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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 ffff88807e05b8c0 by task syz-executor.1/19804

CPU: 0 PID: 19804 Comm: syz-executor.1 Not tainted 5.14.0-rc3-next-20210729-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/0x309 mm/kasan/report.c:256
 __kasan_report mm/kasan/report.c:442 [inline]
 kasan_report.cold+0x83/0xdf mm/kasan/report.c:459
 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:1447
 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+0x209/0x2a0 kernel/power/user.c:85
 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:00007f0d82a57188 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9
RDX: 0000000000000001 RSI: 0000000020000240 RDI: ffffffffffffff9c
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffc051b37bf R14: 00007f0d82a57300 R15: 0000000000022000

Allocated by task 19319:
 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+0x9b/0xd0 mm/kasan/common.c:522
 kmalloc include/linux/slab.h:591 [inline]
 kzalloc include/linux/slab.h:721 [inline]
 __allocate_fw_priv drivers/base/firmware_loader/main.c:187 [inline]
 alloc_lookup_fw_priv drivers/base/firmware_loader/main.c:251 [inline]
 _request_firmware_prepare drivers/base/firmware_loader/main.c:744 [inline]
 _request_firmware+0x2de/0xe80 drivers/base/firmware_loader/main.c:806
 request_firmware+0x32/0x50 drivers/base/firmware_loader/main.c:875
 reg_reload_regdb+0x7a/0x240 net/wireless/reg.c:1095
 genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:739
 genl_family_rcv_msg net/netlink/genetlink.c:783 [inline]
 genl_rcv_msg+0x328/0x580 net/netlink/genetlink.c:800
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811
 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
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2402
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2456
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2485
 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 19319:
 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+0xfb/0x130 mm/kasan/common.c:374
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:1628 [inline]
 slab_free_freelist_hook+0xdf/0x240 mm/slub.c:1653
 slab_free mm/slub.c:3213 [inline]
 kfree+0xe4/0x530 mm/slub.c:4267
 __free_fw_priv drivers/base/firmware_loader/main.c:283 [inline]
 kref_put include/linux/kref.h:65 [inline]
 free_fw_priv+0x2b1/0x4d0 drivers/base/firmware_loader/main.c:290
 firmware_free_data drivers/base/firmware_loader/main.c:586 [inline]
 release_firmware.part.0+0xc7/0xf0 drivers/base/firmware_loader/main.c:1053
 release_firmware drivers/base/firmware_loader/main.c:840 [inline]
 _request_firmware+0x709/0xe80 drivers/base/firmware_loader/main.c:839
 request_firmware+0x32/0x50 drivers/base/firmware_loader/main.c:875
 reg_reload_regdb+0x7a/0x240 net/wireless/reg.c:1095
 genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:739
 genl_family_rcv_msg net/netlink/genetlink.c:783 [inline]
 genl_rcv_msg+0x328/0x580 net/netlink/genetlink.c:800
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811
 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
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2402
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2456
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2485
 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

The buggy address belongs to the object at ffff88807e05b800
 which belongs to the cache kmalloc-256 of size 256
The buggy address is located 192 bytes inside of
 256-byte region [ffff88807e05b800, ffff88807e05b900)
The buggy address belongs to the page:
page:ffffea0001f81680 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7e05a
head:ffffea0001f81680 order:1 compound_mapcount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0000684b80 0000000700000003 ffff888010841b40
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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6673, ts 219266214171, free_ts 212514841557
 prep_new_page mm/page_alloc.c:2424 [inline]
 get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4152
 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5374
 alloc_pages+0x1a3/0x2d0 mm/mempolicy.c:2174
 alloc_slab_page mm/slub.c:1691 [inline]
 allocate_slab+0x32e/0x4b0 mm/slub.c:1831
 new_slab mm/slub.c:1894 [inline]
 new_slab_objects mm/slub.c:2640 [inline]
 ___slab_alloc+0x4ba/0x820 mm/slub.c:2803
 __slab_alloc.constprop.0+0xa7/0xf0 mm/slub.c:2843
 slab_alloc_node mm/slub.c:2925 [inline]
 slab_alloc mm/slub.c:2967 [inline]
 kmem_cache_alloc_trace+0x30f/0x3c0 mm/slub.c:2984
 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:3744
 ip6_route_add+0x24/0x150 net/ipv6/route.c:3838
 addrconf_prefix_route+0x30a/0x4e0 net/ipv6/addrconf.c:2422
 inet6_addr_add+0x719/0xae0 net/ipv6/addrconf.c:2955
 inet6_rtm_newaddr+0xf00/0x1970 net/ipv6/addrconf.c:4878
 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5563
 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
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+0x373/0x860 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
 __vunmap+0x783/0xb70 mm/vmalloc.c:2609
 free_work+0x58/0x70 mm/vmalloc.c:82
 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

Memory state around the buggy address:
 ffff88807e05b780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88807e05b800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88807e05b880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff88807e05b900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88807e05b980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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