vcan0: j1939_tp_rxtimer: 0x00000000521d41ef: abort rx timeout. Force session deactivation
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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 ffff88809fc83d73 by task systemd-udevd/24681

CPU: 1 PID: 24681 Comm: systemd-udevd Not tainted 5.6.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __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
 </IRQ>
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 d5 41 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:ffffc90001a378c0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff132918c RBX: ffff888085332040 RCX: 6aeb48c46913eed3
RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 0000000000000282
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: fffffbfff1856185 R11: ffffffff8c2b0c2f R12: 0000000000000000
R13: ffff8880a3fe5d90 R14: 0000000000000000 R15: 0000000000000000
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151
 spin_lock include/linux/spinlock.h:353 [inline]
 lockref_get_not_dead+0x14/0x80 lib/lockref.c:211
 legitimize_path.isra.0+0x7e/0x1c0 fs/namei.c:621
 unlazy_walk+0x109/0x3a0 fs/namei.c:689
 may_lookup fs/namei.c:1785 [inline]
 link_path_walk.part.0+0x953/0x1250 fs/namei.c:2184
 link_path_walk fs/namei.c:2387 [inline]
 path_lookupat.isra.0+0x7c/0x460 fs/namei.c:2435
 filename_lookup+0x1a3/0x3e0 fs/namei.c:2466
 user_path_at include/linux/namei.h:58 [inline]
 vfs_statx+0x119/0x1e0 fs/stat.c:197
 vfs_lstat include/linux/fs.h:3279 [inline]
 __do_sys_newlstat+0x96/0x120 fs/stat.c:364
 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x7f487b43b335
Code: 69 db 2b 00 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 83 ff 01 48 89 f0 77 30 48 89 c7 48 89 d6 b8 06 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 03 f3 c3 90 48 8b 15 31 db 2b 00 f7 d8 64 89
RSP: 002b:00007ffd318dd4c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000006
RAX: ffffffffffffffda RBX: 000055b5c1bfb910 RCX: 00007f487b43b335
RDX: 00007ffd318dd500 RSI: 00007ffd318dd500 RDI: 000055b5c1bfa910
RBP: 00007ffd318dd5c0 R08: 00007f487b6fa178 R09: 0000000000001010
R10: 000055b5c1be98c0 R11: 0000000000000246 R12: 000055b5c1bfa910
R13: 000055b5c1bfa934 R14: 000055b5c1be9ace R15: 000055b5c1be9ad4

Allocated by task 24708:
 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_tp_send+0x22f/0x800 net/can/j1939/transport.c:1877
 j1939_sk_send_loop net/can/j1939/socket.c:1037 [inline]
 j1939_sk_sendmsg+0xabf/0x1360 net/can/j1939/socket.c:1160
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:672
 ____sys_sendmsg+0x308/0x7e0 net/socket.c:2362
 ___sys_sendmsg+0x100/0x170 net/socket.c:2416
 __sys_sendmmsg+0x195/0x480 net/socket.c:2506
 __do_sys_sendmmsg net/socket.c:2535 [inline]
 __se_sys_sendmmsg net/socket.c:2532 [inline]
 __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2532
 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3

Freed by task 24681:
 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 ffff88809fc83c00
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 371 bytes inside of
 512-byte region [ffff88809fc83c00, ffff88809fc83e00)
The buggy address belongs to the page:
page:ffffea00027f20c0 refcount:1 mapcount:0 mapping:ffff8880aa000a80 index:0x0
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea00023afa48 ffffea0002628588 ffff8880aa000a80
raw: 0000000000000000 ffff88809fc83000 0000000100000004 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809fc83c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88809fc83c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88809fc83d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                             ^
 ffff88809fc83d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88809fc83e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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