================================================================== BUG: KASAN: slab-use-after-free in kernfs_root fs/kernfs/kernfs-internal.h:70 [inline] BUG: KASAN: slab-use-after-free in kernfs_next_descendant_post fs/kernfs/dir.c:1351 [inline] BUG: KASAN: slab-use-after-free in kernfs_activate fs/kernfs/dir.c:1406 [inline] BUG: KASAN: slab-use-after-free in kernfs_add_one+0x4f0/0x8b0 fs/kernfs/dir.c:819 Read of size 8 at addr ffff888026617e40 by task kworker/0:4/5892 CPU: 0 UID: 0 PID: 5892 Comm: kworker/0:4 Not tainted 6.12.0-rc7-syzkaller-00125-gcfaaa7d010d1 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 Workqueue: events request_firmware_work_func Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 kernfs_root fs/kernfs/kernfs-internal.h:70 [inline] kernfs_next_descendant_post fs/kernfs/dir.c:1351 [inline] kernfs_activate fs/kernfs/dir.c:1406 [inline] kernfs_add_one+0x4f0/0x8b0 fs/kernfs/dir.c:819 kernfs_create_dir_ns+0xd9/0x120 fs/kernfs/dir.c:1071 sysfs_create_dir_ns+0x189/0x3a0 fs/sysfs/dir.c:59 create_dir lib/kobject.c:73 [inline] kobject_add_internal+0x435/0x8d0 lib/kobject.c:240 kobject_add_varg lib/kobject.c:374 [inline] kobject_add+0x152/0x220 lib/kobject.c:426 device_add+0x4e5/0xbf0 drivers/base/core.c:3610 fw_load_sysfs_fallback drivers/base/firmware_loader/fallback.c:86 [inline] fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:162 [inline] firmware_fallback_sysfs+0x307/0x9e0 drivers/base/firmware_loader/fallback.c:238 _request_firmware+0xdf7/0x13b0 drivers/base/firmware_loader/main.c:942 request_firmware_work_func+0x12a/0x280 drivers/base/firmware_loader/main.c:1195 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 5892: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:247 [inline] slab_post_alloc_hook mm/slub.c:4085 [inline] slab_alloc_node mm/slub.c:4134 [inline] kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4141 __kernfs_new_node+0xd8/0x870 fs/kernfs/dir.c:624 kernfs_new_node+0x137/0x240 fs/kernfs/dir.c:700 kernfs_create_dir_ns+0x43/0x120 fs/kernfs/dir.c:1061 sysfs_create_dir_ns+0x189/0x3a0 fs/sysfs/dir.c:59 create_dir lib/kobject.c:73 [inline] kobject_add_internal+0x435/0x8d0 lib/kobject.c:240 kobject_add_varg lib/kobject.c:374 [inline] kobject_add+0x152/0x220 lib/kobject.c:426 device_add+0x4e5/0xbf0 drivers/base/core.c:3610 fw_load_sysfs_fallback drivers/base/firmware_loader/fallback.c:86 [inline] fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:162 [inline] firmware_fallback_sysfs+0x307/0x9e0 drivers/base/firmware_loader/fallback.c:238 _request_firmware+0xdf7/0x13b0 drivers/base/firmware_loader/main.c:942 request_firmware_work_func+0x12a/0x280 drivers/base/firmware_loader/main.c:1195 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Freed by task 7330: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:2342 [inline] slab_free mm/slub.c:4579 [inline] kmem_cache_free+0x1a2/0x420 mm/slub.c:4681 rcu_do_batch kernel/rcu/tree.c:2567 [inline] rcu_core+0xaaa/0x17a0 kernel/rcu/tree.c:2823 handle_softirqs+0x2c5/0x980 kernel/softirq.c:554 do_softirq+0x11b/0x1e0 kernel/softirq.c:455 __local_bh_enable_ip+0x1bb/0x200 kernel/softirq.c:382 inet6_fill_ifla6_attrs+0x15c1/0x2820 net/ipv6/addrconf.c:5832 inet6_fill_link_af+0x9e/0x120 net/ipv6/addrconf.c:5865 rtnl_fill_link_af+0x1a9/0x420 net/core/rtnetlink.c:1709 rtnl_fill_ifinfo+0x1e62/0x2270 net/core/rtnetlink.c:1972 rtmsg_ifinfo_build_skb+0x18a/0x260 net/core/rtnetlink.c:4108 rtmsg_ifinfo_event net/core/rtnetlink.c:4141 [inline] rtmsg_ifinfo+0x91/0x1b0 net/core/rtnetlink.c:4150 __dev_notify_flags+0xf7/0x400 net/core/dev.c:8880 rtnl_newlink_create net/core/rtnetlink.c:3547 [inline] __rtnl_newlink net/core/rtnetlink.c:3759 [inline] rtnl_newlink+0x1a45/0x20a0 net/core/rtnetlink.c:3772 rtnetlink_rcv_msg+0x73f/0xcf0 net/core/rtnetlink.c:6675 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2536 netlink_unicast_kernel net/netlink/af_netlink.c:1316 [inline] netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1342 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1886 sock_sendmsg_nosec net/socket.c:729 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:744 __sys_sendto+0x39b/0x4f0 net/socket.c:2214 __do_sys_sendto net/socket.c:2226 [inline] __se_sys_sendto net/socket.c:2222 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2222 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:47 __kasan_record_aux_stack+0xac/0xc0 mm/kasan/generic.c:541 __call_rcu_common kernel/rcu/tree.c:3086 [inline] call_rcu+0x167/0xa70 kernel/rcu/tree.c:3190 kernfs_put+0x1dc/0x370 fs/kernfs/dir.c:578 __kernfs_remove+0x768/0x870 fs/kernfs/dir.c:1508 kernfs_remove+0x7a/0xa0 fs/kernfs/dir.c:1528 __kobject_del+0xe2/0x310 lib/kobject.c:604 kobject_del+0x45/0x60 lib/kobject.c:627 device_del+0x7ff/0x9b0 drivers/base/core.c:3881 usb_disconnect+0x60b/0x950 drivers/usb/core/hub.c:2332 hub_port_connect drivers/usb/core/hub.c:5361 [inline] hub_port_connect_change drivers/usb/core/hub.c:5661 [inline] port_event drivers/usb/core/hub.c:5821 [inline] hub_event+0x1ebc/0x5150 drivers/usb/core/hub.c:5903 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 The buggy address belongs to the object at ffff888026617e10 which belongs to the cache kernfs_node_cache of size 176 The buggy address is located 48 bytes inside of freed 176-byte region [ffff888026617e10, ffff888026617ec0) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x26617 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801bafbdc0 ffffea00019fbec0 0000000000000008 raw: 0000000000000000 0000000000110011 00000001f5000000 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 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 6922, tgid 6922 (syz-executor), ts 118079835572, free_ts 118019917636 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1556 prep_new_page mm/page_alloc.c:1564 [inline] get_page_from_freelist+0x3649/0x3790 mm/page_alloc.c:3474 __alloc_pages_noprof+0x292/0x710 mm/page_alloc.c:4750 alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2265 alloc_slab_page+0x6a/0x140 mm/slub.c:2412 allocate_slab+0x5a/0x2f0 mm/slub.c:2578 new_slab mm/slub.c:2631 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3818 __slab_alloc+0x58/0xa0 mm/slub.c:3908 __slab_alloc_node mm/slub.c:3961 [inline] slab_alloc_node mm/slub.c:4122 [inline] kmem_cache_alloc_noprof+0x1c1/0x2a0 mm/slub.c:4141 __kernfs_new_node+0xd8/0x870 fs/kernfs/dir.c:624 kernfs_new_node+0x137/0x240 fs/kernfs/dir.c:700 kernfs_create_link+0xa5/0x1f0 fs/kernfs/symlink.c:39 sysfs_do_create_link_sd+0x85/0x110 fs/sysfs/symlink.c:44 bus_add_device+0x25a/0x460 drivers/base/bus.c:499 device_add+0x599/0xbf0 drivers/base/core.c:3629 nsim_bus_dev_new drivers/net/netdevsim/bus.c:442 [inline] new_device_store+0x3f3/0x890 drivers/net/netdevsim/bus.c:173 page last free pid 6995 tgid 6995 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_unref_folios+0xf37/0x1a20 mm/page_alloc.c:2704 folios_put_refs+0x76c/0x860 mm/swap.c:993 free_pages_and_swap_cache+0x5c8/0x690 mm/swap_state.c:335 __tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline] tlb_batch_pages_flush mm/mmu_gather.c:149 [inline] tlb_flush_mmu_free mm/mmu_gather.c:366 [inline] tlb_flush_mmu+0x3a3/0x680 mm/mmu_gather.c:373 tlb_finish_mmu+0xd4/0x200 mm/mmu_gather.c:465 exit_mmap+0x496/0xc40 mm/mmap.c:1936 __mmput+0x115/0x390 kernel/fork.c:1348 exit_mm+0x220/0x310 kernel/exit.c:571 do_exit+0x9b2/0x28e0 kernel/exit.c:926 do_group_exit+0x207/0x2c0 kernel/exit.c:1088 __do_sys_exit_group kernel/exit.c:1099 [inline] __se_sys_exit_group kernel/exit.c:1097 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1097 x64_sys_call+0x2634/0x2640 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888026617d00: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00 ffff888026617d80: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc >ffff888026617e00: fc fc fa fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888026617e80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888026617f00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================