:671 IPVS: ftp: loaded support on port[0] = 21 shrink_node+0x429/0x16a0 mm/vmscan.c:2735 shrink_zones mm/vmscan.c:2964 [inline] do_try_to_free_pages+0x3e7/0x1290 mm/vmscan.c:3026 try_to_free_mem_cgroup_pages+0x49d/0xc90 mm/vmscan.c:3324 memory_high_write+0x283/0x310 mm/memcontrol.c:5611 cgroup_file_write+0x31f/0x840 kernel/cgroup/cgroup.c:3502 kernfs_fop_write+0x2ba/0x480 fs/kernfs/file.c:316 __vfs_write+0x117/0x9d0 fs/read_write.c:485 __kernel_write+0x10c/0x370 fs/read_write.c:506 write_pipe_buf+0x181/0x240 fs/splice.c:798 splice_from_pipe_feed fs/splice.c:503 [inline] __splice_from_pipe+0x38e/0x7c0 fs/splice.c:627 splice_from_pipe+0x1ea/0x340 fs/splice.c:662 default_file_splice_write+0x3c/0x90 fs/splice.c:810 do_splice_from fs/splice.c:852 [inline] direct_splice_actor+0x128/0x190 fs/splice.c:1019 splice_direct_to_actor+0x318/0x8f0 fs/splice.c:974 do_splice_direct+0x2d4/0x420 fs/splice.c:1062 do_sendfile+0x62a/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: 0033:0x455ab9 Code: 1d ba 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 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f88f3415c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f88f34166d4 RCX: 0000000000455ab9 RDX: 0000000020000040 RSI: 0000000000000014 RDI: 0000000000000014 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004c0d79 R14: 00000000004d1380 R15: 0000000000000000 Allocated by task 20308: 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 __do_kmalloc mm/slab.c:3718 [inline] __kmalloc+0x14e/0x760 mm/slab.c:3727 kmalloc include/linux/slab.h:518 [inline] kzalloc include/linux/slab.h:707 [inline] fib_create_info+0x9b1/0x45e0 net/ipv4/fib_semantics.c:1082 fib_table_insert+0x1c1/0x17a0 net/ipv4/fib_trie.c:1146 fib_magic.isra.22+0x66b/0x890 net/ipv4/fib_frontend.c:886 fib_add_ifaddr+0x382/0x500 net/ipv4/fib_frontend.c:921 fib_inetaddr_event+0x172/0x222 net/ipv4/fib_frontend.c:1220 notifier_call_chain+0x180/0x390 kernel/notifier.c:93 __blocking_notifier_call_chain kernel/notifier.c:317 [inline] blocking_notifier_call_chain+0x147/0x190 kernel/notifier.c:328 __inet_insert_ifa+0x858/0xba0 net/ipv4/devinet.c:519 inet_rtm_newaddr+0xe92/0x13b0 net/ipv4/devinet.c:910 rtnetlink_rcv_msg+0x46e/0xc30 net/core/rtnetlink.c:4665 netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2448 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:4683 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] netlink_unicast+0x5a0/0x760 net/netlink/af_netlink.c:1336 netlink_sendmsg+0xa18/0xfc0 net/netlink/af_netlink.c:1901 sock_sendmsg_nosec net/socket.c:623 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:633 ___sys_sendmsg+0x7fd/0x930 net/socket.c:2107 __sys_sendmsg+0x11d/0x290 net/socket.c:2145 __do_sys_sendmsg net/socket.c:2154 [inline] __se_sys_sendmsg net/socket.c:2152 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2152 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 18784: 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 iter_file_splice_write+0x78d/0x1010 fs/splice.c:777 do_splice_from fs/splice.c:852 [inline] direct_splice_actor+0x128/0x190 fs/splice.c:1019 splice_direct_to_actor+0x318/0x8f0 fs/splice.c:974 do_splice_direct+0x2d4/0x420 fs/splice.c:1062 do_sendfile+0x62a/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 The buggy address belongs to the object at ffff8801cec8a700 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 24 bytes to the right of 256-byte region [ffff8801cec8a700, ffff8801cec8a800) The buggy address belongs to the page: page:ffffea00073b2280 count:1 mapcount:0 mapping:ffff8801da8007c0 index:0xffff8801cec8aac0 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea0006d57a88 ffffea00070cf548 ffff8801da8007c0 raw: ffff8801cec8aac0 ffff8801cec8a0c0 0000000100000007 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801cec8a700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801cec8a780: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc >ffff8801cec8a800: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff8801cec8a880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8801cec8a900: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ================================================================== BUG: unable to handle kernel NULL pointer dereference at 0000000000000000