(unnamed net_device) (uninitialized): Unable to set up delay as MII monitoring is disabled ================================================================== batman_adv: Cannot find parent device BUG: KASAN: use-after-free in ex_handler_refcount+0x162/0x1a0 arch/x86/mm/extable.c:49 Write of size 4 at addr ffff8880a40ea5bc by task syz-executor.3/12157 CPU: 0 PID: 12157 Comm: syz-executor.3 Not tainted 4.14.170-syzkaller #0 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+0x142/0x197 lib/dump_stack.c:58 print_address_description.cold+0x7c/0x1dc mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report mm/kasan/report.c:409 [inline] kasan_report.cold+0xa9/0x2af mm/kasan/report.c:393 __asan_report_store4_noabort+0x17/0x20 mm/kasan/report.c:434 ex_handler_refcount+0x162/0x1a0 arch/x86/mm/extable.c:49 fixup_exception+0x8b/0xb9 arch/x86/mm/extable.c:197 do_trap_no_signal arch/x86/kernel/traps.c:208 [inline] do_trap+0x65/0x250 arch/x86/kernel/traps.c:257 do_error_trap+0x153/0x310 arch/x86/kernel/traps.c:301 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:963 RIP: 0010:inat_get_avx_attribute+0x3c9d/0x7ad5 RSP: 0018:ffff8880482ef6e0 EFLAGS: 00010296 RAX: 0000000000040000 RBX: ffff888048962280 RCX: ffff8880a40ea5bc RDX: 0000000000001461 RSI: ffffffff85180e5e RDI: ffff8880a40ea380 RBP: ffff8880482ef6e8 R08: ffff88803fa2a600 R09: ffff88803fa2aec8 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a40ea380 R13: ffffffff85e7e0d0 R14: 0000000000000000 R15: 0000000000000000 sock_put include/net/sock.h:1658 [inline] pppol2tp_session_sock_put+0x66/0x80 net/l2tp/l2tp_ppp.c:271 l2tp_nl_cmd_session_delete+0xc4/0x1c0 net/l2tp/l2tp_netlink.c:684 genl_family_rcv_msg+0x614/0xc30 net/netlink/genetlink.c:600 genl_rcv_msg+0xb4/0x150 net/netlink/genetlink.c:625 netlink_rcv_skb+0x14f/0x3c0 net/netlink/af_netlink.c:2432 genl_rcv+0x29/0x40 net/netlink/genetlink.c:636 netlink_unicast_kernel net/netlink/af_netlink.c:1286 [inline] netlink_unicast+0x44d/0x650 net/netlink/af_netlink.c:1312 netlink_sendmsg+0x7c4/0xc60 net/netlink/af_netlink.c:1877 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xce/0x110 net/socket.c:656 ___sys_sendmsg+0x70a/0x840 net/socket.c:2062 __sys_sendmsg+0xb9/0x140 net/socket.c:2096 SYSC_sendmsg net/socket.c:2107 [inline] SyS_sendmsg+0x2d/0x50 net/socket.c:2103 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45b399 RSP: 002b:00007f5683da3c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f5683da46d4 RCX: 000000000045b399 RDX: 0000000000000000 RSI: 0000000020000500 RDI: 0000000000000009 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000092a R14: 00000000004ca87e R15: 000000000075bf2c Allocated by task 7496: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x45/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:529 __do_kmalloc_node mm/slab.c:3682 [inline] __kmalloc_node+0x51/0x80 mm/slab.c:3689 kmalloc_node include/linux/slab.h:530 [inline] kvmalloc_node+0x4e/0xe0 mm/util.c:397 kvmalloc include/linux/mm.h:531 [inline] kvmalloc_array include/linux/mm.h:547 [inline] alloc_fdtable+0xcf/0x280 fs/file.c:120 dup_fd+0x693/0xa40 fs/file.c:315 copy_files kernel/fork.c:1304 [inline] copy_process.part.0+0x1b5a/0x6a70 kernel/fork.c:1759 copy_process kernel/fork.c:1586 [inline] _do_fork+0x19e/0xce0 kernel/fork.c:2070 SYSC_clone kernel/fork.c:2180 [inline] SyS_clone+0x37/0x50 kernel/fork.c:2174 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 Freed by task 11960: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x45/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xcc/0x270 mm/slab.c:3815 kvfree+0x4d/0x60 mm/util.c:416 __free_fdtable+0x34/0x80 fs/file.c:36 put_files_struct fs/file.c:425 [inline] put_files_struct+0x233/0x2d0 fs/file.c:418 exit_files+0x83/0xb0 fs/file.c:450 do_exit+0x9ec/0x2cd0 kernel/exit.c:853 do_group_exit+0x111/0x330 kernel/exit.c:955 get_signal+0x381/0x1cd0 kernel/signal.c:2418 do_signal+0x86/0x19a0 arch/x86/kernel/signal.c:814 exit_to_usermode_loop+0x15c/0x220 arch/x86/entry/common.c:160 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4bc/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x42/0xb7 The buggy address belongs to the object at ffff8880a40ea380 which belongs to the cache kmalloc-2048 of size 2048 The buggy address is located 572 bytes inside of 2048-byte region [ffff8880a40ea380, ffff8880a40eab80) The buggy address belongs to the page: page:ffffea0002903a80 count:1 mapcount:0 mapping:ffff8880a40ea380 index:0x0 compound_mapcount: 0 flags: 0xfffe0000008100(slab|head) raw: 00fffe0000008100 ffff8880a40ea380 0000000000000000 0000000100000003 raw: ffffea00029f9ba0 ffffea000229aa20 ffff8880aa800c40 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a40ea480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a40ea500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880a40ea580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a40ea600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a40ea680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================