================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x3a8b/0x4b70 kernel/locking/lockdep.c:3753 Read of size 8 at addr ffff8880797f95c0 by task syz-executor.2/14428 CPU: 0 PID: 14428 Comm: syz-executor.2 Not tainted 5.3.0-rc7+ #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+0x113/0x167 lib/dump_stack.c:113 print_address_description.cold.8+0x9/0x318 mm/kasan/report.c:351 __kasan_report.cold.9+0x1b/0x3f mm/kasan/report.c:482 kasan_report+0x12/0x17 mm/kasan/common.c:618 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132 __lock_acquire+0x3a8b/0x4b70 kernel/locking/lockdep.c:3753 lock_acquire+0x194/0x410 kernel/locking/lockdep.c:4412 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:135 [inline] _raw_spin_lock_bh+0x31/0x40 kernel/locking/spinlock.c:175 spin_lock_bh include/linux/spinlock.h:343 [inline] j1939_sk_recv+0x2a/0x2e0 net/can/j1939/socket.c:345 j1939_can_recv+0x43f/0x590 net/can/j1939/main.c:105 deliver net/can/af_can.c:568 [inline] can_rcv_filter+0x4ff/0x840 net/can/af_can.c:602 can_receive+0x290/0x470 net/can/af_can.c:659 can_rcv+0xd9/0x160 net/can/af_can.c:685 __netif_receive_skb_one_core+0xe9/0x170 net/core/dev.c:5006 __netif_receive_skb+0x1f/0x1b0 net/core/dev.c:5120 process_backlog+0x1cb/0x670 net/core/dev.c:5951 napi_poll net/core/dev.c:6388 [inline] net_rx_action+0x458/0xe40 net/core/dev.c:6456 __do_softirq+0x262/0x9a8 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x19a/0x1d0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:537 [inline] smp_apic_timer_interrupt+0x1a6/0x5f0 arch/x86/kernel/apic/apic.c:1133 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:768 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xaf/0xd0 kernel/locking/spinlock.c:191 Code: 90 9e 32 88 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 28 48 83 3d 98 45 77 01 00 74 15 48 89 df 57 9d <0f> 1f 44 00 00 eb ad e8 85 00 45 fa eb bb 0f 0b 0f 0b e8 0a 71 de RSP: 0018:ffff88807957f938 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: 0000000000000286 RCX: 0000000000000000 RDX: 1ffffffff10653d2 RSI: 0000000000000006 RDI: 0000000000000286 RBP: ffff88807957f948 R08: 0000000000000006 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88808d104a90 R13: 0000000000000001 R14: ffff8880aeb35818 R15: ffff8880aeb206e0 try_to_wake_up+0x76b/0x1870 kernel/sched/core.c:2526 wake_up_process kernel/sched/core.c:2548 [inline] wake_up_q+0xa0/0xf0 kernel/sched/core.c:495 futex_wake+0x330/0x560 kernel/futex.c:1638 do_futex+0x59a/0x1880 kernel/futex.c:3651 __do_sys_futex kernel/futex.c:3707 [inline] __se_sys_futex kernel/futex.c:3675 [inline] __x64_sys_futex+0x1cb/0x390 kernel/futex.c:3675 do_syscall_64+0xd0/0x540 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a219 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ff6faa05cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 000000000075bf28 RCX: 000000000045a219 RDX: 00000000004c7ab3 RSI: 0000000000000081 RDI: 000000000075bf2c RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000246 R12: 000000000075bf2c R13: 00007ffe663e8c4f R14: 00007ff6faa069c0 R15: 000000000075bf2c Allocated by task 14428: save_stack+0x21/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc.constprop.9+0xc7/0xd0 mm/kasan/common.c:493 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:507 kmem_cache_alloc_trace+0x15b/0x780 mm/slab.c:3550 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:748 [inline] j1939_priv_create net/can/j1939/main.c:122 [inline] j1939_netdev_start+0x93/0x510 net/can/j1939/main.c:251 j1939_sk_bind+0x5b6/0x870 net/can/j1939/socket.c:438 __sys_bind+0x1e1/0x230 net/socket.c:1647 __do_sys_bind net/socket.c:1658 [inline] __se_sys_bind net/socket.c:1656 [inline] __x64_sys_bind+0x6e/0xb0 net/socket.c:1656 do_syscall_64+0xd0/0x540 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 14427: save_stack+0x21/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:455 kasan_slab_free+0xe/0x10 mm/kasan/common.c:463 __cache_free mm/slab.c:3425 [inline] kfree+0x108/0x2c0 mm/slab.c:3756 __j1939_priv_release net/can/j1939/main.c:154 [inline] kref_put include/linux/kref.h:65 [inline] j1939_priv_put+0x70/0x90 net/can/j1939/main.c:159 j1939_netdev_stop+0x2d/0x170 net/can/j1939/main.c:291 j1939_sk_release+0x322/0x4c0 net/can/j1939/socket.c:580 __sock_release+0xc2/0x270 net/socket.c:590 sock_close+0x13/0x20 net/socket.c:1268 __fput+0x25a/0x770 fs/file_table.c:280 ____fput+0x9/0x10 fs/file_table.c:313 task_work_run+0x108/0x180 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x24e/0x2e0 arch/x86/entry/common.c:163 prepare_exit_to_usermode arch/x86/entry/common.c:194 [inline] syscall_return_slowpath arch/x86/entry/common.c:274 [inline] do_syscall_64+0x462/0x540 arch/x86/entry/common.c:299 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880797f8500 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 4288 bytes inside of 8192-byte region [ffff8880797f8500, ffff8880797fa500) The buggy address belongs to the page: page:ffffea0001e5fe00 refcount:1 mapcount:0 mapping:ffff8880aa4021c0 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea0002315a08 ffffea0001e35c08 ffff8880aa4021c0 raw: 0000000000000000 ffff8880797f8500 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880797f9480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880797f9500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880797f9580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880797f9600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880797f9680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================