platform regulatory.0: Falling back to sysfs fallback for: regulatory.db
==================================================================
BUG: KASAN: use-after-free in __list_add_valid+0x36/0xc0 lib/list_debug.c:23
Read of size 8 at addr ffff888023979ac8 by task syz-executor.0/13393

CPU: 1 PID: 13393 Comm: syz-executor.0 Not tainted 5.12.0-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:79 [inline]
 dump_stack+0x176/0x24e lib/dump_stack.c:120
 print_address_description+0x5f/0x3a0 mm/kasan/report.c:232
 __kasan_report mm/kasan/report.c:399 [inline]
 kasan_report+0x15e/0x210 mm/kasan/report.c:416
 __list_add_valid+0x36/0xc0 lib/list_debug.c:23
 __list_add include/linux/list.h:67 [inline]
 list_add include/linux/list.h:86 [inline]
 fw_load_sysfs_fallback+0x110/0x720 drivers/base/firmware_loader/fallback.c:516
 fw_load_from_user_helper+0x242/0x320 drivers/base/firmware_loader/fallback.c:581
 _request_firmware+0x2c5/0x4c0 drivers/base/firmware_loader/main.c:831
 request_firmware+0x35/0x50 drivers/base/firmware_loader/main.c:875
 reg_reload_regdb+0x3a/0x1b0 net/wireless/reg.c:1095
 genl_family_rcv_msg_doit net/netlink/genetlink.c:739 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:783 [inline]
 genl_rcv_msg+0xe4e/0x1280 net/netlink/genetlink.c:800
 netlink_rcv_skb+0x190/0x3a0 net/netlink/af_netlink.c:2502
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811
 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
 netlink_unicast+0x786/0x940 net/netlink/af_netlink.c:1338
 netlink_sendmsg+0x9ae/0xd50 net/netlink/af_netlink.c:1927
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg net/socket.c:674 [inline]
 ____sys_sendmsg+0x519/0x800 net/socket.c:2350
 ___sys_sendmsg net/socket.c:2404 [inline]
 __sys_sendmsg+0x2bf/0x370 net/socket.c:2433
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x465f69
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:00007fdf32b15188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465f69
RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000000000003
RBP: 00000000004bfa8f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60
R13: 00007fff89d31e7f R14: 00007fdf32b15300 R15: 0000000000022000

Allocated by task 13355:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:427 [inline]
 ____kasan_kmalloc+0xc2/0xf0 mm/kasan/common.c:506
 kasan_kmalloc include/linux/kasan.h:233 [inline]
 kmem_cache_alloc_trace+0x21b/0x350 mm/slub.c:2934
 kmalloc include/linux/slab.h:554 [inline]
 kzalloc include/linux/slab.h:684 [inline]
 __allocate_fw_priv+0x98/0x340 drivers/base/firmware_loader/main.c:186
 alloc_lookup_fw_priv+0x1c3/0x380 drivers/base/firmware_loader/main.c:250
 _request_firmware_prepare+0x23c/0x5b0 drivers/base/firmware_loader/main.c:744
 _request_firmware+0xd9/0x4c0 drivers/base/firmware_loader/main.c:806
 request_firmware+0x35/0x50 drivers/base/firmware_loader/main.c:875
 reg_reload_regdb+0x3a/0x1b0 net/wireless/reg.c:1095
 genl_family_rcv_msg_doit net/netlink/genetlink.c:739 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:783 [inline]
 genl_rcv_msg+0xe4e/0x1280 net/netlink/genetlink.c:800
 netlink_rcv_skb+0x190/0x3a0 net/netlink/af_netlink.c:2502
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811
 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
 netlink_unicast+0x786/0x940 net/netlink/af_netlink.c:1338
 netlink_sendmsg+0x9ae/0xd50 net/netlink/af_netlink.c:1927
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg net/socket.c:674 [inline]
 ____sys_sendmsg+0x519/0x800 net/socket.c:2350
 ___sys_sendmsg net/socket.c:2404 [inline]
 __sys_sendmsg+0x2bf/0x370 net/socket.c:2433
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Freed by task 13355:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x3d/0x70 mm/kasan/common.c:46
 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:357
 ____kasan_slab_free+0x100/0x140 mm/kasan/common.c:360
 kasan_slab_free include/linux/kasan.h:199 [inline]
 slab_free_hook mm/slub.c:1562 [inline]
 slab_free_freelist_hook+0x171/0x270 mm/slub.c:1600
 slab_free mm/slub.c:3161 [inline]
 kfree+0xcf/0x2d0 mm/slub.c:4213
 kref_put include/linux/kref.h:65 [inline]
 free_fw_priv drivers/base/firmware_loader/main.c:289 [inline]
 firmware_free_data drivers/base/firmware_loader/main.c:584 [inline]
 release_firmware+0x139/0x1b0 drivers/base/firmware_loader/main.c:1053
 _request_firmware+0x3e1/0x4c0 drivers/base/firmware_loader/main.c:839
 request_firmware+0x35/0x50 drivers/base/firmware_loader/main.c:875
 reg_reload_regdb+0x3a/0x1b0 net/wireless/reg.c:1095
 genl_family_rcv_msg_doit net/netlink/genetlink.c:739 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:783 [inline]
 genl_rcv_msg+0xe4e/0x1280 net/netlink/genetlink.c:800
 netlink_rcv_skb+0x190/0x3a0 net/netlink/af_netlink.c:2502
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811
 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
 netlink_unicast+0x786/0x940 net/netlink/af_netlink.c:1338
 netlink_sendmsg+0x9ae/0xd50 net/netlink/af_netlink.c:1927
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg net/socket.c:674 [inline]
 ____sys_sendmsg+0x519/0x800 net/socket.c:2350
 ___sys_sendmsg net/socket.c:2404 [inline]
 __sys_sendmsg+0x2bf/0x370 net/socket.c:2433
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Last potentially related work creation:
 kasan_save_stack+0x27/0x50 mm/kasan/common.c:38
 kasan_record_aux_stack+0xee/0x120 mm/kasan/generic.c:345
 kvfree_call_rcu+0x14f/0x6c0 kernel/rcu/tree.c:3577
 drop_sysctl_table+0x2c2/0x400 fs/proc/proc_sysctl.c:1646
 drop_sysctl_table+0x2d4/0x400 fs/proc/proc_sysctl.c:1649
 unregister_sysctl_table+0x88/0x130 fs/proc/proc_sysctl.c:1684
 __devinet_sysctl_unregister net/ipv4/devinet.c:2594 [inline]
 devinet_sysctl_unregister net/ipv4/devinet.c:2622 [inline]
 inetdev_destroy net/ipv4/devinet.c:324 [inline]
 inetdev_event+0x6dc/0x14b0 net/ipv4/devinet.c:1598
 notifier_call_chain kernel/notifier.c:83 [inline]
 raw_notifier_call_chain+0xe7/0x170 kernel/notifier.c:410
 call_netdevice_notifiers_info net/core/dev.c:2063 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:2075 [inline]
 call_netdevice_notifiers net/core/dev.c:2089 [inline]
 unregister_netdevice_many+0xee6/0x18e0 net/core/dev.c:10905
 ip_tunnel_delete_nets+0x2e5/0x310 net/ipv4/ip_tunnel.c:1113
 ops_exit_list net/core/net_namespace.c:178 [inline]
 setup_net+0x77b/0x960 net/core/net_namespace.c:356
 copy_net_ns+0x392/0x5e0 net/core/net_namespace.c:474
 create_new_namespaces+0x4ce/0xa00 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x123/0x190 kernel/nsproxy.c:226
 ksys_unshare+0x45b/0x950 kernel/fork.c:2986
 __do_sys_unshare kernel/fork.c:3054 [inline]
 __se_sys_unshare kernel/fork.c:3052 [inline]
 __x64_sys_unshare+0x34/0x40 kernel/fork.c:3052
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Second to last potentially related work creation:
 kasan_save_stack+0x27/0x50 mm/kasan/common.c:38
 kasan_record_aux_stack+0xee/0x120 mm/kasan/generic.c:345
 kvfree_call_rcu+0x14f/0x6c0 kernel/rcu/tree.c:3577
 drop_sysctl_table+0x2c2/0x400 fs/proc/proc_sysctl.c:1646
 unregister_sysctl_table+0x88/0x130 fs/proc/proc_sysctl.c:1684
 ipv6_sysctl_net_exit+0x117/0x190 net/ipv6/sysctl_net_ipv6.c:274
 ops_exit_list net/core/net_namespace.c:175 [inline]
 setup_net+0x70b/0x960 net/core/net_namespace.c:356
 copy_net_ns+0x392/0x5e0 net/core/net_namespace.c:474
 create_new_namespaces+0x4ce/0xa00 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x123/0x190 kernel/nsproxy.c:226
 ksys_unshare+0x45b/0x950 kernel/fork.c:2986
 __do_sys_unshare kernel/fork.c:3054 [inline]
 __se_sys_unshare kernel/fork.c:3052 [inline]
 __x64_sys_unshare+0x34/0x40 kernel/fork.c:3052
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

The buggy address belongs to the object at ffff888023979a00
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 200 bytes inside of
 256-byte region [ffff888023979a00, ffff888023979b00)
The buggy address belongs to the page:
page:ffffea00008e5e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x23978
head:ffffea00008e5e00 order:1 compound_mapcount:0
flags: 0xfff00000010200(slab|head)
raw: 00fff00000010200 0000000000000000 0000000c00000001 ffff888010841b40
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888023979980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888023979a00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888023979a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                              ^
 ffff888023979b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888023979b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================