vcan0: j1939_tp_rxtimer: 0x00000000d9259810: 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 ffff88804ec34573 by task kworker/u4:9/23138 CPU: 1 PID: 23138 Comm: kworker/u4:9 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:arch_local_irq_restore arch/x86/include/asm/paravirt.h:759 [inline] RIP: 0010:lock_acquire+0x267/0x8f0 kernel/locking/lockdep.c:4926 Code: 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 c6 05 00 00 48 83 3d 15 37 3b 08 00 0f 84 65 04 00 00 48 8b 3c 24 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 03 44 24 08 48 c7 RSP: 0018:ffffc900016a7818 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff132918c RBX: ffff88804bcea580 RCX: 1a9e90ebe18606b9 RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 0000000000000282 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001 R10: fffffbfff1857786 R11: ffffffff8c2bbc37 R12: 0000000000000000 R13: ffffffff89a60c40 R14: 0000000000000000 R15: 0000000000000000 __fs_reclaim_acquire mm/page_alloc.c:4073 [inline] fs_reclaim_acquire.part.0+0x20/0x30 mm/page_alloc.c:4084 slab_pre_alloc_hook mm/slab.h:562 [inline] slab_alloc mm/slab.c:3306 [inline] kmem_cache_alloc+0x26/0x740 mm/slab.c:3484 kmem_cache_zalloc include/linux/slab.h:659 [inline] __alloc_file+0x21/0x350 fs/file_table.c:101 alloc_empty_file+0x6d/0x170 fs/file_table.c:151 path_openat+0xef/0x32c0 fs/namei.c:3596 do_filp_open+0x192/0x260 fs/namei.c:3637 do_open_execat+0x122/0x600 fs/exec.c:860 __do_execve_file.isra.0+0x16d5/0x2270 fs/exec.c:1791 do_execveat_common fs/exec.c:1897 [inline] do_execve+0x2e/0x40 fs/exec.c:1914 call_usermodehelper_exec_async+0x588/0x710 kernel/umh.c:112 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Allocated by task 16: 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 23138: 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 ffff88804ec34400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 371 bytes inside of 512-byte region [ffff88804ec34400, ffff88804ec34600) The buggy address belongs to the page: page:ffffea00013b0d00 refcount:1 mapcount:0 mapping:ffff8880aa000a80 index:0x0 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea00013917c8 ffffea0001004788 ffff8880aa000a80 raw: 0000000000000000 ffff88804ec34000 0000000100000004 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88804ec34400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804ec34480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88804ec34500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88804ec34580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804ec34600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================