rpcbind: RPC call returned error 22 rpcbind: RPC call returned error 22 rpcbind: RPC call returned error 22 rpcbind: RPC call returned error 22 ================================================================== BUG: KASAN: use-after-free in strlen+0x83/0xa0 lib/string.c:482 Read of size 1 at addr ffff8801d6f0a1c0 by task syz-executor7/5079 CPU: 1 PID: 5079 Comm: syz-executor7 Not tainted 4.17.0-rc2+ #16 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+0x1b9/0x294 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_load1_noabort+0x14/0x20 mm/kasan/report.c:430 strlen+0x83/0xa0 lib/string.c:482 trace_event_get_offsets_rpc_stats_latency include/trace/events/sunrpc.h:215 [inline] perf_trace_rpc_stats_latency+0x318/0x10d0 include/trace/events/sunrpc.h:215 trace_rpc_stats_latency include/trace/events/sunrpc.h:215 [inline] rpc_count_iostats_metrics+0x594/0x8a0 net/sunrpc/stats.c:182 rpc_count_iostats+0x76/0x90 net/sunrpc/stats.c:195 xprt_release+0xa3b/0x1110 net/sunrpc/xprt.c:1351 rpc_release_resources_task+0x20/0xa0 net/sunrpc/sched.c:1024 rpc_release_task net/sunrpc/sched.c:1068 [inline] __rpc_execute+0x5e9/0xf50 net/sunrpc/sched.c:833 rpc_execute+0x37f/0x480 net/sunrpc/sched.c:852 rpc_run_task+0x615/0x8c0 net/sunrpc/clnt.c:1053 rpc_call_sync+0x196/0x290 net/sunrpc/clnt.c:1082 rpc_ping+0x155/0x1f0 net/sunrpc/clnt.c:2513 rpc_create_xprt+0x282/0x3f0 net/sunrpc/clnt.c:479 rpc_create+0x52e/0x900 net/sunrpc/clnt.c:587 nfs_create_rpc_client+0x63e/0x850 fs/nfs/client.c:523 nfs_init_client+0x74/0x100 fs/nfs/client.c:634 nfs_get_client+0x1065/0x1500 fs/nfs/client.c:425 nfs_init_server+0x364/0xfb0 fs/nfs/client.c:670 nfs_create_server+0x86/0x5f0 fs/nfs/client.c:953 nfs_try_mount+0x177/0xab0 fs/nfs/super.c:1884 nfs_fs_mount+0x17de/0x2efd fs/nfs/super.c:2695 mount_fs+0xae/0x328 fs/super.c:1267 vfs_kern_mount.part.34+0xd4/0x4d0 fs/namespace.c:1037 vfs_kern_mount fs/namespace.c:1027 [inline] do_new_mount fs/namespace.c:2518 [inline] do_mount+0x564/0x3070 fs/namespace.c:2848 ksys_mount+0x12d/0x140 fs/namespace.c:3064 __do_sys_mount fs/namespace.c:3078 [inline] __se_sys_mount fs/namespace.c:3075 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3075 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455979 RSP: 002b:00007f1e2785bc68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f1e2785c6d4 RCX: 0000000000455979 RDX: 0000000020fb5ffc RSI: 0000000020343ff8 RDI: 000000002091dff8 RBP: 000000000072bf50 R08: 000000002000a000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000440 R14: 00000000006fa6a0 R15: 0000000000000001 Allocated by task 5079: 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_track_caller+0x14a/0x760 mm/slab.c:3733 kstrdup+0x39/0x70 mm/util.c:56 xs_format_common_peer_ports+0x130/0x370 net/sunrpc/xprtsock.c:290 xs_format_peer_addresses net/sunrpc/xprtsock.c:303 [inline] xs_setup_udp+0x5ea/0x880 net/sunrpc/xprtsock.c:3037 xprt_create_transport+0x1d7/0x596 net/sunrpc/xprt.c:1433 rpc_create+0x489/0x900 net/sunrpc/clnt.c:573 nfs_create_rpc_client+0x63e/0x850 fs/nfs/client.c:523 nfs_init_client+0x74/0x100 fs/nfs/client.c:634 nfs_get_client+0x1065/0x1500 fs/nfs/client.c:425 nfs_init_server+0x364/0xfb0 fs/nfs/client.c:670 nfs_create_server+0x86/0x5f0 fs/nfs/client.c:953 nfs_try_mount+0x177/0xab0 fs/nfs/super.c:1884 nfs_fs_mount+0x17de/0x2efd fs/nfs/super.c:2695 mount_fs+0xae/0x328 fs/super.c:1267 vfs_kern_mount.part.34+0xd4/0x4d0 fs/namespace.c:1037 vfs_kern_mount fs/namespace.c:1027 [inline] do_new_mount fs/namespace.c:2518 [inline] do_mount+0x564/0x3070 fs/namespace.c:2848 ksys_mount+0x12d/0x140 fs/namespace.c:3064 __do_sys_mount fs/namespace.c:3078 [inline] __se_sys_mount fs/namespace.c:3075 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3075 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 6: 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 xs_update_peer_port net/sunrpc/xprtsock.c:309 [inline] xs_set_port+0x105/0x180 net/sunrpc/xprtsock.c:1827 rpcb_getport_done+0x224/0x2d0 net/sunrpc/rpcb_clnt.c:824 rpc_exit_task+0xc9/0x2d0 net/sunrpc/sched.c:725 __rpc_execute+0x28a/0xf50 net/sunrpc/sched.c:784 rpc_async_schedule+0x16/0x20 net/sunrpc/sched.c:857 process_one_work+0xc1e/0x1b50 kernel/workqueue.c:2145 worker_thread+0x1cc/0x1440 kernel/workqueue.c:2279 kthread+0x345/0x410 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 The buggy address belongs to the object at ffff8801d6f0a1c0 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 0 bytes inside of 32-byte region [ffff8801d6f0a1c0, ffff8801d6f0a1e0) The buggy address belongs to the page: page:ffffea00075bc280 count:1 mapcount:0 mapping:ffff8801d6f0a000 index:0xffff8801d6f0afc1 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffff8801d6f0a000 ffff8801d6f0afc1 0000000100000024 raw: ffffea00075c52a0 ffff8801da801238 ffff8801da8001c0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d6f0a080: 01 fc fc fc fc fc fc fc 00 02 fc fc fc fc fc fc ffff8801d6f0a100: 00 02 fc fc fc fc fc fc 00 02 fc fc fc fc fc fc >ffff8801d6f0a180: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ^ ffff8801d6f0a200: 00 02 fc fc fc fc fc fc 01 fc fc fc fc fc fc fc ffff8801d6f0a280: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ==================================================================