================================================================== BUG: KASAN: use-after-free in cfusbl_device_notify+0x793/0x830 net/caif/caif_usb.c:138 Read of size 8 at addr ffff888049dd06f0 by task kworker/u4:1/11 CPU: 0 PID: 11 Comm: kworker/u4:1 Not tainted 6.2.0-rc2-syzkaller-00333-gcbdbb58b6c79 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 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/0x45d 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:1944 call_netdevice_notifiers_extack net/core/dev.c:1982 [inline] call_netdevice_notifiers net/core/dev.c:1996 [inline] netdev_wait_allrefs_any net/core/dev.c:10227 [inline] netdev_run_todo+0xbc6/0x1100 net/core/dev.c:10341 default_device_exit_batch+0x456/0x590 net/core/dev.c:11349 ops_exit_list+0x125/0x170 net/core/net_namespace.c:174 cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:606 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 9362: 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:371 [inline] ____kasan_kmalloc mm/kasan/common.c:330 [inline] __kasan_kmalloc+0xa5/0xb0 mm/kasan/common.c:380 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:968 [inline] __kmalloc_node+0x5d/0xd0 mm/slab_common.c:975 kmalloc_node include/linux/slab.h:610 [inline] kvmalloc_node+0xa2/0x1a0 mm/util.c:581 kvmalloc include/linux/slab.h:737 [inline] kvzalloc include/linux/slab.h:745 [inline] alloc_netdev_mqs+0x9c/0x1180 net/core/dev.c:10586 rtnl_create_link+0x9ff/0xca0 net/core/rtnetlink.c:3283 veth_newlink+0x211/0x9a0 drivers/net/veth.c:1750 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:2564 netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline] netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1356 netlink_sendmsg+0x91b/0xe10 net/netlink/af_netlink.c:1932 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xd3/0x120 net/socket.c:734 __sys_sendto+0x23a/0x340 net/socket.c:2117 __do_sys_sendto net/socket.c:2129 [inline] __se_sys_sendto net/socket.c:2125 [inline] __x64_sys_sendto+0xe1/0x1b0 net/socket.c:2125 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 11: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:518 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807 slab_free mm/slub.c:3787 [inline] __kmem_cache_free+0xaf/0x3b0 mm/slub.c:3800 kvfree+0x46/0x50 mm/util.c:627 device_release+0xa3/0x240 drivers/base/core.c:2331 kobject_cleanup lib/kobject.c:673 [inline] kobject_release lib/kobject.c:704 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1c2/0x4d0 lib/kobject.c:721 netdev_run_todo+0x762/0x1100 net/core/dev.c:10360 default_device_exit_batch+0x456/0x590 net/core/dev.c:11349 ops_exit_list+0x125/0x170 net/core/net_namespace.c:174 cleanup_net+0x4ee/0xb10 net/core/net_namespace.c:606 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 The buggy address belongs to the object at ffff888049dd0000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 1776 bytes inside of 4096-byte region [ffff888049dd0000, ffff888049dd1000) The buggy address belongs to the physical page: page:ffffea0001277400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x49dd0 head:ffffea0001277400 order:3 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0 memcg:ffff88804cebd681 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff88801244f500 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000040004 00000001ffffffff ffff88804cebd681 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d60c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 9362, tgid 9362 (syz-executor.5), ts 1233937449479, free_ts 1233905702735 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+0x1aa/0x270 mm/mempolicy.c:2286 alloc_slab_page mm/slub.c:1851 [inline] allocate_slab+0x25f/0x350 mm/slub.c:1998 new_slab mm/slub.c:2051 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3193 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3292 __slab_alloc_node mm/slub.c:3345 [inline] slab_alloc_node mm/slub.c:3442 [inline] __kmem_cache_alloc_node+0x1a4/0x430 mm/slub.c:3491 __do_kmalloc_node mm/slab_common.c:967 [inline] __kmalloc_node+0x4d/0xd0 mm/slab_common.c:975 kmalloc_node include/linux/slab.h:610 [inline] kvmalloc_node+0xa2/0x1a0 mm/util.c:581 kvmalloc include/linux/slab.h:737 [inline] kvzalloc include/linux/slab.h:745 [inline] alloc_netdev_mqs+0x9c/0x1180 net/core/dev.c:10586 rtnl_create_link+0x9ff/0xca0 net/core/rtnetlink.c:3283 veth_newlink+0x211/0x9a0 drivers/net/veth.c:1750 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:2564 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+0x65c/0xc00 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 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2637 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x192/0x220 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x66/0x90 mm/kasan/common.c:302 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slab.h:761 [inline] slab_alloc_node mm/slub.c:3452 [inline] __kmem_cache_alloc_node+0x1ea/0x430 mm/slub.c:3491 kmalloc_trace+0x26/0x60 mm/slab_common.c:1062 kmalloc include/linux/slab.h:580 [inline] __netdev_adjacent_dev_insert+0x1d3/0xaa0 net/core/dev.c:7456 __netdev_adjacent_dev_link_lists net/core/dev.c:7548 [inline] __netdev_adjacent_dev_link_neighbour net/core/dev.c:7577 [inline] __netdev_upper_dev_link+0x39c/0x7f0 net/core/dev.c:7637 netdev_upper_dev_link+0x8e/0xc0 net/core/dev.c:7683 hsr_portdev_setup net/hsr/hsr_slave.c:141 [inline] hsr_add_port+0x346/0x7c0 net/hsr/hsr_slave.c:184 hsr_dev_finalize+0x567/0x6f0 net/hsr/hsr_device.c:544 hsr_newlink+0x319/0x740 net/hsr/hsr_netlink.c:102 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 Memory state around the buggy address: ffff888049dd0580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888049dd0600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888049dd0680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888049dd0700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888049dd0780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================