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BUG: KASAN: use-after-free in kill_pending_fw_fallback_reqs+0x66/0x290 drivers/base/firmware_loader/fallback.c:116
Read of size 8 at addr ffff88803797d0c0 by task syz-executor.1/17707

CPU: 1 PID: 17707 Comm: syz-executor.1 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+0x1ae/0x29f lib/dump_stack.c:105
 print_address_description+0x66/0x3b0 mm/kasan/report.c:233
 __kasan_report mm/kasan/report.c:419 [inline]
 kasan_report+0x163/0x210 mm/kasan/report.c:436
 kill_pending_fw_fallback_reqs+0x66/0x290 drivers/base/firmware_loader/fallback.c:116
 fw_pm_notify+0x5d/0xe0 drivers/base/firmware_loader/main.c:1450
 notifier_call_chain kernel/notifier.c:83 [inline]
 notifier_call_chain_robust kernel/notifier.c:118 [inline]
 blocking_notifier_call_chain_robust+0x13b/0x380 kernel/notifier.c:302
 pm_notifier_call_chain_robust+0x27/0x50 kernel/power/main.c:87
 snapshot_open+0x18a/0x260 kernel/power/user.c:75
 misc_open+0x346/0x3c0 drivers/char/misc.c:141
 chrdev_open+0x53b/0x5f0 fs/char_dev.c:414
 do_dentry_open+0x7cb/0x1020 fs/open.c:826
 do_open fs/namei.c:3374 [inline]
 path_openat+0x27e7/0x36b0 fs/namei.c:3507
 do_filp_open+0x253/0x4d0 fs/namei.c:3534
 do_sys_openat2+0x124/0x460 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+0x243/0x290 fs/open.c:1231
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/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:00007f695df0f188 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9
RDX: 0000000000000000 RSI: 00000000200001c0 RDI: ffffffffffffff9c
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffc3c41d45f R14: 00007f695df0f300 R15: 0000000000022000

Allocated by task 12431:
 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:434 [inline]
 ____kasan_kmalloc+0xc4/0xf0 mm/kasan/common.c:513
 kasan_kmalloc include/linux/kasan.h:264 [inline]
 kmem_cache_alloc_trace+0x96/0x340 mm/slub.c:2983
 kmalloc include/linux/slab.h:591 [inline]
 kzalloc include/linux/slab.h:721 [inline]
 smk_fetch security/smack/smack_lsm.c:288 [inline]
 smack_d_instantiate+0x946/0xd00 security/smack/smack_lsm.c:3445
 security_d_instantiate+0xa5/0x100 security/security.c:2038
 d_instantiate_new+0x61/0x110 fs/dcache.c:2027
 ext4_mkdir+0x8b6/0xc10 fs/ext4/namei.c:2955
 vfs_mkdir+0x451/0x630 fs/namei.c:3823
 do_mkdirat+0x267/0x3e0 fs/namei.c:3848
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Freed by task 12431:
 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:360
 ____kasan_slab_free+0x109/0x150 mm/kasan/common.c:366
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:1625 [inline]
 slab_free_freelist_hook+0x1d8/0x290 mm/slub.c:1650
 slab_free mm/slub.c:3210 [inline]
 kfree+0xd0/0x1f0 mm/slub.c:4264
 smk_fetch security/smack/smack_lsm.c:300 [inline]
 smack_d_instantiate+0x9da/0xd00 security/smack/smack_lsm.c:3445
 security_d_instantiate+0xa5/0x100 security/security.c:2038
 d_instantiate_new+0x61/0x110 fs/dcache.c:2027
 ext4_mkdir+0x8b6/0xc10 fs/ext4/namei.c:2955
 vfs_mkdir+0x451/0x630 fs/namei.c:3823
 do_mkdirat+0x267/0x3e0 fs/namei.c:3848
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 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:348
 __call_rcu kernel/rcu/tree.c:3029 [inline]
 call_rcu+0x1a0/0xa20 kernel/rcu/tree.c:3109
 fib6_info_release include/net/ip6_fib.h:337 [inline]
 fixup_permanent_addr net/ipv6/addrconf.c:3435 [inline]
 addrconf_permanent_addr net/ipv6/addrconf.c:3463 [inline]
 addrconf_notify+0xddb/0x2110 net/ipv6/addrconf.c:3531
 notifier_call_chain kernel/notifier.c:83 [inline]
 raw_notifier_call_chain+0xe7/0x170 kernel/notifier.c:410
 __dev_notify_flags+0x306/0x5d0 net/core/dev.c:2123
 dev_change_flags+0xe3/0x190 net/core/dev.c:8898
 do_setlink+0xcbd/0x3f70 net/core/rtnetlink.c:2721
 __rtnl_newlink net/core/rtnetlink.c:3393 [inline]
 rtnl_newlink+0x16e4/0x1cd0 net/core/rtnetlink.c:3508
 rtnetlink_rcv_msg+0x91c/0xe50 net/core/rtnetlink.c:5574
 netlink_rcv_skb+0x1f0/0x460 net/netlink/af_netlink.c:2504
 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
 netlink_unicast+0x7de/0x9b0 net/netlink/af_netlink.c:1340
 netlink_sendmsg+0x9e7/0xe00 net/netlink/af_netlink.c:1929
 sock_sendmsg_nosec net/socket.c:703 [inline]
 sock_sendmsg net/socket.c:723 [inline]
 __sys_sendto+0x541/0x720 net/socket.c:2019
 __do_sys_sendto net/socket.c:2031 [inline]
 __se_sys_sendto net/socket.c:2027 [inline]
 __x64_sys_sendto+0xda/0xf0 net/socket.c:2027
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 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:348
 __call_rcu kernel/rcu/tree.c:3029 [inline]
 call_rcu+0x1a0/0xa20 kernel/rcu/tree.c:3109
 fib6_info_release include/net/ip6_fib.h:337 [inline]
 __ip6_del_rt net/ipv6/route.c:3883 [inline]
 ip6_del_rt+0x1b3/0x280 net/ipv6/route.c:3894
 __ipv6_ifa_notify+0x9d1/0x1310 net/ipv6/addrconf.c:6110
 addrconf_ifdown+0xd97/0x1820 net/ipv6/addrconf.c:3820
 addrconf_notify+0x49d/0x2110 net/ipv6/addrconf.c:3631
 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:2123 [inline]
 call_netdevice_notifiers_extack net/core/dev.c:2135 [inline]
 call_netdevice_notifiers net/core/dev.c:2149 [inline]
 dev_close_many+0x38b/0x540 net/core/dev.c:1724
 unregister_netdevice_many+0x53a/0x1980 net/core/dev.c:11070
 default_device_exit_batch+0x43b/0x4c0 net/core/dev.c:11623
 ops_exit_list net/core/net_namespace.c:178 [inline]
 cleanup_net+0x7ec/0xc60 net/core/net_namespace.c:595
 process_one_work+0x833/0x10c0 kernel/workqueue.c:2276
 worker_thread+0xac1/0x1320 kernel/workqueue.c:2422
 kthread+0x453/0x480 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

The buggy address belongs to the object at ffff88803797d000
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 192 bytes inside of
 256-byte region [ffff88803797d000, ffff88803797d100)
The buggy address belongs to the page:
page:ffffea0000de5f00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3797c
head:ffffea0000de5f00 order:1 compound_mapcount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0000dd1380 0000000800000008 ffff888011041b40
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0x52a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 8638, ts 135665673841, free_ts 132755960797
 prep_new_page mm/page_alloc.c:2436 [inline]
 get_page_from_freelist+0x779/0xa30 mm/page_alloc.c:4169
 __alloc_pages+0x26c/0x5f0 mm/page_alloc.c:5391
 alloc_slab_page mm/slub.c:1688 [inline]
 allocate_slab+0xf1/0x540 mm/slub.c:1828
 new_slab mm/slub.c:1891 [inline]
 new_slab_objects mm/slub.c:2637 [inline]
 ___slab_alloc+0x1cf/0x350 mm/slub.c:2800
 __slab_alloc mm/slub.c:2840 [inline]
 slab_alloc_node mm/slub.c:2922 [inline]
 slab_alloc mm/slub.c:2964 [inline]
 __kmalloc+0x2e7/0x390 mm/slub.c:4108
 kmalloc include/linux/slab.h:596 [inline]
 kzalloc include/linux/slab.h:721 [inline]
 fib6_info_alloc+0x2c/0xd0 net/ipv6/ip6_fib.c:155
 ip6_route_info_create+0x507/0x1a50 net/ipv6/route.c:3762
 ip6_route_add+0x22/0x120 net/ipv6/route.c:3856
 addrconf_prefix_route net/ipv6/addrconf.c:2415 [inline]
 fixup_permanent_addr net/ipv6/addrconf.c:3439 [inline]
 addrconf_permanent_addr net/ipv6/addrconf.c:3463 [inline]
 addrconf_notify+0x122f/0x2110 net/ipv6/addrconf.c:3531
 notifier_call_chain kernel/notifier.c:83 [inline]
 raw_notifier_call_chain+0xe7/0x170 kernel/notifier.c:410
 __dev_notify_flags+0x306/0x5d0 net/core/dev.c:2123
 dev_change_flags+0xe3/0x190 net/core/dev.c:8898
 do_setlink+0xcbd/0x3f70 net/core/rtnetlink.c:2721
 __rtnl_newlink net/core/rtnetlink.c:3393 [inline]
 rtnl_newlink+0x16e4/0x1cd0 net/core/rtnetlink.c:3508
 rtnetlink_rcv_msg+0x91c/0xe50 net/core/rtnetlink.c:5574
 netlink_rcv_skb+0x1f0/0x460 net/netlink/af_netlink.c:2504
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+0xc29/0xd20 mm/page_alloc.c:1397
 free_unref_page_prepare mm/page_alloc.c:3332 [inline]
 free_unref_page+0x7e/0x550 mm/page_alloc.c:3411
 free_slab mm/slub.c:1931 [inline]
 discard_slab mm/slub.c:1937 [inline]
 unfreeze_partials+0x18c/0x1e0 mm/slub.c:2418
 put_cpu_partial+0xd2/0x210 mm/slub.c:2454
 __slab_free+0x3a8/0x6b0 mm/slub.c:3104
 do_slab_free mm/slub.c:3198 [inline]
 ___cache_free+0xfc/0x120 mm/slub.c:3217
 qlist_free_all mm/kasan/quarantine.c:165 [inline]
 kasan_quarantine_reduce+0x151/0x1c0 mm/kasan/quarantine.c:272
 __kasan_slab_alloc+0x2f/0xd0 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_node mm/slub.c:2956 [inline]
 kmem_cache_alloc_node+0x200/0x370 mm/slub.c:2992
 __alloc_skb+0xd8/0x580 net/core/skbuff.c:414
 alloc_skb include/linux/skbuff.h:1112 [inline]
 nlmsg_new include/net/netlink.h:953 [inline]
 rtmsg_ifinfo_build_skb+0x81/0x180 net/core/rtnetlink.c:3811
 rtmsg_ifinfo_event net/core/rtnetlink.c:3847 [inline]
 rtmsg_ifinfo+0x73/0x120 net/core/rtnetlink.c:3856
 netdev_state_change+0x1b6/0x260 net/core/dev.c:1516
 linkwatch_do_dev+0x10a/0x190 net/core/link_watch.c:167
 __linkwatch_run_queue+0x49f/0x7b0 net/core/link_watch.c:212
 linkwatch_event+0x48/0x50 net/core/link_watch.c:251

Memory state around the buggy address:
 ffff88803797cf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88803797d000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88803797d080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff88803797d100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88803797d180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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