syzbot

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BUG: KASAN: use-after-free in ieee80211_scan_rx+0x7d0/0x7e0 net/mac80211/scan.c:289
Read of size 4 at addr ffff88807b45902c by task ksoftirqd/1/19

CPU: 1 PID: 19 Comm: ksoftirqd/1 Not tainted 5.15.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_address_description.constprop.0.cold+0x6c/0x2d6 mm/kasan/report.c:256
 __kasan_report mm/kasan/report.c:442 [inline]
 kasan_report.cold+0x83/0xdf mm/kasan/report.c:459
 ieee80211_scan_rx+0x7d0/0x7e0 net/mac80211/scan.c:289
 __ieee80211_rx_handle_packet net/mac80211/rx.c:4786 [inline]
 ieee80211_rx_list+0x20fc/0x27d0 net/mac80211/rx.c:4978
 ieee80211_rx_napi+0xdb/0x3d0 net/mac80211/rx.c:5001
 ieee80211_rx include/net/mac80211.h:4571 [inline]
 ieee80211_tasklet_handler+0xd4/0x130 net/mac80211/main.c:235
 tasklet_action_common.constprop.0+0x201/0x2e0 kernel/softirq.c:783
 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558
 run_ksoftirqd kernel/softirq.c:920 [inline]
 run_ksoftirqd+0x2d/0x60 kernel/softirq.c:912
 smpboot_thread_fn+0x645/0x9c0 kernel/smpboot.c:164
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

Allocated by task 29606:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 ____kasan_kmalloc mm/kasan/common.c:513 [inline]
 ____kasan_kmalloc mm/kasan/common.c:472 [inline]
 __kasan_kmalloc+0xa1/0xd0 mm/kasan/common.c:522
 kasan_kmalloc include/linux/kasan.h:264 [inline]
 __do_kmalloc mm/slab.c:3702 [inline]
 __kmalloc+0x214/0x4d0 mm/slab.c:3711
 kmalloc include/linux/slab.h:596 [inline]
 kzalloc include/linux/slab.h:721 [inline]
 cfg80211_conn_scan+0x195/0xfe0 net/wireless/sme.c:80
 cfg80211_sme_connect net/wireless/sme.c:585 [inline]
 cfg80211_connect+0x15d0/0x2010 net/wireless/sme.c:1257
 nl80211_connect+0x1647/0x22a0 net/wireless/nl80211.c:10927
 genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:731
 genl_family_rcv_msg net/netlink/genetlink.c:775 [inline]
 genl_rcv_msg+0x328/0x580 net/netlink/genetlink.c:792
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:803
 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340
 netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:724
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2409
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2463
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2492
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Freed by task 26843:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360
 ____kasan_slab_free mm/kasan/common.c:366 [inline]
 ____kasan_slab_free mm/kasan/common.c:328 [inline]
 __kasan_slab_free+0xd1/0x110 mm/kasan/common.c:374
 kasan_slab_free include/linux/kasan.h:230 [inline]
 __cache_free mm/slab.c:3445 [inline]
 kfree+0x10a/0x2c0 mm/slab.c:3803
 ___cfg80211_scan_done+0x474/0x960 net/wireless/scan.c:983
 __cfg80211_scan_done+0x2c/0x40 net/wireless/scan.c:1000
 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

Last potentially related work creation:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_record_aux_stack+0xa7/0xd0 mm/kasan/generic.c:348
 kvfree_call_rcu+0x74/0x990 kernel/rcu/tree.c:3552
 drop_sysctl_table+0x3c0/0x4e0 fs/proc/proc_sysctl.c:1647
 unregister_sysctl_table fs/proc/proc_sysctl.c:1685 [inline]
 unregister_sysctl_table+0xc2/0x190 fs/proc/proc_sysctl.c:1660
 mpls_dev_sysctl_unregister net/mpls/af_mpls.c:1441 [inline]
 mpls_dev_notify+0x44e/0x8e0 net/mpls/af_mpls.c:1621
 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1996
 call_netdevice_notifiers_extack net/core/dev.c:2008 [inline]
 call_netdevice_notifiers net/core/dev.c:2022 [inline]
 unregister_netdevice_many+0x951/0x1790 net/core/dev.c:11043
 default_device_exit_batch+0x2fa/0x3c0 net/core/dev.c:11573
 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:171
 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:591
 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

Second to last potentially related work creation:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_record_aux_stack+0xa7/0xd0 mm/kasan/generic.c:348
 __call_rcu kernel/rcu/tree.c:2987 [inline]
 call_rcu+0xb1/0x750 kernel/rcu/tree.c:3067
 fib6_info_release include/net/ip6_fib.h:337 [inline]
 fib6_info_release include/net/ip6_fib.h:334 [inline]
 __ip6_del_rt net/ipv6/route.c:3875 [inline]
 ip6_del_rt+0x1be/0x200 net/ipv6/route.c:3886
 __ipv6_ifa_notify+0x4f3/0xa90 net/ipv6/addrconf.c:6135
 addrconf_ifdown.isra.0+0xa4b/0x1630 net/ipv6/addrconf.c:3835
 addrconf_notify+0xeb/0x1bb0 net/ipv6/addrconf.c:3646
 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1996
 call_netdevice_notifiers_extack net/core/dev.c:2008 [inline]
 call_netdevice_notifiers net/core/dev.c:2022 [inline]
 dev_close_many+0x2ff/0x620 net/core/dev.c:1597
 unregister_netdevice_many+0x3ff/0x1790 net/core/dev.c:11020
 ip_tunnel_delete_nets+0x39f/0x5b0 net/ipv4/ip_tunnel.c:1123
 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:171
 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:591
 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

The buggy address belongs to the object at ffff88807b459000
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 44 bytes inside of
 256-byte region [ffff88807b459000, ffff88807b459100)
The buggy address belongs to the page:
page:ffffea0001ed1640 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7b459
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffffea0001b3ed48 ffffea0001e0e948 ffff888010c40500
raw: 0000000000000000 ffff88807b459000 0000000100000008 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 0x2420c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_COMP|__GFP_THISNODE), pid 11140, ts 716977148092, free_ts 706624018723
 prep_new_page mm/page_alloc.c:2424 [inline]
 get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4153
 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5375
 __alloc_pages_node include/linux/gfp.h:570 [inline]
 kmem_getpages mm/slab.c:1377 [inline]
 cache_grow_begin+0x75/0x460 mm/slab.c:2593
 cache_alloc_refill+0x27f/0x380 mm/slab.c:2965
 ____cache_alloc mm/slab.c:3048 [inline]
 ____cache_alloc mm/slab.c:3031 [inline]
 __do_cache_alloc mm/slab.c:3275 [inline]
 slab_alloc mm/slab.c:3316 [inline]
 __do_kmalloc mm/slab.c:3700 [inline]
 __kmalloc+0x3d5/0x4d0 mm/slab.c:3711
 kmalloc include/linux/slab.h:596 [inline]
 kzalloc include/linux/slab.h:721 [inline]
 ieee80211_ibss_build_presp+0x135/0x1760 net/mac80211/ibss.c:70
 __ieee80211_sta_join_ibss+0x67b/0x1590 net/mac80211/ibss.c:317
 ieee80211_sta_create_ibss.cold+0xd2/0x11f net/mac80211/ibss.c:1347
 ieee80211_sta_find_ibss net/mac80211/ibss.c:1477 [inline]
 ieee80211_ibss_work.cold+0x30e/0x60f net/mac80211/ibss.c:1701
 ieee80211_iface_work+0xb70/0xd00 net/mac80211/iface.c:1515
 process_one_work+0x9bf/0x16b0 kernel/workqueue.c:2297
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444
 kthread+0x3e5/0x4d0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1338 [inline]
 free_pcp_prepare+0x2c5/0x780 mm/page_alloc.c:1389
 free_unref_page_prepare mm/page_alloc.c:3315 [inline]
 free_unref_page+0x19/0x690 mm/page_alloc.c:3394
 slab_destroy mm/slab.c:1627 [inline]
 slabs_destroy+0x89/0xc0 mm/slab.c:1647
 cache_flusharray mm/slab.c:3418 [inline]
 ___cache_free+0x4c6/0x610 mm/slab.c:3480
 qlink_free mm/kasan/quarantine.c:146 [inline]
 qlist_free_all+0x4e/0x110 mm/kasan/quarantine.c:165
 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272
 __kasan_slab_alloc+0x92/0xa0 mm/kasan/common.c:444
 kasan_slab_alloc include/linux/kasan.h:254 [inline]
 slab_post_alloc_hook mm/slab.h:519 [inline]
 slab_alloc mm/slab.c:3323 [inline]
 kmem_cache_alloc_trace+0x256/0x480 mm/slab.c:3573
 kmalloc include/linux/slab.h:591 [inline]
 kzalloc include/linux/slab.h:721 [inline]
 mld_add_delrec net/ipv6/mcast.c:742 [inline]
 igmp6_leave_group net/ipv6/mcast.c:2633 [inline]
 igmp6_group_dropped+0x4f7/0xeb0 net/ipv6/mcast.c:722
 __ipv6_dev_mc_dec+0x25e/0x340 net/ipv6/mcast.c:978
 addrconf_leave_solict net/ipv6/addrconf.c:2189 [inline]
 addrconf_leave_solict net/ipv6/addrconf.c:2181 [inline]
 __ipv6_ifa_notify+0x5b6/0xa90 net/ipv6/addrconf.c:6124
 addrconf_ifdown.isra.0+0xa4b/0x1630 net/ipv6/addrconf.c:3835
 addrconf_notify+0xeb/0x1bb0 net/ipv6/addrconf.c:3646
 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1996
 call_netdevice_notifiers_extack net/core/dev.c:2008 [inline]
 call_netdevice_notifiers net/core/dev.c:2022 [inline]
 dev_close_many+0x2ff/0x620 net/core/dev.c:1597

Memory state around the buggy address:
 ffff88807b458f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88807b458f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88807b459000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff88807b459080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88807b459100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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