vcan0: j1939_tp_rxtimer: 0x0000000029d47b65: 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 ffff888091138173 by task systemd-udevd/4112 CPU: 0 PID: 4112 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:slab_alloc mm/slab.c:3313 [inline] RIP: 0010:kmem_cache_alloc+0x274/0x740 mm/slab.c:3484 Code: 52 7e 0f 85 e3 fe ff ff e8 3d d8 50 ff e9 d9 fe ff ff e8 9f c9 c8 ff 48 83 3d 07 fe e4 07 00 0f 84 7e 03 00 00 4c 89 f7 57 9d <0f> 1f 44 00 00 e9 71 fe ff ff 31 d2 be 35 02 00 00 48 c7 c7 ec 16 RSP: 0018:ffffc90001477c48 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: 0000000000000cc0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000282 RBP: ffff8880aa1eb000 R08: ffff88809ff62040 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880aa1eb000 R13: 0000000000000cc0 R14: 0000000000000282 R15: ffff8880559d66c0 getname_flags fs/namei.c:138 [inline] getname_flags+0xd2/0x5b0 fs/namei.c:128 user_path_at_empty+0x2a/0x50 fs/namei.c:2746 user_path_at include/linux/namei.h:58 [inline] vfs_statx+0x119/0x1e0 fs/stat.c:197 vfs_stat include/linux/fs.h:3274 [inline] __do_sys_newstat+0x96/0x120 fs/stat.c:351 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x7fcdf1bf6295 Code: 00 00 00 e8 5d 01 00 00 48 83 c4 18 c3 0f 1f 84 00 00 00 00 00 83 ff 01 48 89 f0 77 30 48 89 c7 48 89 d6 b8 04 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 03 f3 c3 90 48 8b 15 d1 db 2b 00 f7 d8 64 89 RSP: 002b:00007ffe035936b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 0000564dc0ed0978 RCX: 00007fcdf1bf6295 RDX: 00007ffe035936d0 RSI: 00007ffe035936d0 RDI: 0000564dc0eb04fc RBP: 0000564dc12b0af8 R08: 00000000000000e2 R09: 0000000000000018 R10: 00058e3555e47640 R11: 0000000000000246 R12: 00007ffe035936d0 R13: 0000000000000000 R14: 00007ffe03593728 R15: 0000000000000000 Allocated by task 30846: 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 4112: 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 ffff888091138000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 371 bytes inside of 512-byte region [ffff888091138000, ffff888091138200) The buggy address belongs to the page: page:ffffea0002444e00 refcount:1 mapcount:0 mapping:ffff8880aa000a80 index:0xffff888091138c00 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea00027ef348 ffffea000157c908 ffff8880aa000a80 raw: ffff888091138c00 ffff888091138000 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888091138000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888091138080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888091138100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888091138180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888091138200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================