================================================================== BUG: KASAN: use-after-free in cfusbl_device_notify+0x793/0x830 net/caif/caif_usb.c:138 Read of size 8 at addr ffff8880725e26f0 by task kworker/u4:4/16078 CPU: 1 PID: 16078 Comm: kworker/u4:4 Not tainted 6.2.0-rc7-syzkaller-00011-g05ecb680708a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 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: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 5107: 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+0xa3/0xb0 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: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: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 16078: 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:518 ____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 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 ffff8880725e2000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 1776 bytes inside of 4096-byte region [ffff8880725e2000, ffff8880725e3000) The buggy address belongs to the physical page: page:ffffea0001c97880 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x725e2 head:ffffea0001c97880 order:1 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff88801244da00 ffffea0001c97d10 ffffea0001c95c90 raw: 0000000000000000 ffff8880725e2000 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 5107, tgid 5107 (syz-executor.4), ts 120449456220, free_ts 120443229915 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 cache_alloc_refill+0x27f/0x380 mm/slab.c:2949 ____cache_alloc mm/slab.c:3025 [inline] ____cache_alloc mm/slab.c:3008 [inline] __do_cache_alloc mm/slab.c:3208 [inline] slab_alloc_node mm/slab.c:3256 [inline] __kmem_cache_alloc_node+0x44f/0x510 mm/slab.c:3546 __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: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 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 slab_destroy mm/slab.c:1619 [inline] slabs_destroy+0x85/0xc0 mm/slab.c:1639 cache_flusharray mm/slab.c:3367 [inline] ___cache_free+0x2ac/0x3d0 mm/slab.c:3430 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:302 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 kmalloc_trace+0x26/0x60 mm/slab_common.c:1062 kmalloc include/linux/slab.h:580 [inline] netdev_name_node_alloc net/core/dev.c:259 [inline] netdev_name_node_head_alloc net/core/dev.c:273 [inline] register_netdevice+0x40a/0x1640 net/core/dev.c:9969 veth_newlink+0x4d7/0x9a0 drivers/net/veth.c:1796 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 Memory state around the buggy address: ffff8880725e2580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880725e2600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880725e2680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880725e2700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880725e2780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================