vcan0: j1939_tp_rxtimer: 0x000000006c97dc91: rx timeout, send abort vcan0: j1939_tp_rxtimer: 0x000000006c97dc91: 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 ffff8880953a4d73 by task systemd-udevd/30256 CPU: 1 PID: 30256 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: __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:kfree+0x1fe/0x2b0 mm/slab.c:3758 Code: 75 6b 48 83 3d e2 da e4 07 00 0f 85 4e ff ff ff 0f 0b e8 65 a6 c8 ff 48 83 3d cd da e4 07 00 0f 84 b3 00 00 00 48 89 df 57 9d <0f> 1f 44 00 00 5b 5d 41 5c 41 5d c3 65 ff 05 17 6d 52 7e 48 8b 05 RSP: 0018:ffffc900017d7c00 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: 0000000000000282 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff888056168a40 RDI: 0000000000000282 RBP: ffff888087ed1240 R08: ffff888056168180 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880aa0001c0 R13: ffffffff835a2d91 R14: ffffc900017d7de0 R15: 0000000000000003 tomoyo_path_number_perm+0x411/0x4d0 security/tomoyo/file.c:736 security_file_ioctl+0x6c/0xb0 security/security.c:1460 ksys_ioctl+0x50/0x180 fs/ioctl.c:757 __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl fs/ioctl.c:770 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x7fa4859e1017 Code: 00 00 00 48 8b 05 81 7e 2b 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 51 7e 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffe0f055dc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000000000f RCX: 00007fa4859e1017 RDX: 00007ffe0f055ed8 RSI: 0000000080081272 RDI: 000000000000000f RBP: 00007ffe0f055ed8 R08: 00007ffe0f055a20 R09: 0000000000000000 R10: 0000000000000541 R11: 0000000000000202 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 000000000000000f Allocated by task 30178: 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 30256: 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 ffff8880953a4c00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 371 bytes inside of 512-byte region [ffff8880953a4c00, ffff8880953a4e00) The buggy address belongs to the page: page:ffffea000254e900 refcount:1 mapcount:0 mapping:ffff8880aa000a80 index:0x0 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea000279ffc8 ffffea0002860348 ffff8880aa000a80 raw: 0000000000000000 ffff8880953a4000 0000000100000004 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880953a4c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880953a4c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880953a4d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880953a4d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880953a4e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================