================================================================== BUG: KASAN: use-after-free in free_netdev+0x58c/0x620 net/core/dev.c:10714 Read of size 8 at addr ffff88805c3a5160 by task kworker/u4:12/5401 CPU: 1 PID: 5401 Comm: kworker/u4:12 Not tainted 6.1.0-rc5-next-20221114-syzkaller #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+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:253 [inline] print_report+0x15e/0x45d mm/kasan/report.c:364 kasan_report+0xbb/0x1f0 mm/kasan/report.c:464 free_netdev+0x58c/0x620 net/core/dev.c:10714 netdev_run_todo+0xb4a/0x1100 net/core/dev.c:10366 default_device_exit_batch+0x452/0x590 net/core/dev.c:11353 ops_exit_list+0x125/0x170 net/core/net_namespace.c:174 cleanup_net+0x4ea/0xb10 net/core/net_namespace.c:606 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Allocated by task 5248: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 kasan_set_track+0x21/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:376 [inline] ____kasan_kmalloc mm/kasan/common.c:335 [inline] __kasan_kmalloc+0xa1/0xb0 mm/kasan/common.c:385 kasan_kmalloc include/linux/kasan.h:212 [inline] __do_kmalloc_node mm/slab_common.c:955 [inline] __kmalloc+0x56/0xc0 mm/slab_common.c:968 kmalloc_array include/linux/slab.h:627 [inline] kcalloc include/linux/slab.h:658 [inline] veth_alloc_queues drivers/net/veth.c:1404 [inline] veth_dev_init+0x152/0x330 drivers/net/veth.c:1431 register_netdevice+0x56f/0x1640 net/core/dev.c:9987 veth_newlink+0x338/0x9a0 drivers/net/veth.c:1828 rtnl_newlink_create net/core/rtnetlink.c:3407 [inline] __rtnl_newlink+0x10c2/0x1840 net/core/rtnetlink.c:3624 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3637 rtnetlink_rcv_msg+0x43a/0xca0 net/core/rtnetlink.c:6141 netlink_rcv_skb+0x161/0x440 net/netlink/af_netlink.c:2564 netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline] netlink_unicast+0x543/0x7f0 net/netlink/af_netlink.c:1356 netlink_sendmsg+0x917/0xe10 net/netlink/af_netlink.c:1932 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:734 __sys_sendto+0x236/0x340 net/socket.c:2117 __do_sys_sendto net/socket.c:2129 [inline] __se_sys_sendto net/socket.c:2125 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2125 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+0x63/0xcd Freed by task 5401: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 kasan_set_track+0x21/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2a/0x40 mm/kasan/generic.c:518 ____kasan_slab_free mm/kasan/common.c:241 [inline] ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:205 kasan_slab_free include/linux/kasan.h:178 [inline] slab_free_hook mm/slub.c:1763 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1789 slab_free mm/slub.c:3696 [inline] __kmem_cache_free+0xab/0x3b0 mm/slub.c:3709 veth_free_queues drivers/net/veth.c:1420 [inline] veth_dev_free+0x33/0x70 drivers/net/veth.c:1442 netdev_run_todo+0x6bb/0x1100 net/core/dev.c:10364 default_device_exit_batch+0x452/0x590 net/core/dev.c:11353 ops_exit_list+0x125/0x170 net/core/net_namespace.c:174 cleanup_net+0x4ea/0xb10 net/core/net_namespace.c:606 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 The buggy address belongs to the object at ffff88805c3a5000 which belongs to the cache kmalloc-cg-2k of size 2048 The buggy address is located 352 bytes inside of 2048-byte region [ffff88805c3a5000, ffff88805c3a5800) The buggy address belongs to the physical page: page:ffffea000170e800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5c3a0 head:ffffea000170e800 order:3 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff88801184c140 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5261, tgid 5261 (syz-executor.2), ts 57643771246, free_ts 13378854047 prep_new_page mm/page_alloc.c:2561 [inline] get_page_from_freelist+0x10b5/0x2d50 mm/page_alloc.c:4310 __alloc_pages+0x1c7/0x5a0 mm/page_alloc.c:5569 alloc_pages+0x1a6/0x270 mm/mempolicy.c:2285 alloc_slab_page mm/slub.c:1833 [inline] allocate_slab+0x25e/0x350 mm/slub.c:1980 new_slab mm/slub.c:2033 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3211 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3310 slab_alloc_node mm/slub.c:3395 [inline] __kmem_cache_alloc_node+0x1a1/0x430 mm/slub.c:3472 __do_kmalloc_node mm/slab_common.c:954 [inline] __kmalloc_node_track_caller+0x47/0xc0 mm/slab_common.c:975 kmemdup+0x28/0x60 mm/util.c:129 kmemdup include/linux/fortify-string.h:695 [inline] neigh_sysctl_register+0x9a/0x5e0 net/core/neighbour.c:3790 devinet_sysctl_register+0xb1/0x230 net/ipv4/devinet.c:2623 inetdev_init+0x286/0x580 net/ipv4/devinet.c:279 inetdev_event+0xa85/0x1610 net/ipv4/devinet.c:1534 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] register_netdevice+0xfb0/0x1640 net/core/dev.c:10090 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1468 [inline] free_pcp_prepare+0x65c/0xc00 mm/page_alloc.c:1518 free_unref_page_prepare mm/page_alloc.c:3409 [inline] free_unref_page+0x19/0x4d0 mm/page_alloc.c:3505 free_contig_range+0xb1/0x180 mm/page_alloc.c:9498 destroy_args+0xa8/0x64c mm/debug_vm_pgtable.c:998 debug_vm_pgtable+0x28da/0x296b mm/debug_vm_pgtable.c:1318 do_one_initcall+0x13d/0x790 init/main.c:1306 do_initcall_level init/main.c:1379 [inline] do_initcalls init/main.c:1395 [inline] do_basic_setup init/main.c:1414 [inline] kernel_init_freeable+0x6f9/0x782 init/main.c:1634 kernel_init+0x1a/0x1d0 init/main.c:1522 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Memory state around the buggy address: ffff88805c3a5000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805c3a5080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88805c3a5100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805c3a5180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805c3a5200: fb fb fb fb fb fb fb fb 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