================================================================== BUG: KASAN: use-after-free in cfusbl_device_notify+0x7c9/0x870 net/caif/caif_usb.c:138 Read of size 8 at addr ffff88807ac4e6f0 by task kworker/u4:6/1214 CPU: 0 PID: 1214 Comm: kworker/u4:6 Not tainted 5.19.0-rc3-syzkaller-00146-g92f20ff72066 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0xeb/0x467 mm/kasan/report.c:313 print_report mm/kasan/report.c:429 [inline] kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491 cfusbl_device_notify+0x7c9/0x870 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:1945 call_netdevice_notifiers_extack net/core/dev.c:1983 [inline] call_netdevice_notifiers net/core/dev.c:1997 [inline] netdev_wait_allrefs_any net/core/dev.c:10227 [inline] netdev_run_todo+0xbc0/0x10f0 net/core/dev.c:10341 default_device_exit_batch+0x44e/0x590 net/core/dev.c:11334 ops_exit_list+0x125/0x170 net/core/net_namespace.c:167 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:594 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 Allocated by task 3641: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc mm/kasan/common.c:515 [inline] ____kasan_kmalloc mm/kasan/common.c:474 [inline] __kasan_kmalloc+0xa6/0xd0 mm/kasan/common.c:524 kmalloc_node include/linux/slab.h:623 [inline] kvmalloc_node+0x3e/0x190 mm/util.c:613 kvmalloc include/linux/slab.h:750 [inline] kvzalloc include/linux/slab.h:758 [inline] alloc_netdev_mqs+0x98/0x1180 net/core/dev.c:10580 rtnl_create_link+0x9d7/0xc00 net/core/rtnetlink.c:3241 veth_newlink+0x214/0x9a0 drivers/net/veth.c:1753 rtnl_newlink_create net/core/rtnetlink.c:3363 [inline] __rtnl_newlink+0x1087/0x17e0 net/core/rtnetlink.c:3580 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3593 rtnetlink_rcv_msg+0x43a/0xc90 net/core/rtnetlink.c:6089 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2501 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x543/0x7f0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x917/0xe10 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:734 __sys_sendto+0x21a/0x320 net/socket.c:2119 __do_sys_sendto net/socket.c:2131 [inline] __se_sys_sendto net/socket.c:2127 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2127 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+0x46/0xb0 Freed by task 1214: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free+0x13d/0x180 mm/kasan/common.c:328 kasan_slab_free include/linux/kasan.h:200 [inline] __cache_free mm/slab.c:3425 [inline] kfree+0x113/0x310 mm/slab.c:3796 kvfree+0x42/0x50 mm/util.c:655 device_release+0x9f/0x240 drivers/base/core.c:2230 kobject_cleanup lib/kobject.c:673 [inline] kobject_release lib/kobject.c:704 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1c8/0x540 lib/kobject.c:721 netdev_run_todo+0x75e/0x10f0 net/core/dev.c:10362 default_device_exit_batch+0x44e/0x590 net/core/dev.c:11334 ops_exit_list+0x125/0x170 net/core/net_namespace.c:167 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:594 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 The buggy address belongs to the object at ffff88807ac4e000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 1776 bytes inside of 4096-byte region [ffff88807ac4e000, ffff88807ac4f000) The buggy address belongs to the physical page: page:ffffea0001eb1380 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7ac4e head:ffffea0001eb1380 order:1 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0000892208 ffffea0001ed7d08 ffff888011843d00 raw: 0000000000000000 ffff88807ac4e000 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 0x2460c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_COMP|__GFP_THISNODE), pid 3641, tgid 3641 (syz-executor787), ts 210855385315, free_ts 210802994009 prep_new_page mm/page_alloc.c:2456 [inline] get_page_from_freelist+0x1290/0x3b70 mm/page_alloc.c:4198 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5426 __alloc_pages_node include/linux/gfp.h:587 [inline] kmem_getpages mm/slab.c:1363 [inline] cache_grow_begin+0x75/0x350 mm/slab.c:2569 cache_alloc_refill+0x27f/0x380 mm/slab.c:2942 ____cache_alloc mm/slab.c:3024 [inline] ____cache_alloc mm/slab.c:3007 [inline] slab_alloc_node mm/slab.c:3227 [inline] kmem_cache_alloc_node_trace+0x518/0x5b0 mm/slab.c:3611 __do_kmalloc_node mm/slab.c:3633 [inline] __kmalloc_node+0x38/0x60 mm/slab.c:3641 kmalloc_node include/linux/slab.h:623 [inline] kvmalloc_node+0x3e/0x190 mm/util.c:613 kvmalloc include/linux/slab.h:750 [inline] kvzalloc include/linux/slab.h:758 [inline] alloc_netdev_mqs+0x98/0x1180 net/core/dev.c:10580 rtnl_create_link+0x9d7/0xc00 net/core/rtnetlink.c:3241 veth_newlink+0x214/0x9a0 drivers/net/veth.c:1753 rtnl_newlink_create net/core/rtnetlink.c:3363 [inline] __rtnl_newlink+0x1087/0x17e0 net/core/rtnetlink.c:3580 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3593 rtnetlink_rcv_msg+0x43a/0xc90 net/core/rtnetlink.c:6089 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2501 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x543/0x7f0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x917/0xe10 net/netlink/af_netlink.c:1921 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1371 [inline] free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1421 free_unref_page_prepare mm/page_alloc.c:3343 [inline] free_unref_page+0x19/0x6a0 mm/page_alloc.c:3438 slab_destroy mm/slab.c:1615 [inline] slabs_destroy+0x89/0xc0 mm/slab.c:1635 cache_flusharray mm/slab.c:3397 [inline] ___cache_free+0x34e/0x670 mm/slab.c:3460 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x4f/0x1b0 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x97/0xb0 mm/kasan/common.c:446 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:750 [inline] slab_alloc mm/slab.c:3302 [inline] kmem_cache_alloc_trace+0x258/0x4a0 mm/slab.c:3567 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:733 [inline] kobject_uevent_env+0x235/0x1660 lib/kobject_uevent.c:524 __kobject_del+0x169/0x200 lib/kobject.c:585 kobject_cleanup lib/kobject.c:664 [inline] kobject_release lib/kobject.c:704 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x2b6/0x540 lib/kobject.c:721 netdev_queue_update_kobjects+0x367/0x4e0 net/core/net-sysfs.c:1733 netif_set_real_num_tx_queues+0x1b6/0x770 net/core/dev.c:2893 veth_init_queues+0xdd/0x190 drivers/net/veth.c:1691 veth_newlink+0x687/0x9a0 drivers/net/veth.c:1817 rtnl_newlink_create net/core/rtnetlink.c:3363 [inline] __rtnl_newlink+0x1087/0x17e0 net/core/rtnetlink.c:3580 Memory state around the buggy address: ffff88807ac4e580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807ac4e600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807ac4e680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807ac4e700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807ac4e780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================