================================================================== BUG: KASAN: use-after-free in __list_splice include/linux/list.h:425 [inline] BUG: KASAN: use-after-free in list_splice_init include/linux/list.h:464 [inline] BUG: KASAN: use-after-free in __linkwatch_run_queue+0x5a1/0x630 net/core/link_watch.c:200 Write of size 8 at addr ffff88803d594570 by task kworker/0:8/2930 CPU: 0 PID: 2930 Comm: kworker/0:8 Not tainted 5.8.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events linkwatch_event Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x18f/0x20d lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xae/0x436 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530 __list_splice include/linux/list.h:425 [inline] list_splice_init include/linux/list.h:464 [inline] __linkwatch_run_queue+0x5a1/0x630 net/core/link_watch.c:200 linkwatch_event+0x4a/0x60 net/core/link_watch.c:251 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 Allocated by task 11434: save_stack+0x1b/0x40 mm/kasan/common.c:48 set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:494 kmalloc_node include/linux/slab.h:578 [inline] kvmalloc_node+0xb4/0xf0 mm/util.c:574 kvmalloc include/linux/mm.h:753 [inline] kvzalloc include/linux/mm.h:761 [inline] alloc_netdev_mqs+0x97/0xdc0 net/core/dev.c:9938 rtnl_create_link+0x219/0xad0 net/core/rtnetlink.c:3067 __rtnl_newlink+0xfa0/0x1750 net/core/rtnetlink.c:3329 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3398 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5461 netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2469 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2352 ___sys_sendmsg+0xf3/0x170 net/socket.c:2406 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2439 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 11434: save_stack+0x1b/0x40 mm/kasan/common.c:48 set_track mm/kasan/common.c:56 [inline] kasan_set_free_info mm/kasan/common.c:316 [inline] __kasan_slab_free+0xf5/0x140 mm/kasan/common.c:455 __cache_free mm/slab.c:3426 [inline] kfree+0x103/0x2c0 mm/slab.c:3757 kvfree+0x42/0x50 mm/util.c:603 device_release+0x71/0x200 drivers/base/core.c:1559 kobject_cleanup lib/kobject.c:693 [inline] kobject_release lib/kobject.c:722 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1c0/0x270 lib/kobject.c:739 put_device+0x1b/0x30 drivers/base/core.c:2779 free_netdev+0x35d/0x480 net/core/dev.c:10054 __rtnl_newlink+0x14d8/0x1750 net/core/rtnetlink.c:3354 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3398 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5461 netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2469 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2352 ___sys_sendmsg+0xf3/0x170 net/socket.c:2406 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2439 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff88803d594000 which belongs to the cache kmalloc-8k of size 8192 The buggy address is located 1392 bytes inside of 8192-byte region [ffff88803d594000, ffff88803d596000) The buggy address belongs to the page: page:ffffea0000f56500 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 head:ffffea0000f56500 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfffe0000010200(slab|head) raw: 00fffe0000010200 ffffea0001e90208 ffffea0000f56408 ffff8880aa0021c0 raw: 0000000000000000 ffff88803d594000 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88803d594400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88803d594480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88803d594500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88803d594580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88803d594600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================