================================================================== 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 ffff88802351b0c0 by task syz-executor.3/5485 CPU: 1 PID: 5485 Comm: syz-executor.3 Not tainted 5.14.0-rc3-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+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:00007f3274509188 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 0000000000040041 RSI: 0000000020000100 RDI: ffffffffffffff9c RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffc0d90faff R14: 00007f3274509300 R15: 0000000000022000 Allocated by task 4717: 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] kmem_cache_alloc_trace+0x1e4/0x480 mm/slab.c:3575 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:746 [inline] _request_firmware+0x2de/0xe80 drivers/base/firmware_loader/main.c:808 request_firmware+0x32/0x50 drivers/base/firmware_loader/main.c:877 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:2392 ___sys_sendmsg+0xf3/0x170 net/socket.c:2446 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2475 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 4717: 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+0xcd/0x100 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:230 [inline] __cache_free mm/slab.c:3445 [inline] kfree+0x106/0x2c0 mm/slab.c:3803 __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:1055 release_firmware drivers/base/firmware_loader/main.c:842 [inline] _request_firmware+0x709/0xe80 drivers/base/firmware_loader/main.c:841 request_firmware+0x32/0x50 drivers/base/firmware_loader/main.c:877 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:2392 ___sys_sendmsg+0xf3/0x170 net/socket.c:2446 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2475 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 __call_rcu kernel/rcu/tree.c:3029 [inline] call_rcu+0xb1/0x750 kernel/rcu/tree.c:3109 free_fib_info net/ipv4/fib_semantics.c:256 [inline] fib_create_info+0x1fee/0x4890 net/ipv4/fib_semantics.c:1549 fib_table_insert+0x1cd/0x1af0 net/ipv4/fib_trie.c:1224 ip_rt_ioctl+0x9ab/0x1480 net/ipv4/fib_frontend.c:639 inet_ioctl+0x2d6/0x330 net/ipv4/af_inet.c:941 sock_do_ioctl+0xcb/0x2d0 net/socket.c:1094 sock_ioctl+0x477/0x6a0 net/socket.c:1221 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:1069 [inline] __se_sys_ioctl fs/ioctl.c:1055 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:1055 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 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 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 The buggy address belongs to the object at ffff88802351b000 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 192 bytes inside of 256-byte region [ffff88802351b000, ffff88802351b100) The buggy address belongs to the page: page:ffffea00008d46c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88802351b400 pfn:0x2351b flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea0000ba9a88 ffffea00008a7688 ffff888010840500 raw: ffff88802351b400 ffff88802351b000 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 8856, ts 207505937015, free_ts 207476563446 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] __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] 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 __addrconf_sysctl_register+0x1db/0x3d0 net/ipv6/addrconf.c:6965 addrconf_sysctl_register net/ipv6/addrconf.c:7012 [inline] addrconf_sysctl_register+0x139/0x1d0 net/ipv6/addrconf.c:7001 ipv6_add_dev+0x936/0x1120 net/ipv6/addrconf.c:445 addrconf_notify+0x872/0x2400 net/ipv6/addrconf.c:3491 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 nsim_init_netdevsim drivers/net/netdevsim/netdev.c:317 [inline] nsim_create+0x381/0x4d0 drivers/net/netdevsim/netdev.c:364 __nsim_dev_port_add+0x32e/0x830 drivers/net/netdevsim/dev.c:1295 nsim_dev_port_add_all+0x53/0x150 drivers/net/netdevsim/dev.c:1355 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_trace+0x256/0x480 mm/slab.c:3573 kmalloc include/linux/slab.h:591 [inline] netdevice_queue_work drivers/infiniband/core/roce_gid_mgmt.c:643 [inline] netdevice_event+0x1ab/0x830 drivers/infiniband/core/roce_gid_mgmt.c:802 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] __dev_notify_flags+0x110/0x2b0 net/core/dev.c:8860 dev_change_flags+0x112/0x170 net/core/dev.c:8898 do_setlink+0x90a/0x3900 net/core/rtnetlink.c:2721 __rtnl_newlink+0xddb/0x1760 net/core/rtnetlink.c:3393 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3508 Memory state around the buggy address: ffff88802351af80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802351b000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88802351b080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802351b100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802351b180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================