vcan0: j1939_tp_rxtimer: 0x00000000ad2fefb2: 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+0x7c2/0x9b0 kernel/time/hrtimer.c:1583 Read of size 1 at addr ffff88809485b173 by task syz-executor.3/14442 CPU: 1 PID: 14442 Comm: syz-executor.3 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+0x1e9/0x30e lib/dump_stack.c:118 print_address_description+0x74/0x5c0 mm/kasan/report.c:374 __kasan_report+0x14b/0x1c0 mm/kasan/report.c:506 kasan_report+0x25/0x50 mm/kasan/common.c:641 __run_hrtimer kernel/time/hrtimer.c:1521 [inline] __hrtimer_run_queues+0x7c2/0x9b0 kernel/time/hrtimer.c:1583 hrtimer_run_softirq+0x15a/0x1b0 kernel/time/hrtimer.c:1600 __do_softirq+0x268/0x80c kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x223/0x230 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:546 [inline] smp_apic_timer_interrupt+0x113/0x280 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:console_unlock+0xa25/0xec0 kernel/printk/printk.c:2478 Code: 20 00 74 0c 48 c7 c7 f0 9c 2b 89 e8 d5 ab 53 00 48 83 3d bd 40 cd 07 00 0f 84 65 04 00 00 e8 c2 86 16 00 48 8b 7c 24 10 57 9d <0f> 1f 44 00 00 f6 44 24 07 01 75 52 e8 aa 86 16 00 eb 63 0f 1f 84 RSP: 0018:ffffc90001aa78d0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: ffffffff815e5c3e RBX: 0000000000000200 RCX: 0000000000040000 RDX: ffffc900127cc000 RSI: 000000000003ffff RDI: 0000000000000282 RBP: ffffc90001aa7988 R08: dffffc0000000000 R09: fffffbfff162510f R10: fffffbfff162510f R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff894ce780 vprintk_emit+0x1f8/0x3b0 kernel/printk/printk.c:1993 printk+0x62/0x83 kernel/printk/printk.c:2053 disk_unlock_native_capacity block/partitions/core.c:486 [inline] blk_add_partition block/partitions/core.c:527 [inline] blk_add_partitions+0xafa/0x1240 block/partitions/core.c:624 bdev_disk_changed+0x446/0x5d0 fs/block_dev.c:1543 loop_reread_partitions drivers/block/loop.c:646 [inline] loop_set_status+0xeee/0x1330 drivers/block/loop.c:1358 lo_ioctl+0xb5e/0x2140 drivers/block/loop.c:1468 __blkdev_driver_ioctl block/ioctl.c:322 [inline] blkdev_ioctl+0x2a6/0x5c0 block/ioctl.c:718 block_ioctl+0xbc/0x100 fs/block_dev.c:1995 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl fs/ioctl.c:763 [inline] __do_sys_ioctl fs/ioctl.c:772 [inline] __se_sys_ioctl+0xf9/0x160 fs/ioctl.c:770 do_syscall_64+0xf3/0x1b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45c6b7 Code: 48 83 c4 08 48 89 d8 5b 5d c3 66 0f 1f 84 00 00 00 00 00 48 89 e8 48 f7 d8 48 39 c3 0f 92 c0 eb 92 66 90 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 0d b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f2e8cca29d8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045c6b7 RDX: 00007f2e8cca2ac0 RSI: 0000000000004c04 RDI: 0000000000000005 RBP: 000000000076bf00 R08: 0000000000000000 R09: 000000000000000a R10: 0000000000000075 R11: 0000000000000202 R12: 00000000ffffffff R13: 0000000000000c1b R14: 00000000004c1905 R15: 000000000076bf0c Allocated by task 14465: save_stack mm/kasan/common.c:72 [inline] set_track mm/kasan/common.c:80 [inline] __kasan_kmalloc+0x118/0x1c0 mm/kasan/common.c:515 kmem_cache_alloc_trace+0x234/0x300 mm/slab.c:3551 kmalloc include/linux/slab.h:555 [inline] kzalloc include/linux/slab.h:669 [inline] j1939_session_new+0x75/0x340 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+0x1050/0x20c0 net/can/j1939/transport.c:1653 j1939_tp_cmd_recv net/can/j1939/transport.c:1924 [inline] j1939_tp_recv+0x81f/0xb80 net/can/j1939/transport.c:2005 j1939_can_recv+0x479/0x6e0 net/can/j1939/main.c:101 deliver net/can/af_can.c:569 [inline] can_rcv_filter+0x37f/0x850 net/can/af_can.c:603 can_receive+0x2ad/0x3b0 net/can/af_can.c:660 can_rcv+0xdc/0x210 net/can/af_can.c:686 __netif_receive_skb_one_core net/core/dev.c:5187 [inline] __netif_receive_skb+0x136/0x370 net/core/dev.c:5301 process_backlog+0x4e8/0x950 net/core/dev.c:6133 napi_poll net/core/dev.c:6571 [inline] net_rx_action+0x62f/0x1140 net/core/dev.c:6639 __do_softirq+0x268/0x80c kernel/softirq.c:292 Freed by task 14442: save_stack mm/kasan/common.c:72 [inline] set_track mm/kasan/common.c:80 [inline] kasan_set_free_info mm/kasan/common.c:337 [inline] __kasan_slab_free+0x12e/0x1e0 mm/kasan/common.c:476 __cache_free mm/slab.c:3426 [inline] kfree+0x10a/0x220 mm/slab.c:3757 j1939_tp_rxtimer+0x27b/0x330 net/can/j1939/transport.c:1194 __run_hrtimer kernel/time/hrtimer.c:1519 [inline] __hrtimer_run_queues+0x48e/0x9b0 kernel/time/hrtimer.c:1583 hrtimer_run_softirq+0x15a/0x1b0 kernel/time/hrtimer.c:1600 __do_softirq+0x268/0x80c kernel/softirq.c:292 The buggy address belongs to the object at ffff88809485b000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 371 bytes inside of 512-byte region [ffff88809485b000, ffff88809485b200) The buggy address belongs to the page: page:ffffea00025216c0 refcount:1 mapcount:0 mapping:ffff8880aa400a80 index:0x0 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea0000a660c8 ffffea0001849fc8 ffff8880aa400a80 raw: 0000000000000000 ffff88809485b000 0000000100000004 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809485b000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809485b080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88809485b100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88809485b180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809485b200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================