================================================================== BUG: KASAN: slab-use-after-free in netdev_need_ops_lock include/net/netdev_lock.h:30 [inline] BUG: KASAN: slab-use-after-free in netdev_unlock_ops include/net/netdev_lock.h:47 [inline] BUG: KASAN: slab-use-after-free in __linkwatch_run_queue+0x6fc/0x7dc net/core/link_watch.c:245 Read of size 1 at addr ffffaf8030ed6ca5 by task kworker/u9:4/958 CPU: 0 UID: 0 PID: 958 Comm: kworker/u9:4 Not tainted 6.16.0-rc1-syzkaller-gfda589c28604 #0 PREEMPT Hardware name: riscv-virtio,qemu (DT) Workqueue: events_unbound linkwatch_event Call Trace: [] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:132 [] show_stack+0x30/0x3c arch/riscv/kernel/stacktrace.c:138 [] __dump_stack lib/dump_stack.c:94 [inline] [] dump_stack_lvl+0x12e/0x1a6 lib/dump_stack.c:120 [] print_address_description mm/kasan/report.c:408 [inline] [] print_report+0x28e/0x5fe mm/kasan/report.c:521 [] kasan_report+0xf0/0x214 mm/kasan/report.c:634 [] __asan_report_load1_noabort+0x12/0x1a mm/kasan/report_generic.c:378 [] netdev_need_ops_lock include/net/netdev_lock.h:30 [inline] [] netdev_unlock_ops include/net/netdev_lock.h:47 [inline] [] __linkwatch_run_queue+0x6fc/0x7dc net/core/link_watch.c:245 [] linkwatch_event+0xaa/0xdc net/core/link_watch.c:304 [] process_one_work+0x96a/0x1f32 kernel/workqueue.c:3238 [] process_scheduled_works kernel/workqueue.c:3321 [inline] [] worker_thread+0x5ce/0xde8 kernel/workqueue.c:3402 [] kthread+0x39c/0x7d4 kernel/kthread.c:464 [] ret_from_fork_kernel+0x2a/0xbb2 arch/riscv/kernel/process.c:214 [] ret_from_fork_kernel_asm+0x16/0x18 arch/riscv/kernel/entry.S:327 Allocated by task 11455: stack_trace_save+0xa0/0xd2 kernel/stacktrace.c:122 kasan_save_stack+0x3e/0x6a mm/kasan/common.c:47 kasan_save_track+0x16/0x28 mm/kasan/common.c:68 kasan_save_alloc_info+0x30/0x3e mm/kasan/generic.c:562 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xa0/0xa6 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4328 [inline] __kvmalloc_node_noprof+0x27a/0x6ac mm/slub.c:5015 alloc_netdev_mqs+0xcc/0x11da net/core/dev.c:11711 rtnl_create_link+0xb2a/0xe54 net/core/rtnetlink.c:3631 rtnl_newlink_create net/core/rtnetlink.c:3813 [inline] __rtnl_newlink net/core/rtnetlink.c:3940 [inline] rtnl_newlink+0xb54/0x1d78 net/core/rtnetlink.c:4055 rtnetlink_rcv_msg+0x9e2/0xdbe net/core/rtnetlink.c:6944 netlink_rcv_skb+0x206/0x3be net/netlink/af_netlink.c:2534 rtnetlink_rcv+0x26/0x30 net/core/rtnetlink.c:6971 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x4f0/0x82c net/netlink/af_netlink.c:1339 netlink_sendmsg+0x85e/0xdd6 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0xcc/0x160 net/socket.c:727 __sys_sendto+0x27a/0x34e net/socket.c:2180 __do_sys_sendto net/socket.c:2187 [inline] __se_sys_sendto net/socket.c:2183 [inline] __riscv_sys_sendto+0xc0/0x158 net/socket.c:2183 syscall_handler+0x94/0x118 arch/riscv/include/asm/syscall.h:112 do_trap_ecall_u+0x396/0x530 arch/riscv/kernel/traps.c:341 handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:197 Freed by task 12: stack_trace_save+0xa0/0xd2 kernel/stacktrace.c:122 kasan_save_stack+0x3e/0x6a mm/kasan/common.c:47 kasan_save_track+0x16/0x28 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x5a mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x4e/0x68 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2381 [inline] slab_free mm/slub.c:4643 [inline] kfree+0x252/0x4da mm/slub.c:4842 kvfree+0x28/0x32 mm/slub.c:5058 netdev_release+0x84/0xb0 net/core/net-sysfs.c:2231 device_release+0x90/0x21c drivers/base/core.c:2568 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x238/0x4f0 lib/kobject.c:737 netdev_run_todo+0x6a6/0x10b4 net/core/dev.c:11412 rtnl_unlock+0x14/0x1c net/core/rtnetlink.c:157 default_device_exit_batch+0x67c/0x8b0 net/core/dev.c:12645 ops_exit_list net/core/net_namespace.c:206 [inline] ops_undo_list+0x3e8/0x9dc net/core/net_namespace.c:253 cleanup_net+0x3e0/0x7ce net/core/net_namespace.c:686 process_one_work+0x96a/0x1f32 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3321 [inline] worker_thread+0x5ce/0xde8 kernel/workqueue.c:3402 kthread+0x39c/0x7d4 kernel/kthread.c:464 ret_from_fork_kernel+0x2a/0xbb2 arch/riscv/kernel/process.c:214 ret_from_fork_kernel_asm+0x16/0x18 arch/riscv/kernel/entry.S:327 The buggy address belongs to the object at ffffaf8030ed6000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 3237 bytes inside of freed 4096-byte region [ffffaf8030ed6000, ffffaf8030ed7000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xb0ed0 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffffaf801e91c4c1 flags: 0xffe000000000040(head|node=0|zone=0|lastcpupid=0x7ff) page_type: f5(slab) raw: 0ffe000000000040 ffffaf80114093c0 ffff8d8000bf3400 dead000000000002 raw: 0000000000000000 0000000000040004 00000000f5000000 ffffaf801e91c4c1 head: 0ffe000000000040 ffffaf80114093c0 ffff8d8000bf3400 dead000000000002 head: 0000000000000000 0000000000040004 00000000f5000000 ffffaf801e91c4c1 head: 0ffe000000000003 ffff8d8000c3b401 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 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 10081, tgid 10081 (syz-executor), ts 2722230481400, free_ts 2721581043000 __set_page_owner+0x94/0x4a8 mm/page_owner.c:329 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0xdc/0x1ba mm/page_alloc.c:1704 prep_new_page mm/page_alloc.c:1712 [inline] get_page_from_freelist+0x880/0x3660 mm/page_alloc.c:3669 __alloc_frozen_pages_noprof+0x22e/0x2124 mm/page_alloc.c:4959 alloc_pages_mpol+0x1fa/0x5ba mm/mempolicy.c:2419 alloc_frozen_pages_noprof+0x174/0x2f0 mm/mempolicy.c:2490 alloc_slab_page mm/slub.c:2451 [inline] allocate_slab mm/slub.c:2619 [inline] new_slab+0x26e/0x34c mm/slub.c:2673 ___slab_alloc+0xb64/0x1214 mm/slub.c:3859 __slab_alloc.constprop.0+0x60/0xb0 mm/slub.c:3949 __slab_alloc_node mm/slub.c:4024 [inline] slab_alloc_node mm/slub.c:4185 [inline] __kmalloc_cache_noprof+0xd2/0x3e8 mm/slub.c:4354 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] snmp6_alloc_dev net/ipv6/addrconf.c:360 [inline] ipv6_add_dev+0x630/0x15c0 net/ipv6/addrconf.c:411 ipv6_find_idev+0x1b2/0x22e net/ipv6/addrconf.c:496 inet6_rtm_newaddr+0x5d4/0x1eaa net/ipv6/addrconf.c:5041 rtnetlink_rcv_msg+0x9e2/0xdbe net/core/rtnetlink.c:6944 netlink_rcv_skb+0x206/0x3be net/netlink/af_netlink.c:2534 rtnetlink_rcv+0x26/0x30 net/core/rtnetlink.c:6971 page last free pid 10450 tgid 10450 stack trace: __reset_page_owner+0x78/0x1ba mm/page_owner.c:308 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1248 [inline] __free_frozen_pages+0x998/0x1580 mm/page_alloc.c:2706 free_frozen_pages+0xe/0x16 mm/page_alloc.c:2744 __free_slab+0xc6/0x17c mm/slub.c:2688 free_slab+0x38/0x1ae mm/slub.c:2711 discard_slab mm/slub.c:2717 [inline] __put_partials+0x178/0x1e6 mm/slub.c:3186 put_cpu_partial+0x17c/0x296 mm/slub.c:3261 __slab_free+0x1f6/0x34e mm/slub.c:4513 do_slab_free mm/slub.c:4595 [inline] ___cache_free+0x1a4/0x1de mm/slub.c:4701 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x76/0x168 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x158/0x1ba mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x5c/0x82 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4148 [inline] slab_alloc_node mm/slub.c:4197 [inline] __do_kmalloc_node mm/slub.c:4327 [inline] __kvmalloc_node_noprof+0x238/0x6ac mm/slub.c:5015 seq_buf_alloc fs/seq_file.c:38 [inline] seq_read_iter+0x714/0x104a fs/seq_file.c:210 proc_reg_read_iter+0x198/0x252 fs/proc/inode.c:299 new_sync_read fs/read_write.c:491 [inline] vfs_read+0x770/0x950 fs/read_write.c:572 Memory state around the buggy address: ffffaf8030ed6b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffffaf8030ed6c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffffaf8030ed6c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffffaf8030ed6d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffffaf8030ed6d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================