================================================================== BUG: KASAN: slab-use-after-free in taprio_dump_tc_entries net/sched/sch_taprio.c:2306 [inline] BUG: KASAN: slab-use-after-free in taprio_dump+0xb88/0xca0 net/sched/sch_taprio.c:2420 Read of size 4 at addr ffff88807b5530ec by task syz-executor787/6477 CPU: 1 PID: 6477 Comm: syz-executor787 Not tainted 6.8.0-rc2-syzkaller-00031-g861c0981648f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc4/0x620 mm/kasan/report.c:488 kasan_report+0xda/0x110 mm/kasan/report.c:601 taprio_dump_tc_entries net/sched/sch_taprio.c:2306 [inline] taprio_dump+0xb88/0xca0 net/sched/sch_taprio.c:2420 tc_fill_qdisc+0x62d/0x12e0 net/sched/sch_api.c:952 qdisc_notify.isra.0+0x367/0x3f0 net/sched/sch_api.c:1053 tc_modify_qdisc+0x914/0x1c30 net/sched/sch_api.c:1748 rtnetlink_rcv_msg+0x3c7/0xe00 net/core/rtnetlink.c:6615 netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2543 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline] netlink_unicast+0x53b/0x810 net/netlink/af_netlink.c:1367 netlink_sendmsg+0x8b7/0xd70 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0xd5/0x180 net/socket.c:745 ____sys_sendmsg+0x6ac/0x940 net/socket.c:2584 ___sys_sendmsg+0x135/0x1d0 net/socket.c:2638 __sys_sendmsg+0x117/0x1e0 net/socket.c:2667 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f421bd9ed29 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 01 1a 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe5eecd3a8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f421bd9ed29 RDX: 0000000000000000 RSI: 00000000200007c0 RDI: 0000000000000004 RBP: 0000000000000000 R08: 00007f421bdec1fa R09: 00007f421bdec1fa R10: 00007f421bdec1fa R11: 0000000000000246 R12: 00007ffe5eecd3cc R13: 00007ffe5eecd400 R14: 00007ffe5eecd3e0 R15: 000000000000010e Allocated by task 6471: kasan_save_stack+0x33/0x50 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:372 [inline] __kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:389 kmalloc include/linux/slab.h:590 [inline] kzalloc include/linux/slab.h:711 [inline] taprio_change+0x55a/0x38d0 net/sched/sch_taprio.c:1881 qdisc_change net/sched/sch_api.c:1416 [inline] tc_modify_qdisc+0x7d5/0x1c30 net/sched/sch_api.c:1746 rtnetlink_rcv_msg+0x3c7/0xe00 net/core/rtnetlink.c:6615 netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2543 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline] netlink_unicast+0x53b/0x810 net/netlink/af_netlink.c:1367 netlink_sendmsg+0x8b7/0xd70 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0xd5/0x180 net/socket.c:745 ____sys_sendmsg+0x6ac/0x940 net/socket.c:2584 ___sys_sendmsg+0x135/0x1d0 net/socket.c:2638 __sys_sendmsg+0x117/0x1e0 net/socket.c:2667 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Freed by task 5092: kasan_save_stack+0x33/0x50 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3f/0x60 mm/kasan/generic.c:640 poison_slab_object mm/kasan/common.c:241 [inline] __kasan_slab_free+0x121/0x1b0 mm/kasan/common.c:257 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2121 [inline] slab_free mm/slub.c:4299 [inline] kfree+0x124/0x360 mm/slub.c:4409 rcu_do_batch kernel/rcu/tree.c:2190 [inline] rcu_core+0x819/0x1680 kernel/rcu/tree.c:2465 __do_softirq+0x21a/0x8de kernel/softirq.c:553 Last potentially related work creation: kasan_save_stack+0x33/0x50 mm/kasan/common.c:47 __kasan_record_aux_stack+0xba/0x100 mm/kasan/generic.c:586 __call_rcu_common.constprop.0+0x9a/0x7b0 kernel/rcu/tree.c:2715 switch_schedules net/sched/sch_taprio.c:210 [inline] advance_sched+0x5a1/0xc60 net/sched/sch_taprio.c:984 __run_hrtimer kernel/time/hrtimer.c:1688 [inline] __hrtimer_run_queues+0x203/0xc20 kernel/time/hrtimer.c:1752 hrtimer_interrupt+0x31b/0x800 kernel/time/hrtimer.c:1814 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1065 [inline] __sysvec_apic_timer_interrupt+0x105/0x400 arch/x86/kernel/apic/apic.c:1082 sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1076 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649 The buggy address belongs to the object at ffff88807b553000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 236 bytes inside of freed 512-byte region [ffff88807b553000, ffff88807b553200) The buggy address belongs to the physical page: page:ffffea0001ed5400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7b550 head:ffffea0001ed5400 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888013041c80 ffffea0001fb4900 dead000000000002 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5116, tgid 5116 (kworker/0:1), ts 532628356818, free_ts 532535432627 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2d0/0x350 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3311 __alloc_pages+0x22f/0x2440 mm/page_alloc.c:4567 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page mm/slub.c:2190 [inline] allocate_slab mm/slub.c:2354 [inline] new_slab+0xcc/0x3a0 mm/slub.c:2407 ___slab_alloc+0x4af/0x19a0 mm/slub.c:3540 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3625 __slab_alloc_node mm/slub.c:3678 [inline] slab_alloc_node mm/slub.c:3850 [inline] __do_kmalloc_node mm/slub.c:3980 [inline] __kmalloc+0x3b4/0x440 mm/slub.c:3994 kmalloc include/linux/slab.h:594 [inline] kzalloc include/linux/slab.h:711 [inline] fib6_info_alloc+0x40/0x100 net/ipv6/ip6_fib.c:155 ip6_route_info_create+0x337/0x1b70 net/ipv6/route.c:3749 ip6_route_add+0x26/0x150 net/ipv6/route.c:3843 addrconf_prefix_route+0x2fe/0x510 net/ipv6/addrconf.c:2437 addrconf_add_linklocal+0x31d/0x640 net/ipv6/addrconf.c:3258 addrconf_addr_gen+0x36b/0x3c0 net/ipv6/addrconf.c:3387 addrconf_dev_config net/ipv6/addrconf.c:3432 [inline] addrconf_init_auto_addrs+0x446/0x820 net/ipv6/addrconf.c:3510 addrconf_notify+0x6e2/0x18f0 net/ipv6/addrconf.c:3683 notifier_call_chain+0xb6/0x3b0 kernel/notifier.c:93 page last free pid 5116 tgid 5116 stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1140 [inline] free_unref_page_prepare+0x51f/0xb10 mm/page_alloc.c:2346 free_unref_page+0x33/0x3c0 mm/page_alloc.c:2486 __put_partials+0x14c/0x160 mm/slub.c:2922 qlink_free mm/kasan/quarantine.c:160 [inline] qlist_free_all+0x58/0x150 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x18e/0x1d0 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x65/0x90 mm/kasan/common.c:324 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3813 [inline] slab_alloc_node mm/slub.c:3860 [inline] kmem_cache_alloc_node+0x177/0x340 mm/slub.c:3903 __alloc_skb+0x287/0x330 net/core/skbuff.c:641 alloc_skb include/linux/skbuff.h:1296 [inline] alloc_skb_with_frags+0xe4/0x710 net/core/skbuff.c:6394 sock_alloc_send_pskb+0x7e4/0x970 net/core/sock.c:2784 sock_alloc_send_skb include/net/sock.h:1855 [inline] mld_newpack.isra.0+0x1ed/0x790 net/ipv6/mcast.c:1746 add_grhead+0x295/0x340 net/ipv6/mcast.c:1849 add_grec+0x111a/0x1670 net/ipv6/mcast.c:1987 mld_send_initial_cr.part.0+0xe2/0x260 net/ipv6/mcast.c:2233 mld_send_initial_cr net/ipv6/mcast.c:2224 [inline] mld_dad_work+0x57/0x2e0 net/ipv6/mcast.c:2259 process_one_work+0x886/0x15d0 kernel/workqueue.c:2633 Memory state around the buggy address: ffff88807b552f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807b553000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807b553080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807b553100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807b553180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================