RDX: 0000000020000000 RSI: 00000000000089e1 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000014 R13: 00000000004bfe58 R14: 00000000004cf778 R15: 0000000000000001 ================================================================== BUG: KASAN: slab-out-of-bounds in __ptr_ring_produce include/linux/ptr_ring.h:110 [inline] BUG: KASAN: slab-out-of-bounds in ptr_ring_produce include/linux/ptr_ring.h:133 [inline] BUG: KASAN: slab-out-of-bounds in tun_net_xmit+0x1b28/0x1cd0 drivers/net/tun.c:1119 Read of size 8 at addr ffff8801d7356888 by task syz-executor3/4560 CPU: 0 PID: 4560 Comm: syz-executor3 Not tainted 4.18.0-rc3+ #8 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+0x1c9/0x2b4 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 __ptr_ring_produce include/linux/ptr_ring.h:110 [inline] ptr_ring_produce include/linux/ptr_ring.h:133 [inline] tun_net_xmit+0x1b28/0x1cd0 drivers/net/tun.c:1119 __netdev_start_xmit include/linux/netdevice.h:4148 [inline] netdev_start_xmit include/linux/netdevice.h:4157 [inline] xmit_one net/core/dev.c:3034 [inline] dev_hard_start_xmit+0x26c/0xc30 net/core/dev.c:3050 sch_direct_xmit+0x486/0x1140 net/sched/sch_generic.c:327 qdisc_restart net/sched/sch_generic.c:390 [inline] __qdisc_run+0x619/0x19f0 net/sched/sch_generic.c:398 qdisc_run include/net/pkt_sched.h:118 [inline] __dev_xmit_skb net/core/dev.c:3229 [inline] __dev_queue_xmit+0x13ec/0x38e0 net/core/dev.c:3537 dev_queue_xmit+0x17/0x20 net/core/dev.c:3602 neigh_hh_output include/net/neighbour.h:473 [inline] neigh_output include/net/neighbour.h:481 [inline] ip6_finish_output2+0x135a/0x2820 net/ipv6/ip6_output.c:120 ip6_finish_output+0x5fe/0xbc0 net/ipv6/ip6_output.c:154 NF_HOOK_COND include/linux/netfilter.h:276 [inline] ip6_output+0x234/0x9d0 net/ipv6/ip6_output.c:171 dst_output include/net/dst.h:444 [inline] NF_HOOK include/linux/netfilter.h:287 [inline] mld_sendpack+0xaeb/0xfc0 net/ipv6/mcast.c:1658 mld_send_cr net/ipv6/mcast.c:1954 [inline] mld_ifc_timer_expire+0x447/0x8a0 net/ipv6/mcast.c:2453 call_timer_fn+0x242/0x970 kernel/time/timer.c:1326 expire_timers kernel/time/timer.c:1363 [inline] __run_timers+0x7a6/0xc70 kernel/time/timer.c:1666 run_timer_softirq+0x4c/0x70 kernel/time/timer.c:1692 __do_softirq+0x2e8/0xb17 kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x1d1/0x200 kernel/softirq.c:408 exiting_irq arch/x86/include/asm/apic.h:527 [inline] smp_apic_timer_interrupt+0x186/0x730 arch/x86/kernel/apic/apic.c:1052 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:863 RIP: 0010:__mark_inode_dirty+0x719/0x1550 fs/fs-writeback.c:2147 Code: 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 d5 09 00 00 8b 05 f7 17 d4 08 <48> 8d 8b 88 00 00 00 31 ff 49 89 ce 89 c6 89 85 a0 fd ff ff e8 de RSP: 0018:ffff8801a2887930 EFLAGS: 00000297 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: ffff88019f664b60 RCX: ffffffff81d170cb RDX: 0000000000000004 RSI: ffffffff81d175b2 RDI: ffffffff8aa58de0 RBP: ffff8801a2887b98 R08: ffff8801a287e000 R09: ffffed003b5c46d6 R10: ffffed003b5c46d6 R11: ffff8801dae236b3 R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000000 R15: ffff88019f664c38 generic_update_time+0x26a/0x450 fs/inode.c:1643 update_time fs/inode.c:1659 [inline] touch_atime+0x29e/0x320 fs/inode.c:1731 file_accessed include/linux/fs.h:2082 [inline] iterate_dir+0x394/0x5d0 fs/readdir.c:56 __do_sys_getdents fs/readdir.c:231 [inline] __se_sys_getdents fs/readdir.c:212 [inline] __x64_sys_getdents+0x29f/0x510 fs/readdir.c:212 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x453fbb Code: 02 74 b6 31 f6 eb b9 0f 1f 84 00 00 00 00 00 41 57 41 56 48 63 ff 41 55 41 54 b8 4e 00 00 00 55 53 48 89 f3 48 83 ec 08 0f 05 <48> 3d 00 f0 ff ff 77 55 4c 8d 24 06 49 89 c5 4c 39 e6 73 33 90 0f RSP: 002b:0000000000a3d980 EFLAGS: 00000202 ORIG_RAX: 000000000000004e RAX: ffffffffffffffda RBX: 0000000001bfc970 RCX: 0000000000453fbb RDX: 0000000000008000 RSI: 0000000001bfc970 RDI: 0000000000000013 RBP: 0000000001bfc970 R08: 0000000000000001 R09: 0000000001bfb940 R10: 0000000000000000 R11: 0000000000000202 R12: ffffffffffffffd4 R13: 0000000000000016 R14: 0000000000a3f160 R15: 0000000000702140 Allocated by task 12926: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 __do_kmalloc_node mm/slab.c:3682 [inline] __kmalloc_node+0x47/0x70 mm/slab.c:3689 kmalloc_node include/linux/slab.h:555 [inline] kvmalloc_node+0x65/0xf0 mm/util.c:423 kvmalloc include/linux/mm.h:557 [inline] kvmalloc_array include/linux/mm.h:575 [inline] __ptr_ring_init_queue_alloc include/linux/ptr_ring.h:475 [inline] ptr_ring_resize_multiple include/linux/ptr_ring.h:635 [inline] tun_queue_resize drivers/net/tun.c:3444 [inline] tun_device_event+0x567/0x1030 drivers/net/tun.c:3463 notifier_call_chain+0x180/0x390 kernel/notifier.c:93 __raw_notifier_call_chain kernel/notifier.c:394 [inline] raw_notifier_call_chain+0x2d/0x40 kernel/notifier.c:401 call_netdevice_notifiers_info+0x3f/0x90 net/core/dev.c:1735 call_netdevice_notifiers net/core/dev.c:1753 [inline] dev_change_tx_queue_len+0x192/0x270 net/core/dev.c:7150 do_setlink+0xccb/0x3e10 net/core/rtnetlink.c:2398 rtnl_group_changelink net/core/rtnetlink.c:2834 [inline] rtnl_newlink+0x159a/0x1d60 net/core/rtnetlink.c:2992 rtnetlink_rcv_msg+0x46e/0xc30 net/core/rtnetlink.c:4662 netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2448 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:4680 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] netlink_unicast+0x5a0/0x760 net/netlink/af_netlink.c:1336 netlink_sendmsg+0xa18/0xfd0 net/netlink/af_netlink.c:1901 sock_sendmsg_nosec net/socket.c:641 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:651 ___sys_sendmsg+0x7fd/0x930 net/socket.c:2125 __sys_sendmsg+0x11d/0x290 net/socket.c:2163 __do_sys_sendmsg net/socket.c:2172 [inline] __se_sys_sendmsg net/socket.c:2170 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2170 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 2418: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x260 mm/slab.c:3813 kernfs_fop_write+0x18c/0x480 fs/kernfs/file.c:330 __vfs_write+0x117/0x9f0 fs/read_write.c:485 vfs_write+0x1f8/0x560 fs/read_write.c:549 ksys_write+0x101/0x260 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8801d7356880 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 8 bytes inside of 32-byte region [ffff8801d7356880, ffff8801d73568a0) The buggy address belongs to the page: page:ffffea00075cd580 count:1 mapcount:0 mapping:ffff8801da8001c0 index:0xffff8801d7356fc1 flags: 0x2fffc0000000100(slab) raw: 02fffc0000000100 ffffea00075b4b08 ffffea0007510888 ffff8801da8001c0 raw: ffff8801d7356fc1 ffff8801d7356000 0000000100000037 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801d7356780: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff8801d7356800: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc >ffff8801d7356880: 00 fc fc fc fc fc fc fc 00 00 00 fc fc fc fc fc ^ ffff8801d7356900: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ffff8801d7356980: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ==================================================================