Enabling of bearer rejected, already enabled Enabling of bearer rejected, already enabled Enabling of bearer rejected, already enabled Enabling of bearer rejected, already enabled ================================================================== BUG: KASAN: use-after-free in rt_cache_valid+0x158/0x190 net/ipv4/route.c:1510 Read of size 2 at addr ffff88809bfce836 by task udevd/7435 CPU: 1 PID: 7435 Comm: udevd Not tainted 5.0.0-rc6+ #69 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+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 __asan_report_load2_noabort+0x14/0x20 mm/kasan/generic_report.c:133 rt_cache_valid+0x158/0x190 net/ipv4/route.c:1510 __mkroute_output net/ipv4/route.c:2260 [inline] ip_route_output_key_hash_rcu+0x89d/0x30e0 net/ipv4/route.c:2492 Enabling of bearer rejected, already enabled ip_route_output_key_hash+0x212/0x380 net/ipv4/route.c:2321 Enabling of bearer rejected, already enabled __ip_route_output_key include/net/route.h:124 [inline] ip_route_output_flow+0x28/0xc0 net/ipv4/route.c:2576 ip_route_output_key include/net/route.h:134 [inline] tipc_udp_xmit.isra.0+0x55d/0xcc0 net/tipc/udp_media.c:173 Enabling of bearer rejected, already enabled tipc_udp_send_msg+0x295/0x4a0 net/tipc/udp_media.c:247 tipc_bearer_xmit_skb+0x172/0x360 net/tipc/bearer.c:503 Enabling of bearer rejected, already enabled tipc_disc_timeout+0x933/0xd60 net/tipc/discover.c:332 call_timer_fn+0x190/0x720 kernel/time/timer.c:1325 Enabling of bearer rejected, already enabled expire_timers kernel/time/timer.c:1362 [inline] __run_timers kernel/time/timer.c:1681 [inline] __run_timers kernel/time/timer.c:1649 [inline] run_timer_softirq+0x652/0x1700 kernel/time/timer.c:1694 Enabling of bearer rejected, already enabled __do_softirq+0x266/0x95a kernel/softirq.c:292 Enabling of bearer rejected, already enabled invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x180/0x1d0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x14a/0x570 arch/x86/kernel/apic/apic.c:1062 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 Enabling of bearer rejected, already enabled RIP: 0010:generic_fillattr+0x54c/0x6e0 fs/stat.c:51 Code: 7c 24 0c 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 ee 00 00 00 45 8b 64 24 0c 31 ff <41> 81 e4 00 08 00 00 44 89 e6 e8 15 21 bf ff 45 85 e4 74 2c e8 8b RSP: 0018:ffff88809894fc58 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: ffff88809894fde8 RCX: ffffffff81b0c113 RDX: 0000000000000000 RSI: ffffffff81b0c146 RDI: 0000000000000000 RBP: ffff88809894fc78 R08: ffff8880925de340 R09: ffff88809894fde8 R10: ffffed1013129fcd R11: ffff88809894fe6f R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000800 R15: ffff888098d4d100 vfs_getattr_nosec+0x140/0x180 fs/stat.c:82 vfs_getattr+0x4b/0x70 fs/stat.c:116 Enabling of bearer rejected, already enabled vfs_statx+0x157/0x200 fs/stat.c:189 Enabling of bearer rejected, already enabled vfs_stat include/linux/fs.h:3171 [inline] __do_sys_newstat+0xa4/0x130 fs/stat.c:339 Enabling of bearer rejected, already enabled Enabling of bearer rejected, already enabled kobject: 'loop0' (000000003275aa21): kobject_uevent_env __se_sys_newstat fs/stat.c:335 [inline] __x64_sys_newstat+0x54/0x80 fs/stat.c:335 kobject: 'loop0' (000000003275aa21): fill_kobj_path: path = '/devices/virtual/block/loop0' do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fda7f482c65 Code: 00 00 00 e8 5d 01 00 00 48 83 c4 18 c3 90 90 90 90 90 90 90 90 83 ff 01 48 89 f0 77 18 48 89 c7 48 89 d6 b8 04 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 17 f3 c3 90 48 8b 05 a1 51 2b 00 64 c7 00 16 RSP: 002b:00007ffefd39a338 EFLAGS: 00000246 ORIG_RAX: 0000000000000004 Enabling of bearer rejected, already enabled RAX: ffffffffffffffda RBX: 00007ffefd39a3d0 RCX: 00007fda7f482c65 RDX: 00007ffefd39a340 RSI: 00007ffefd39a340 RDI: 00007ffefd39a3d0 RBP: 0000000001125980 R08: 00007ffefd39a3e0 R09: 00007fda7f4d9790 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000001114250 R13: 0000000000000000 R14: 00007ffefd39a840 R15: 0000000000000001 Enabling of bearer rejected, already enabled Allocated by task 7724: save_stack+0x45/0xd0 mm/kasan/common.c:73 kobject: 'loop0' (000000003275aa21): kobject_uevent_env set_track mm/kasan/common.c:85 [inline] __kasan_kmalloc mm/kasan/common.c:496 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:469 kobject: 'loop0' (000000003275aa21): fill_kobj_path: path = '/devices/virtual/block/loop0' kasan_kmalloc mm/kasan/common.c:504 [inline] kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:411 Enabling of bearer rejected, already enabled kmem_cache_alloc+0x12d/0x710 mm/slab.c:3543 dst_alloc+0x10e/0x1d0 net/core/dst.c:105 rt_dst_alloc+0x83/0x3f0 net/ipv4/route.c:1566 __mkroute_output net/ipv4/route.c:2265 [inline] ip_route_output_key_hash_rcu+0x97d/0x30e0 net/ipv4/route.c:2492 Enabling of bearer rejected, already enabled ip_route_output_key_hash+0x212/0x380 net/ipv4/route.c:2321 __ip_route_output_key include/net/route.h:124 [inline] ip_route_connect include/net/route.h:302 [inline] __ip4_datagram_connect+0x6fb/0x1330 net/ipv4/datagram.c:51 __ip6_datagram_connect+0xa6a/0x1390 net/ipv6/datagram.c:152 kobject: 'loop0' (000000003275aa21): kobject_uevent_env ip6_datagram_connect+0x30/0x50 net/ipv6/datagram.c:273 inet_dgram_connect+0x150/0x2e0 net/ipv4/af_inet.c:571 __sys_connect+0x266/0x330 net/socket.c:1662 __do_sys_connect net/socket.c:1673 [inline] __se_sys_connect net/socket.c:1670 [inline] __x64_sys_connect+0x73/0xb0 net/socket.c:1670 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe kobject: 'loop0' (000000003275aa21): fill_kobj_path: path = '/devices/virtual/block/loop0' Freed by task 0: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:458 kasan_slab_free+0xe/0x10 mm/kasan/common.c:466 __cache_free mm/slab.c:3487 [inline] kmem_cache_free+0x86/0x260 mm/slab.c:3749 dst_destroy+0x2a0/0x3c0 net/core/dst.c:141 dst_destroy_rcu+0x16/0x19 net/core/dst.c:154 __rcu_reclaim kernel/rcu/rcu.h:240 [inline] rcu_do_batch kernel/rcu/tree.c:2452 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2773 [inline] rcu_process_callbacks+0x928/0x1390 kernel/rcu/tree.c:2754 cgroup: fork rejected by pids controller in /syz0 __do_softirq+0x266/0x95a kernel/softirq.c:292 The buggy address belongs to the object at ffff88809bfce800 which belongs to the cache ip_dst_cache of size 160 The buggy address is located 54 bytes inside of 160-byte region [ffff88809bfce800, ffff88809bfce8a0) The buggy address belongs to the page: page:ffffea00026ff380 count:1 mapcount:0 mapping:ffff88821af8d1c0 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea000297e848 ffff8880a68abd48 ffff88821af8d1c0 raw: 0000000000000000 ffff88809bfce000 0000000100000010 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809bfce700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88809bfce780: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc >ffff88809bfce800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88809bfce880: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc ffff88809bfce900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================