vcan0: j1939_tp_rxtimer: 0x00000000734fe140: 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 ffff888098499973 by task syz-executor.2/7407 CPU: 1 PID: 7407 Comm: syz-executor.2 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_save_flags arch/x86/include/asm/paravirt.h:754 [inline] RIP: 0010:arch_local_irq_save arch/x86/include/asm/paravirt.h:776 [inline] RIP: 0010:lock_is_held_type+0x7c/0x350 kernel/locking/lockdep.c:4956 Code: 08 00 00 85 d2 0f 85 24 02 00 00 48 c7 c0 58 8c 94 89 48 b9 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 08 00 0f 85 c3 02 00 00 <48> 83 3d 54 1d 3c 08 00 0f 84 ff 01 00 00 9c 58 0f 1f 44 00 00 48 RSP: 0018:ffffc90003edf868 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff132918b RBX: ffff88806593a2c0 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffff88806593ab7c RBP: ffffffff88371fa0 R08: ffff88806593a2c0 R09: fffff9400029a939 R10: fffff9400029a938 R11: ffffea00014d49c7 R12: 000000000000054a R13: 0000000000000000 R14: ffff8880434cd738 R15: ffffffff899baa80 lock_is_held include/linux/lockdep.h:406 [inline] ___might_sleep+0x1fc/0x2b0 kernel/sched/core.c:6777 __getblk_gfp+0x4d/0xae0 fs/buffer.c:1354 sb_getblk include/linux/buffer_head.h:325 [inline] ext4_getblk+0x162/0x520 fs/ext4/inode.c:833 ext4_bread_batch+0x7d/0x560 fs/ext4/inode.c:896 __ext4_find_entry+0x45c/0xfc0 fs/ext4/namei.c:1523 ext4_find_entry+0x11e/0x170 fs/ext4/namei.c:1603 ext4_unlink fs/ext4/namei.c:3196 [inline] ext4_unlink+0x1fc/0x1170 fs/ext4/namei.c:3174 vfs_unlink+0x2d4/0x620 fs/namei.c:4073 do_unlinkat+0x3c4/0x680 fs/namei.c:4137 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45c5c7 Code: 00 66 90 b8 58 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 4d b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 2d b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffc82b566c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045c5c7 RDX: 00007ffc82b566e0 RSI: 00007ffc82b566e0 RDI: 00007ffc82b56770 RBP: 0000000000000723 R08: 0000000000000000 R09: 0000000000000010 R10: 000000000000000a R11: 0000000000000246 R12: 00007ffc82b57800 R13: 0000000001d46940 R14: 0000000000000000 R15: 00007ffc82b57800 Allocated by task 25019: 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+0x6bf/0x7e0 net/socket.c:2362 ___sys_sendmsg+0x100/0x170 net/socket.c:2416 __sys_sendmsg+0xec/0x1b0 net/socket.c:2449 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 Freed by task 7407: 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 ffff888098499800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 371 bytes inside of 512-byte region [ffff888098499800, ffff888098499a00) The buggy address belongs to the page: page:ffffea0002612640 refcount:1 mapcount:0 mapping:ffff8880aa000a80 index:0x0 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea00023954c8 ffffea0002542e88 ffff8880aa000a80 raw: 0000000000000000 ffff888098499000 0000000100000004 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888098499800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888098499880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888098499900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888098499980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888098499a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc 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