================================================================== BUG: KASAN: use-after-free in __list_del_entry_valid+0xe0/0xf0 lib/list_debug.c:51 Read of size 8 at addr ffff88801597fec0 by task systemd-udevd/12994 CPU: 0 PID: 12994 Comm: systemd-udevd Not tainted 5.12.0-rc4-next-20210326-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+0x141/0x1d7 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:232 __kasan_report mm/kasan/report.c:399 [inline] kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:416 __list_del_entry_valid+0xe0/0xf0 lib/list_debug.c:51 __list_del_entry include/linux/list.h:132 [inline] list_del_init include/linux/list.h:204 [inline] __fw_load_abort drivers/base/firmware_loader/fallback.c:97 [inline] __fw_load_abort drivers/base/firmware_loader/fallback.c:88 [inline] fw_load_abort drivers/base/firmware_loader/fallback.c:105 [inline] firmware_loading_store+0x141/0x650 drivers/base/firmware_loader/fallback.c:297 dev_attr_store+0x50/0x80 drivers/base/core.c:2024 sysfs_kf_write+0x110/0x160 fs/sysfs/file.c:139 kernfs_fop_write_iter+0x342/0x500 fs/kernfs/file.c:296 call_write_iter include/linux/fs.h:2106 [inline] new_sync_write+0x426/0x650 fs/read_write.c:518 vfs_write+0x796/0xa30 fs/read_write.c:605 ksys_write+0x12d/0x250 fs/read_write.c:658 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f6854ea7970 Code: 73 01 c3 48 8b 0d 28 d5 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 99 2d 2c 00 00 75 10 b8 01 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 7e 9b 01 00 48 89 04 24 RSP: 002b:00007ffd70898fa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f6854ea7970 RDX: 0000000000000002 RSI: 000055d881e7a3a0 RDI: 0000000000000007 RBP: 000055d881e7a3a0 R08: 00007f68560358c0 R09: 0000000000000002 R10: 00000000000004b0 R11: 0000000000000246 R12: 0000000000000002 R13: 0000000000000001 R14: 000055d881e617d0 R15: 0000000000000002 Allocated by task 13019: 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:428 [inline] ____kasan_kmalloc mm/kasan/common.c:507 [inline] ____kasan_kmalloc mm/kasan/common.c:466 [inline] __kasan_kmalloc+0x9b/0xd0 mm/kasan/common.c:516 kmalloc include/linux/slab.h:556 [inline] kzalloc include/linux/slab.h:686 [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 devlink_compat_flash_update+0x25b/0x4f0 net/core/devlink.c:10515 ethtool_flash_device+0x174/0x1a0 net/ethtool/ioctl.c:2088 dev_ethtool+0x5e3/0x46c0 net/ethtool/ioctl.c:2781 dev_ioctl+0x463/0xb70 net/core/dev_ioctl.c:440 sock_do_ioctl+0x148/0x2d0 net/socket.c:1062 sock_ioctl+0x477/0x6a0 net/socket.c:1179 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 13019: 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:357 ____kasan_slab_free mm/kasan/common.c:360 [inline] ____kasan_slab_free mm/kasan/common.c:325 [inline] __kasan_slab_free+0xfb/0x130 mm/kasan/common.c:368 kasan_slab_free include/linux/kasan.h:212 [inline] slab_free_hook mm/slub.c:1578 [inline] slab_free_freelist_hook+0xdf/0x240 mm/slub.c:1603 slab_free mm/slub.c:3163 [inline] kfree+0xe5/0x7f0 mm/slub.c:4230 __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 devlink_compat_flash_update+0x25b/0x4f0 net/core/devlink.c:10515 ethtool_flash_device+0x174/0x1a0 net/ethtool/ioctl.c:2088 dev_ethtool+0x5e3/0x46c0 net/ethtool/ioctl.c:2781 dev_ioctl+0x463/0xb70 net/core/dev_ioctl.c:440 sock_do_ioctl+0x148/0x2d0 net/socket.c:1062 sock_ioctl+0x477/0x6a0 net/socket.c:1179 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl fs/ioctl.c:739 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739 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+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xe5/0x110 mm/kasan/generic.c:345 kvfree_call_rcu+0x74/0x8c0 kernel/rcu/tree.c:3598 drop_sysctl_table+0x3c0/0x4e0 fs/proc/proc_sysctl.c:1646 unregister_sysctl_table fs/proc/proc_sysctl.c:1684 [inline] unregister_sysctl_table+0xc2/0x190 fs/proc/proc_sysctl.c:1659 mpls_dev_sysctl_unregister net/mpls/af_mpls.c:1442 [inline] mpls_dev_notify+0x4ba/0x8b0 net/mpls/af_mpls.c:1622 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2121 call_netdevice_notifiers_extack net/core/dev.c:2133 [inline] call_netdevice_notifiers net/core/dev.c:2147 [inline] unregister_netdevice_many+0x951/0x1790 net/core/dev.c:11000 ip_tunnel_delete_nets+0x3eb/0x5b0 net/ipv4/ip_tunnel.c:1113 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/0x1600 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Second to last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xe5/0x110 mm/kasan/generic.c:345 kvfree_call_rcu+0x74/0x8c0 kernel/rcu/tree.c:3598 drop_sysctl_table+0x3c0/0x4e0 fs/proc/proc_sysctl.c:1646 unregister_sysctl_table fs/proc/proc_sysctl.c:1684 [inline] unregister_sysctl_table+0xc2/0x190 fs/proc/proc_sysctl.c:1659 __addrconf_sysctl_unregister net/ipv6/addrconf.c:6971 [inline] addrconf_sysctl_unregister+0xee/0x1c0 net/ipv6/addrconf.c:6999 addrconf_ifdown.isra.0+0xfa8/0x15b0 net/ipv6/addrconf.c:3849 addrconf_notify+0x55c/0x23e0 net/ipv6/addrconf.c:3631 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2121 call_netdevice_notifiers_extack net/core/dev.c:2133 [inline] call_netdevice_notifiers net/core/dev.c:2147 [inline] unregister_netdevice_many+0x951/0x1790 net/core/dev.c:11000 default_device_exit_batch+0x2fa/0x3c0 net/core/dev.c:11520 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/0x1600 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 The buggy address belongs to the object at ffff88801597fe00 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 192 bytes inside of 256-byte region [ffff88801597fe00, ffff88801597ff00) The buggy address belongs to the page: page:ffffea0000565f80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1597e head:ffffea0000565f80 order:1 compound_mapcount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0000b58c00 0000000300000003 ffff888010841b40 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88801597fd80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801597fe00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801597fe80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801597ff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801597ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================