================================================================== BUG: KASAN: use-after-free in dump_schedule+0x758/0x7d0 net/sched/sch_taprio.c:1918 Read of size 8 at addr ffff88802086ea40 by task syz-executor.2/6706 CPU: 0 PID: 6706 Comm: syz-executor.2 Not tainted 6.1.0-rc8-syzkaller-00212-g76dcd734eca2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15e/0x461 mm/kasan/report.c:395 kasan_report+0xbf/0x1f0 mm/kasan/report.c:495 dump_schedule+0x758/0x7d0 net/sched/sch_taprio.c:1918 taprio_dump+0x740/0xd80 net/sched/sch_taprio.c:2016 tc_fill_qdisc+0x5f9/0x11e0 net/sched/sch_api.c:942 qdisc_notify.isra.0+0x2b6/0x320 net/sched/sch_api.c:1008 tc_modify_qdisc+0xf48/0x19a0 net/sched/sch_api.c:1645 rtnetlink_rcv_msg+0x43e/0xca0 net/core/rtnetlink.c:6091 netlink_rcv_skb+0x157/0x430 net/netlink/af_netlink.c:2540 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x91b/0xe10 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xd3/0x120 net/socket.c:734 sock_no_sendpage+0x10c/0x160 net/core/sock.c:3219 kernel_sendpage.part.0+0x1d5/0x700 net/socket.c:3561 kernel_sendpage net/socket.c:3558 [inline] sock_sendpage+0xe3/0x140 net/socket.c:1054 pipe_to_sendpage+0x2b1/0x380 fs/splice.c:361 splice_from_pipe_feed fs/splice.c:415 [inline] __splice_from_pipe+0x449/0x8a0 fs/splice.c:559 splice_from_pipe fs/splice.c:594 [inline] generic_splice_sendpage+0xd8/0x140 fs/splice.c:743 do_splice_from fs/splice.c:764 [inline] do_splice+0xb5b/0x1930 fs/splice.c:1074 __do_splice+0x134/0x250 fs/splice.c:1139 __do_sys_splice fs/splice.c:1346 [inline] __se_sys_splice fs/splice.c:1328 [inline] __x64_sys_splice+0x19c/0x250 fs/splice.c:1328 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f7a49488a39 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f7a4a620188 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 00007f7a4958bf60 RCX: 00007f7a49488a39 RDX: 0000000000000004 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007f7a494e2c5f R08: 0000000000010976 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd54b0d9af R14: 00007f7a4a620300 R15: 0000000000022000 Allocated by task 6687: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] ____kasan_kmalloc mm/kasan/common.c:330 [inline] __kasan_kmalloc+0xa3/0xb0 mm/kasan/common.c:380 kmalloc include/linux/slab.h:553 [inline] kzalloc include/linux/slab.h:689 [inline] taprio_change+0x759/0x4010 net/sched/sch_taprio.c:1568 qdisc_change net/sched/sch_api.c:1348 [inline] tc_modify_qdisc+0xdc3/0x19a0 net/sched/sch_api.c:1643 rtnetlink_rcv_msg+0x43e/0xca0 net/core/rtnetlink.c:6091 netlink_rcv_skb+0x157/0x430 net/netlink/af_netlink.c:2540 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x91b/0xe10 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xd3/0x120 net/socket.c:734 sock_no_sendpage+0x10c/0x160 net/core/sock.c:3219 kernel_sendpage.part.0+0x1d5/0x700 net/socket.c:3561 kernel_sendpage net/socket.c:3558 [inline] sock_sendpage+0xe3/0x140 net/socket.c:1054 pipe_to_sendpage+0x2b1/0x380 fs/splice.c:361 splice_from_pipe_feed fs/splice.c:415 [inline] __splice_from_pipe+0x449/0x8a0 fs/splice.c:559 splice_from_pipe fs/splice.c:594 [inline] generic_splice_sendpage+0xd8/0x140 fs/splice.c:743 do_splice_from fs/splice.c:764 [inline] do_splice+0xb5b/0x1930 fs/splice.c:1074 __do_splice+0x134/0x250 fs/splice.c:1139 __do_sys_splice fs/splice.c:1346 [inline] __se_sys_splice fs/splice.c:1328 [inline] __x64_sys_splice+0x19c/0x250 fs/splice.c:1328 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 14: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:511 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x13b/0x1a0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:177 [inline] __cache_free mm/slab.c:3389 [inline] __do_kmem_cache_free mm/slab.c:3585 [inline] __kmem_cache_free+0xcd/0x3b0 mm/slab.c:3592 rcu_do_batch kernel/rcu/tree.c:2250 [inline] rcu_core+0x81f/0x1980 kernel/rcu/tree.c:2510 __do_softirq+0x1fb/0xadc kernel/softirq.c:571 Last potentially related work creation: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0x7b/0x90 mm/kasan/generic.c:481 call_rcu+0x9d/0x820 kernel/rcu/tree.c:2798 taprio_change+0x2ecc/0x4010 net/sched/sch_taprio.c:1675 qdisc_change net/sched/sch_api.c:1348 [inline] tc_modify_qdisc+0xdc3/0x19a0 net/sched/sch_api.c:1643 rtnetlink_rcv_msg+0x43e/0xca0 net/core/rtnetlink.c:6091 netlink_rcv_skb+0x157/0x430 net/netlink/af_netlink.c:2540 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x91b/0xe10 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xd3/0x120 net/socket.c:734 sock_no_sendpage+0x10c/0x160 net/core/sock.c:3219 kernel_sendpage.part.0+0x1d5/0x700 net/socket.c:3561 kernel_sendpage net/socket.c:3558 [inline] sock_sendpage+0xe3/0x140 net/socket.c:1054 pipe_to_sendpage+0x2b1/0x380 fs/splice.c:361 splice_from_pipe_feed fs/splice.c:415 [inline] __splice_from_pipe+0x449/0x8a0 fs/splice.c:559 splice_from_pipe fs/splice.c:594 [inline] generic_splice_sendpage+0xd8/0x140 fs/splice.c:743 do_splice_from fs/splice.c:764 [inline] do_splice+0xb5b/0x1930 fs/splice.c:1074 __do_splice+0x134/0x250 fs/splice.c:1139 __do_sys_splice fs/splice.c:1346 [inline] __se_sys_splice fs/splice.c:1328 [inline] __x64_sys_splice+0x19c/0x250 fs/splice.c:1328 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Second to last potentially related work creation: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0x7b/0x90 mm/kasan/generic.c:481 kvfree_call_rcu+0x78/0x8f0 kernel/rcu/tree.c:3343 cfg80211_update_known_bss+0x827/0xa70 net/wireless/scan.c:1683 cfg80211_bss_update+0xf3/0x21d0 net/wireless/scan.c:1730 cfg80211_inform_single_bss_frame_data+0x761/0xfc0 net/wireless/scan.c:2499 cfg80211_inform_bss_frame_data+0xc3/0xc80 net/wireless/scan.c:2532 ieee80211_bss_info_update+0x35c/0xaf0 net/mac80211/scan.c:190 ieee80211_rx_bss_info net/mac80211/ibss.c:1120 [inline] ieee80211_rx_mgmt_probe_beacon net/mac80211/ibss.c:1609 [inline] ieee80211_ibss_rx_queued_mgmt+0x1a32/0x3190 net/mac80211/ibss.c:1638 ieee80211_iface_process_skb net/mac80211/iface.c:1630 [inline] ieee80211_iface_work+0xa4b/0xd30 net/mac80211/iface.c:1684 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x669/0x1090 kernel/workqueue.c:2436 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 The buggy address belongs to the object at ffff88802086ea00 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 64 bytes inside of 96-byte region [ffff88802086ea00, ffff88802086ea60) The buggy address belongs to the physical page: page:ffffea0000821b80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2086e flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea0001f74c48 ffffea00009fb688 ffff888012040300 raw: 0000000000000000 ffff88802086e000 0000000100000020 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x342220(__GFP_HIGH|__GFP_ATOMIC|__GFP_NOWARN|__GFP_COMP|__GFP_HARDWALL|__GFP_THISNODE), pid 4204, tgid 4204 (kworker/0:7), ts 101465451350, free_ts 101438077712 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x10b5/0x2d50 mm/page_alloc.c:4291 __alloc_pages+0x1cb/0x5b0 mm/page_alloc.c:5558 __alloc_pages_node include/linux/gfp.h:237 [inline] kmem_getpages mm/slab.c:1363 [inline] cache_grow_begin+0x94/0x390 mm/slab.c:2570 cache_alloc_refill+0x27f/0x380 mm/slab.c:2943 ____cache_alloc mm/slab.c:3019 [inline] ____cache_alloc mm/slab.c:3002 [inline] __do_cache_alloc mm/slab.c:3202 [inline] slab_alloc_node mm/slab.c:3250 [inline] __kmem_cache_alloc_node+0x44a/0x510 mm/slab.c:3549 kmalloc_trace+0x26/0x60 mm/slab_common.c:1045 kmalloc include/linux/slab.h:553 [inline] kzalloc include/linux/slab.h:689 [inline] nsim_fib_event_schedule_work drivers/net/netdevsim/fib.c:990 [inline] nsim_fib_event_nb+0x1ba/0xe30 drivers/net/netdevsim/fib.c:1043 notifier_call_chain+0xb5/0x200 kernel/notifier.c:87 atomic_notifier_call_chain+0x74/0x180 kernel/notifier.c:225 call_fib_notifiers+0x11d/0x2a0 net/core/fib_notifier.c:35 call_fib6_entry_notifiers net/ipv6/ip6_fib.c:402 [inline] fib6_add_rt2node net/ipv6/ip6_fib.c:1224 [inline] fib6_add+0xe25/0x3f20 net/ipv6/ip6_fib.c:1478 __ip6_ins_rt net/ipv6/route.c:1302 [inline] ip6_ins_rt+0xb6/0x110 net/ipv6/route.c:1312 __ipv6_ifa_notify+0x8c7/0xb60 net/ipv6/addrconf.c:6157 ipv6_ifa_notify net/ipv6/addrconf.c:6196 [inline] addrconf_dad_completed+0x133/0xd80 net/ipv6/addrconf.c:4209 addrconf_dad_work+0x75d/0x12d0 net/ipv6/addrconf.c:4157 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1459 [inline] free_pcp_prepare+0x65c/0xd90 mm/page_alloc.c:1509 free_unref_page_prepare mm/page_alloc.c:3387 [inline] free_unref_page+0x1d/0x4d0 mm/page_alloc.c:3483 slab_destroy mm/slab.c:1615 [inline] slabs_destroy+0x85/0xc0 mm/slab.c:1635 cache_flusharray mm/slab.c:3360 [inline] ___cache_free+0x2ac/0x3d0 mm/slab.c:3423 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x4f/0x1a0 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x184/0x210 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x63/0x90 mm/kasan/common.c:302 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slab.h:737 [inline] slab_alloc_node mm/slab.c:3257 [inline] kmem_cache_alloc_node+0x28f/0x580 mm/slab.c:3537 __alloc_skb+0x214/0x300 net/core/skbuff.c:497 alloc_skb include/linux/skbuff.h:1267 [inline] alloc_skb_with_frags+0x97/0x6c0 net/core/skbuff.c:6126 sock_alloc_send_pskb+0x7a7/0x930 net/core/sock.c:2719 sock_alloc_send_skb include/net/sock.h:1884 [inline] mld_newpack.isra.0+0x1b9/0x770 net/ipv6/mcast.c:1748 add_grhead+0x295/0x340 net/ipv6/mcast.c:1851 add_grec+0x1082/0x1560 net/ipv6/mcast.c:1989 mld_send_initial_cr.part.0+0xf6/0x230 net/ipv6/mcast.c:2236 mld_send_initial_cr net/ipv6/mcast.c:1232 [inline] ipv6_mc_dad_complete+0x1d4/0x690 net/ipv6/mcast.c:2247 Memory state around the buggy address: ffff88802086e900: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff88802086e980: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc >ffff88802086ea00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff88802086ea80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff88802086eb00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ==================================================================