================================================================== BUG: KASAN: use-after-free in cfusbl_device_notify+0x793/0x830 net/caif/caif_usb.c:138 Read of size 8 at addr ffff88806f8126f0 by task kworker/u16:0/9 CPU: 1 PID: 9 Comm: kworker/u16:0 Not tainted 6.2.0-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Workqueue: netns cleanup_net Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:306 [inline] print_report+0x15e/0x461 mm/kasan/report.c:417 kasan_report+0xbf/0x1f0 mm/kasan/report.c:517 cfusbl_device_notify+0x793/0x830 net/caif/caif_usb.c:138 notifier_call_chain+0xb5/0x200 kernel/notifier.c:87 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1936 call_netdevice_notifiers_extack net/core/dev.c:1974 [inline] call_netdevice_notifiers net/core/dev.c:1988 [inline] netdev_wait_allrefs_any net/core/dev.c:10219 [inline] netdev_run_todo+0xbc6/0x1100 net/core/dev.c:10333 default_device_exit_batch+0x456/0x590 net/core/dev.c:11341 ops_exit_list+0x125/0x170 net/core/net_namespace.c:174 cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:613 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x669/0x1090 kernel/workqueue.c:2436 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Allocated by task 6549: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] ____kasan_kmalloc mm/kasan/common.c:333 [inline] __kasan_kmalloc+0xa3/0xb0 mm/kasan/common.c:383 kmalloc include/linux/slab.h:580 [inline] kzalloc include/linux/slab.h:720 [inline] kobject_uevent_env+0x234/0x1620 lib/kobject_uevent.c:524 rx_queue_add_kobject net/core/net-sysfs.c:1074 [inline] net_rx_queue_update_kobjects+0xed/0x510 net/core/net-sysfs.c:1114 register_queue_kobjects net/core/net-sysfs.c:1774 [inline] netdev_register_kobject+0x279/0x400 net/core/net-sysfs.c:2019 register_netdevice+0xd77/0x1640 net/core/dev.c:10037 veth_newlink+0x33c/0x9a0 drivers/net/veth.c:1765 rtnl_newlink_create net/core/rtnetlink.c:3407 [inline] __rtnl_newlink+0x10c2/0x1840 net/core/rtnetlink.c:3624 rtnl_newlink+0x68/0xa0 net/core/rtnetlink.c:3637 rtnetlink_rcv_msg+0x43e/0xca0 net/core/rtnetlink.c:6141 netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2574 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline] netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1365 netlink_sendmsg+0x91b/0xe10 net/netlink/af_netlink.c:1942 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xd3/0x120 net/socket.c:734 __sys_sendto+0x23a/0x340 net/socket.c:2120 __do_sys_sendto net/socket.c:2132 [inline] __se_sys_sendto net/socket.c:2128 [inline] __x64_sys_sendto+0xe1/0x1b0 net/socket.c:2128 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 6549: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:523 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x13b/0x1a0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:177 [inline] __cache_free mm/slab.c:3396 [inline] __do_kmem_cache_free mm/slab.c:3582 [inline] __kmem_cache_free+0xcd/0x3b0 mm/slab.c:3589 kobject_uevent_env+0x2a3/0x1620 lib/kobject_uevent.c:626 rx_queue_add_kobject net/core/net-sysfs.c:1074 [inline] net_rx_queue_update_kobjects+0xed/0x510 net/core/net-sysfs.c:1114 register_queue_kobjects net/core/net-sysfs.c:1774 [inline] netdev_register_kobject+0x279/0x400 net/core/net-sysfs.c:2019 register_netdevice+0xd77/0x1640 net/core/dev.c:10037 veth_newlink+0x33c/0x9a0 drivers/net/veth.c:1765 rtnl_newlink_create net/core/rtnetlink.c:3407 [inline] __rtnl_newlink+0x10c2/0x1840 net/core/rtnetlink.c:3624 rtnl_newlink+0x68/0xa0 net/core/rtnetlink.c:3637 rtnetlink_rcv_msg+0x43e/0xca0 net/core/rtnetlink.c:6141 netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2574 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline] netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1365 netlink_sendmsg+0x91b/0xe10 net/netlink/af_netlink.c:1942 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xd3/0x120 net/socket.c:734 __sys_sendto+0x23a/0x340 net/socket.c:2120 __do_sys_sendto net/socket.c:2132 [inline] __se_sys_sendto net/socket.c:2128 [inline] __x64_sys_sendto+0xe1/0x1b0 net/socket.c:2128 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88806f812000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 1776 bytes inside of 4096-byte region [ffff88806f812000, ffff88806f813000) The buggy address belongs to the physical page: page:ffffea0001be0480 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x6f812 head:ffffea0001be0480 order:1 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0 flags: 0x4fff00000010200(slab|head|node=1|zone=1|lastcpupid=0x7ff) raw: 04fff00000010200 ffff888012440900 ffffea0001be0510 ffffea0001bbb190 raw: 0000000000000000 ffff88806f812000 0000000100000001 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 0x140cc0(GFP_USER|__GFP_COMP), pid 6549, tgid 6549 (syz-executor.2), ts 299959830732, free_ts 299904557454 prep_new_page mm/page_alloc.c:2531 [inline] get_page_from_freelist+0x119c/0x2ce0 mm/page_alloc.c:4283 __alloc_pages+0x1cb/0x5b0 mm/page_alloc.c:5549 __alloc_pages_node include/linux/gfp.h:237 [inline] kmem_getpages mm/slab.c:1363 [inline] cache_grow_begin+0x94/0x390 mm/slab.c:2576 fallback_alloc+0x1e2/0x2d0 mm/slab.c:3119 __do_cache_alloc mm/slab.c:3223 [inline] slab_alloc_node mm/slab.c:3256 [inline] __kmem_cache_alloc_node+0x174/0x510 mm/slab.c:3546 kmalloc_trace+0x26/0x60 mm/slab_common.c:1062 kmalloc include/linux/slab.h:580 [inline] kzalloc include/linux/slab.h:720 [inline] kobject_uevent_env+0x234/0x1620 lib/kobject_uevent.c:524 rx_queue_add_kobject net/core/net-sysfs.c:1074 [inline] net_rx_queue_update_kobjects+0xed/0x510 net/core/net-sysfs.c:1114 register_queue_kobjects net/core/net-sysfs.c:1774 [inline] netdev_register_kobject+0x279/0x400 net/core/net-sysfs.c:2019 register_netdevice+0xd77/0x1640 net/core/dev.c:10037 veth_newlink+0x33c/0x9a0 drivers/net/veth.c:1765 rtnl_newlink_create net/core/rtnetlink.c:3407 [inline] __rtnl_newlink+0x10c2/0x1840 net/core/rtnetlink.c:3624 rtnl_newlink+0x68/0xa0 net/core/rtnetlink.c:3637 rtnetlink_rcv_msg+0x43e/0xca0 net/core/rtnetlink.c:6141 netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2574 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline] netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1365 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1446 [inline] free_pcp_prepare+0x66a/0xc20 mm/page_alloc.c:1496 free_unref_page_prepare mm/page_alloc.c:3369 [inline] free_unref_page+0x1d/0x490 mm/page_alloc.c:3464 slab_destroy mm/slab.c:1619 [inline] slabs_destroy+0x85/0xc0 mm/slab.c:1639 __cache_free_alien mm/slab.c:774 [inline] cache_free_alien mm/slab.c:790 [inline] ___cache_free+0x204/0x3d0 mm/slab.c:3423 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x4f/0x1a0 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x192/0x220 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x63/0x90 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slab.h:761 [inline] slab_alloc_node mm/slab.c:3263 [inline] __kmem_cache_alloc_node+0x26b/0x510 mm/slab.c:3546 __do_kmalloc_node mm/slab_common.c:967 [inline] __kmalloc+0x4a/0xd0 mm/slab_common.c:981 kmalloc include/linux/slab.h:584 [inline] tomoyo_realpath_from_path+0xc3/0x600 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path2_perm+0x33b/0x6e0 security/tomoyo/file.c:923 tomoyo_path_rename+0x102/0x1b0 security/tomoyo/tomoyo.c:299 security_path_rename+0x121/0x230 security/security.c:1231 do_renameat2+0x476/0xc30 fs/namei.c:4917 __do_sys_rename fs/namei.c:4976 [inline] __se_sys_rename fs/namei.c:4974 [inline] __x64_sys_rename+0x81/0xa0 fs/namei.c:4974 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 Memory state around the buggy address: ffff88806f812580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88806f812600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88806f812680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88806f812700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88806f812780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================