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BUG: KASAN: use-after-free in kill_pending_fw_fallback_reqs+0x2fb/0x370 drivers/base/firmware_loader/fallback.c:116
Read of size 8 at addr ffff88806ff8f0c0 by task syz-executor.3/7390

CPU: 1 PID: 7390 Comm: syz-executor.3 Not tainted 5.14.0-rc4-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:105
 print_address_description.constprop.0.cold+0x6c/0x2d6 mm/kasan/report.c:233
 __kasan_report mm/kasan/report.c:419 [inline]
 kasan_report.cold+0x83/0xdf mm/kasan/report.c:436
 kill_pending_fw_fallback_reqs+0x2fb/0x370 drivers/base/firmware_loader/fallback.c:116
 fw_pm_notify+0xa2/0x140 drivers/base/firmware_loader/main.c:1450
 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
 notifier_call_chain_robust kernel/notifier.c:118 [inline]
 blocking_notifier_call_chain_robust kernel/notifier.c:302 [inline]
 blocking_notifier_call_chain_robust+0xc4/0x160 kernel/notifier.c:290
 pm_notifier_call_chain_robust+0x26/0x60 kernel/power/main.c:87
 snapshot_open+0x190/0x2a0 kernel/power/user.c:75
 misc_open+0x372/0x4a0 drivers/char/misc.c:141
 chrdev_open+0x266/0x770 fs/char_dev.c:414
 do_dentry_open+0x4c8/0x11d0 fs/open.c:826
 do_open fs/namei.c:3374 [inline]
 path_openat+0x1c23/0x27f0 fs/namei.c:3507
 do_filp_open+0x1aa/0x400 fs/namei.c:3534
 do_sys_openat2+0x16d/0x420 fs/open.c:1204
 do_sys_open fs/open.c:1220 [inline]
 __do_sys_openat fs/open.c:1236 [inline]
 __se_sys_openat fs/open.c:1231 [inline]
 __x64_sys_openat+0x13f/0x1f0 fs/open.c:1231
 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
RIP: 0033:0x4665e9
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:00007f4c5b6a0188 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9
RDX: 0000000000000000 RSI: 0000000020000000 RDI: ffffffffffffff9c
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffeca276dcf R14: 00007f4c5b6a0300 R15: 0000000000022000

Allocated by task 4359:
 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+0x98/0xc0 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]
 new_dir fs/proc/proc_sysctl.c:953 [inline]
 get_subdir fs/proc/proc_sysctl.c:998 [inline]
 __register_sysctl_table+0x9ef/0x1090 fs/proc/proc_sysctl.c:1347
 mpls_dev_sysctl_register+0x1b7/0x2d0 net/mpls/af_mpls.c:1421
 mpls_add_dev net/mpls/af_mpls.c:1472 [inline]
 mpls_dev_notify+0x214/0x8e0 net/mpls/af_mpls.c:1588
 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83
 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2123
 call_netdevice_notifiers_extack net/core/dev.c:2135 [inline]
 call_netdevice_notifiers net/core/dev.c:2149 [inline]
 register_netdevice+0x106b/0x1500 net/core/dev.c:10380
 __ip_tunnel_create+0x398/0x5c0 net/ipv4/ip_tunnel.c:267
 ip_tunnel_init_net+0x2e4/0x9d0 net/ipv4/ip_tunnel.c:1069
 ops_init+0xaf/0x470 net/core/net_namespace.c:140
 setup_net+0x40f/0xa30 net/core/net_namespace.c:333
 copy_net_ns+0x319/0x760 net/core/net_namespace.c:474
 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
 copy_namespaces+0x391/0x450 kernel/nsproxy.c:178
 copy_process+0x2cfc/0x74d0 kernel/fork.c:2122
 kernel_clone+0xe7/0xac0 kernel/fork.c:2509
 __do_sys_clone+0xc8/0x110 kernel/fork.c:2626
 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

Last potentially related work creation:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_record_aux_stack+0xa4/0xd0 mm/kasan/generic.c:348
 kvfree_call_rcu+0x74/0x990 kernel/rcu/tree.c:3594
 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:2123
 call_netdevice_notifiers_extack net/core/dev.c:2135 [inline]
 call_netdevice_notifiers net/core/dev.c:2149 [inline]
 unregister_netdevice_many+0x951/0x1790 net/core/dev.c:11093
 ip_tunnel_delete_nets+0x39f/0x5b0 net/ipv4/ip_tunnel.c:1122
 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:178
 cleanup_net+0x4ea/0xb10 net/core/net_namespace.c:595
 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422
 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+0xa4/0xd0 mm/kasan/generic.c:348
 kvfree_call_rcu+0x74/0x990 kernel/rcu/tree.c:3594
 subflow_ulp_release+0x225/0x2b0 net/mptcp/subflow.c:1672
 tcp_cleanup_ulp+0x78/0x130 net/ipv4/tcp_ulp.c:124
 tcp_v4_destroy_sock+0xea/0x760 net/ipv4/tcp_ipv4.c:2242
 tcp_v6_destroy_sock+0x11/0x20 net/ipv6/tcp_ipv6.c:1969
 inet_csk_destroy_sock+0x196/0x490 net/ipv4/inet_connection_sock.c:1009
 __tcp_close+0xd20/0x1160 net/ipv4/tcp.c:2869
 __mptcp_close_ssk+0x252/0x560 net/mptcp/protocol.c:2162
 __mptcp_destroy_sock+0x361/0x830 net/mptcp/protocol.c:2590
 mptcp_close+0x5b1/0x7a0 net/mptcp/protocol.c:2638
 inet_release+0x12e/0x280 net/ipv4/af_inet.c:431
 inet6_release+0x4c/0x70 net/ipv6/af_inet6.c:478
 __sock_release+0xcd/0x280 net/socket.c:648
 sock_close+0x18/0x20 net/socket.c:1300
 __fput+0x288/0x920 fs/file_table.c:280
 task_work_run+0xdd/0x1a0 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
 exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

The buggy address belongs to the object at ffff88806ff8f000
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 192 bytes inside of
 256-byte region [ffff88806ff8f000, ffff88806ff8f100)
The buggy address belongs to the page:
page:ffffea0001bfe3c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88806ff8f600 pfn:0x6ff8f
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffffea0000799b08 ffffea000280bcc8 ffff888010840500
raw: ffff88806ff8f600 ffff88806ff8f000 0000000100000004 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 7492, ts 1387081603753, free_ts 1382047698374
 prep_new_page mm/page_alloc.c:2436 [inline]
 get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4169
 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5391
 __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]
 kmem_cache_alloc_trace+0x38c/0x480 mm/slab.c:3573
 kmalloc include/linux/slab.h:591 [inline]
 kzalloc include/linux/slab.h:721 [inline]
 fib6_info_alloc+0xc1/0x210 net/ipv6/ip6_fib.c:155
 ip6_route_info_create+0x33e/0x1aa0 net/ipv6/route.c:3762
 addrconf_f6i_alloc+0x2b5/0x4c0 net/ipv6/route.c:4580
 ipv6_add_addr+0x3a6/0x1f00 net/ipv6/addrconf.c:1089
 inet6_addr_add+0x410/0xae0 net/ipv6/addrconf.c:2945
 inet6_rtm_newaddr+0xf00/0x1970 net/ipv6/addrconf.c:4871
 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5574
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504
 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:703 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:723
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1346 [inline]
 free_pcp_prepare+0x2c5/0x780 mm/page_alloc.c:1397
 free_unref_page_prepare mm/page_alloc.c:3332 [inline]
 free_unref_page+0x19/0x690 mm/page_alloc.c:3411
 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+0x8b/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+0x25f/0x540 mm/slab.c:3507
 prepare_kernel_cred+0x27/0x8a0 kernel/cred.c:724
 call_usermodehelper_exec_async+0x10e/0x580 kernel/umh.c:91
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

Memory state around the buggy address:
 ffff88806ff8ef80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88806ff8f000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88806ff8f080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff88806ff8f100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88806ff8f180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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