vcan0: j1939_tp_rxtimer: 0x0000000006de5dd0: abort rx timeout. Force session deactivation ================================================================== BUG: KASAN: use-after-free in __run_hrtimer kernel/time/hrtimer.c:1521 [inline] BUG: KASAN: use-after-free in __hrtimer_run_queues+0xe18/0xf10 kernel/time/hrtimer.c:1583 Read of size 1 at addr ffff888060d87173 by task syz-executor.0/7024 CPU: 1 PID: 7024 Comm: syz-executor.0 Not tainted 5.6.0-syzkaller #0 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+0x188/0x20d lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd3/0x315 mm/kasan/report.c:374 __kasan_report.cold+0x1a/0x32 mm/kasan/report.c:506 kasan_report+0xe/0x20 mm/kasan/common.c:641 __run_hrtimer kernel/time/hrtimer.c:1521 [inline] __hrtimer_run_queues+0xe18/0xf10 kernel/time/hrtimer.c:1583 hrtimer_run_softirq+0x16d/0x250 kernel/time/hrtimer.c:1600 __do_softirq+0x26c/0x9f7 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x192/0x1d0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:546 [inline] smp_apic_timer_interrupt+0x19e/0x600 arch/x86/kernel/apic/apic.c:1140 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:vm_normal_page+0x51/0x380 mm/memory.c:594 Code: b5 41 48 c7 44 24 08 3f 7f 47 89 48 c1 ed 03 48 c7 44 24 10 b0 e6 9f 81 48 8d 44 1d 00 c7 00 f1 f1 f1 f1 c7 40 04 00 f3 f3 f3 <65> 48 8b 04 25 28 00 00 00 48 89 44 24 58 31 c0 48 89 54 24 20 e8 RSP: 0018:ffffc900016b77d0 EFLAGS: 00000a06 ORIG_RAX: ffffffffffffff13 RAX: fffff520002d6efa RBX: dffffc0000000000 RCX: ffffffff81a1029a RDX: 80000000a78e5007 RSI: 00007f8399de0000 RDI: ffff888093255148 RBP: 1ffff920002d6efa R08: ffff8880a7d08400 R09: fffff9400053c721 R10: fffff9400053c720 R11: ffffea00029e3907 R12: ffff888093255148 R13: 00007f8399de0000 R14: 0000000000000008 R15: 0000000000000028 copy_one_pte mm/memory.c:788 [inline] copy_pte_range mm/memory.c:841 [inline] copy_pmd_range mm/memory.c:892 [inline] copy_pud_range mm/memory.c:926 [inline] copy_p4d_range mm/memory.c:948 [inline] copy_page_range+0xc65/0x1f30 mm/memory.c:1010 dup_mmap kernel/fork.c:604 [inline] dup_mm+0x9cf/0x1340 kernel/fork.c:1360 copy_mm kernel/fork.c:1416 [inline] copy_process+0x29cc/0x72c0 kernel/fork.c:2082 _do_fork+0x12d/0x1010 kernel/fork.c:2431 __do_sys_clone kernel/fork.c:2586 [inline] __se_sys_clone kernel/fork.c:2567 [inline] __x64_sys_clone+0x182/0x210 kernel/fork.c:2567 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ae1a Code: f7 d8 64 89 04 25 d4 02 00 00 64 4c 8b 0c 25 10 00 00 00 31 d2 4d 8d 91 d0 02 00 00 31 f6 bf 11 00 20 01 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 f5 00 00 00 85 c0 41 89 c5 0f 85 fc 00 00 RSP: 002b:0000000000c7fd60 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 0000000000c7fd60 RCX: 000000000045ae1a RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000c7fda0 R08: 0000000000000001 R09: 000000000106a940 R10: 000000000106ac10 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000c7fdf0 Allocated by task 29534: save_stack+0x1b/0x80 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] __kasan_kmalloc mm/kasan/common.c:515 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:488 kmem_cache_alloc_trace+0x153/0x7d0 mm/slab.c:3551 kmalloc include/linux/slab.h:555 [inline] kzalloc include/linux/slab.h:669 [inline] j1939_session_new+0x7c/0x3f0 net/can/j1939/transport.c:1418 j1939_session_fresh_new net/can/j1939/transport.c:1469 [inline] j1939_xtp_rx_rts_session_new net/can/j1939/transport.c:1552 [inline] j1939_xtp_rx_rts+0x898/0xef0 net/can/j1939/transport.c:1653 j1939_tp_cmd_recv net/can/j1939/transport.c:1924 [inline] j1939_tp_recv+0x639/0x970 net/can/j1939/transport.c:2005 j1939_can_recv+0x587/0x6f0 net/can/j1939/main.c:101 deliver net/can/af_can.c:569 [inline] can_rcv_filter+0x2a1/0x8e0 net/can/af_can.c:603 can_receive+0x2e3/0x520 net/can/af_can.c:660 can_rcv+0x12a/0x1a0 net/can/af_can.c:686 __netif_receive_skb_one_core+0xf5/0x160 net/core/dev.c:5187 __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5301 process_backlog+0x21e/0x7a0 net/core/dev.c:6133 napi_poll net/core/dev.c:6571 [inline] net_rx_action+0x4c2/0x1070 net/core/dev.c:6639 __do_softirq+0x26c/0x9f7 kernel/softirq.c:292 Freed by task 7024: save_stack+0x1b/0x80 mm/kasan/common.c:72 set_track mm/kasan/common.c:80 [inline] kasan_set_free_info mm/kasan/common.c:337 [inline] __kasan_slab_free+0xf7/0x140 mm/kasan/common.c:476 __cache_free mm/slab.c:3426 [inline] kfree+0x109/0x2b0 mm/slab.c:3757 j1939_session_destroy net/can/j1939/transport.c:276 [inline] __j1939_session_release net/can/j1939/transport.c:284 [inline] kref_put include/linux/kref.h:65 [inline] j1939_session_put+0x25c/0x330 net/can/j1939/transport.c:289 j1939_tp_rxtimer+0x2e9/0x2f4 net/can/j1939/transport.c:1194 __run_hrtimer kernel/time/hrtimer.c:1519 [inline] __hrtimer_run_queues+0x3a2/0xf10 kernel/time/hrtimer.c:1583 hrtimer_run_softirq+0x16d/0x250 kernel/time/hrtimer.c:1600 __do_softirq+0x26c/0x9f7 kernel/softirq.c:292 The buggy address belongs to the object at ffff888060d87000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 371 bytes inside of 512-byte region [ffff888060d87000, ffff888060d87200) The buggy address belongs to the page: page:ffffea00018361c0 refcount:1 mapcount:0 mapping:ffff8880aa000a80 index:0x0 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea0002614d88 ffffea00022fea08 ffff8880aa000a80 raw: 0000000000000000 ffff888060d87000 0000000100000004 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888060d87000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888060d87080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888060d87100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888060d87180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888060d87200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================