vcan0: j1939_tp_rxtimer: 0x00000000879d9bb9: rx timeout, send abort ================================================================== BUG: KASAN: use-after-free in atomic_sub_return include/asm-generic/atomic-instrumented.h:159 [inline] BUG: KASAN: use-after-free in atomic_dec_return include/linux/atomic-fallback.h:455 [inline] BUG: KASAN: use-after-free in j1939_sock_pending_del+0x26/0x80 net/can/j1939/socket.c:73 Write of size 4 at addr ffff888068b024c0 by task kworker/u4:4/2579 CPU: 1 PID: 2579 Comm: kworker/u4:4 Not tainted 5.4.0-rc6+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374 __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506 kasan_report+0x12/0x20 mm/kasan/common.c:634 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x134/0x1a0 mm/kasan/generic.c:192 __kasan_check_write+0x14/0x20 mm/kasan/common.c:98 atomic_sub_return include/asm-generic/atomic-instrumented.h:159 [inline] atomic_dec_return include/linux/atomic-fallback.h:455 [inline] j1939_sock_pending_del+0x26/0x80 net/can/j1939/socket.c:73 __j1939_session_drop net/can/j1939/transport.c:257 [inline] j1939_session_destroy net/can/j1939/transport.c:270 [inline] __j1939_session_release net/can/j1939/transport.c:280 [inline] kref_put include/linux/kref.h:65 [inline] j1939_session_put+0x107/0x180 net/can/j1939/transport.c:285 j1939_tp_rxtimer+0x26e/0x27b net/can/j1939/transport.c:1177 __run_hrtimer kernel/time/hrtimer.c:1514 [inline] __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1576 hrtimer_run_softirq+0x17e/0x270 kernel/time/hrtimer.c:1593 __do_softirq+0x262/0x98c kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x19b/0x1e0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1137 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 RIP: 0010:lock_release+0x4d2/0x960 kernel/locking/lockdep.c:4496 Code: 00 48 83 3d 7f cc 99 07 00 0f 84 7f 01 00 00 48 8b bd 48 ff ff ff 57 9d 0f 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 01 c3 <48> c7 03 00 00 00 00 c7 43 08 00 00 00 00 48 8b 45 d0 65 48 33 04 RSP: 0018:ffff8880a180fc00 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: ffffed1014301f85 RCX: 1ffff110143001f1 RDX: dffffc0000000000 RSI: 1ffff110143001fd RDI: 0000000000000282 RBP: ffff8880a180fcd0 R08: 0000000000000003 R09: ffff8880a1800f90 R10: fffffbfff138db90 R11: ffffffff89c6dc87 R12: ffff8880a1800700 R13: ffffffff87370b1a R14: ffff8880a180fca8 R15: ffff8880a1800700 rcu_lock_release include/linux/rcupdate.h:213 [inline] rcu_read_unlock include/linux/rcupdate.h:653 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:411 [inline] batadv_nc_worker+0x225/0x760 net/batman-adv/network-coding.c:718 process_one_work+0x9af/0x1740 kernel/workqueue.c:2269 worker_thread+0x98/0xe40 kernel/workqueue.c:2415 kthread+0x361/0x430 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Allocated by task 27594: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc mm/kasan/common.c:510 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:483 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:524 __do_kmalloc mm/slab.c:3655 [inline] __kmalloc+0x163/0x770 mm/slab.c:3664 kmalloc include/linux/slab.h:561 [inline] sk_prot_alloc+0x23a/0x310 net/core/sock.c:1603 sk_alloc+0x39/0xf70 net/core/sock.c:1657 can_create+0x1e7/0x4b0 net/can/af_can.c:157 __sock_create+0x3d8/0x730 net/socket.c:1418 sock_create net/socket.c:1469 [inline] __sys_socket+0x103/0x220 net/socket.c:1511 __do_sys_socket net/socket.c:1520 [inline] __se_sys_socket net/socket.c:1518 [inline] __x64_sys_socket+0x73/0xb0 net/socket.c:1518 do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 2579: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] kasan_set_free_info mm/kasan/common.c:332 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:471 kasan_slab_free+0xe/0x10 mm/kasan/common.c:480 __cache_free mm/slab.c:3425 [inline] kfree+0x10a/0x2c0 mm/slab.c:3756 sk_prot_free net/core/sock.c:1640 [inline] __sk_destruct+0x4aa/0x680 net/core/sock.c:1724 sk_destruct+0xd5/0x110 net/core/sock.c:1739 __sk_free+0xfb/0x360 net/core/sock.c:1750 sock_wfree+0xed/0x190 net/core/sock.c:1966 skb_release_head_state+0xeb/0x260 net/core/skbuff.c:652 skb_release_all+0x16/0x60 net/core/skbuff.c:663 __kfree_skb net/core/skbuff.c:679 [inline] kfree_skb net/core/skbuff.c:697 [inline] kfree_skb+0x101/0x3c0 net/core/skbuff.c:691 skb_queue_purge+0x19/0x40 net/core/skbuff.c:3078 j1939_session_destroy net/can/j1939/transport.c:269 [inline] __j1939_session_release net/can/j1939/transport.c:280 [inline] kref_put include/linux/kref.h:65 [inline] j1939_session_put+0x97/0x180 net/can/j1939/transport.c:285 j1939_tp_rxtimer+0x26e/0x27b net/can/j1939/transport.c:1177 __run_hrtimer kernel/time/hrtimer.c:1514 [inline] __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1576 hrtimer_run_softirq+0x17e/0x270 kernel/time/hrtimer.c:1593 __do_softirq+0x262/0x98c kernel/softirq.c:292 The buggy address belongs to the object at ffff888068b02000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1216 bytes inside of 2048-byte region [ffff888068b02000, ffff888068b02800) The buggy address belongs to the page: page:ffffea0001a2c080 refcount:1 mapcount:0 mapping:ffff8880aa400e00 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea0001ab8908 ffffea000155de88 ffff8880aa400e00 raw: 0000000000000000 ffff888068b02000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888068b02380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888068b02400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888068b02480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888068b02500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888068b02580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================