================================================================== BUG: KASAN: slab-use-after-free in __ethtool_get_link_ksettings+0x188/0x1a0 net/ethtool/ioctl.c:443 Read of size 8 at addr ffffaf801c9442e8 by task kworker/1:4/3829 CPU: 1 UID: 0 PID: 3829 Comm: kworker/1:4 Not tainted syzkaller #0 PREEMPT Hardware name: riscv-virtio,qemu (DT) Workqueue: infiniband ib_cache_event_task Call Trace: [] dump_backtrace+0x2e/0x3c arch/riscv/kernel/stacktrace.c:149 [] show_stack+0x30/0x3c arch/riscv/kernel/stacktrace.c:155 [] __dump_stack lib/dump_stack.c:94 [inline] [] dump_stack_lvl+0x114/0x1ac lib/dump_stack.c:120 [] print_address_description mm/kasan/report.c:378 [inline] [] print_report+0x296/0x5bc mm/kasan/report.c:482 [] kasan_report+0xf0/0x220 mm/kasan/report.c:595 [] __asan_report_load8_noabort+0x12/0x1c mm/kasan/report_generic.c:381 [] __ethtool_get_link_ksettings+0x188/0x1a0 net/ethtool/ioctl.c:443 [] ipvlan_ethtool_get_link_ksettings+0x46/0x5c drivers/net/ipvlan/ipvlan_main.c:413 [] __ethtool_get_link_ksettings+0xf4/0x1a0 net/ethtool/ioctl.c:450 [] ib_get_eth_speed+0x140/0xa6c drivers/infiniband/core/verbs.c:1999 [] rxe_query_port+0x146/0x2fc drivers/infiniband/sw/rxe/rxe_verbs.c:62 [] __ib_query_port drivers/infiniband/core/device.c:2148 [inline] [] ib_query_port drivers/infiniband/core/device.c:2180 [inline] [] ib_query_port+0x3cc/0x82c drivers/infiniband/core/device.c:2170 [] ib_cache_update.part.0+0xe2/0xb4c drivers/infiniband/core/cache.c:1459 [] ib_cache_update drivers/infiniband/core/cache.c:1539 [inline] [] ib_cache_event_task+0x18c/0x25c drivers/infiniband/core/cache.c:1539 [] process_one_work+0x930/0x1e14 kernel/workqueue.c:3257 [] process_scheduled_works kernel/workqueue.c:3340 [inline] [] worker_thread+0x540/0xcbc kernel/workqueue.c:3421 [] kthread+0x37c/0x778 kernel/kthread.c:463 [] ret_from_fork_kernel+0x2a/0xbbc arch/riscv/kernel/process.c:228 [] ret_from_fork_kernel_asm+0x16/0x18 arch/riscv/kernel/entry.S:363 Allocated by task 3203: stack_trace_save+0xa0/0xd4 kernel/stacktrace.c:122 kasan_save_stack+0x3e/0x68 mm/kasan/common.c:57 kasan_save_track+0x16/0x28 mm/kasan/common.c:78 kasan_save_alloc_info+0x30/0x40 mm/kasan/generic.c:570 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0xa0/0xa8 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5657 [inline] __kvmalloc_node_noprof+0x2a6/0xb60 mm/slub.c:7140 alloc_netdev_mqs+0xc6/0x11c4 net/core/dev.c:12012 rtnl_create_link+0xa34/0xd50 net/core/rtnetlink.c:3648 rtnl_newlink_create net/core/rtnetlink.c:3830 [inline] __rtnl_newlink net/core/rtnetlink.c:3957 [inline] rtnl_newlink+0xc5a/0x2050 net/core/rtnetlink.c:4072 rtnetlink_rcv_msg+0x8e2/0xd84 net/core/rtnetlink.c:6958 netlink_rcv_skb+0x1e8/0x394 net/netlink/af_netlink.c:2550 rtnetlink_rcv+0x26/0x30 net/core/rtnetlink.c:6985 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x50c/0x7d8 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x7e0/0xd64 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0xca/0x160 net/socket.c:742 __sys_sendto+0x278/0x350 net/socket.c:2206 __do_sys_sendto net/socket.c:2213 [inline] __se_sys_sendto net/socket.c:2209 [inline] __riscv_sys_sendto+0xc0/0x158 net/socket.c:2209 syscall_handler+0x92/0x114 arch/riscv/include/asm/syscall.h:112 do_trap_ecall_u+0x3d2/0x58c arch/riscv/kernel/traps.c:344 handle_exception+0x15e/0x16a arch/riscv/kernel/entry.S:232 Freed by task 4183: stack_trace_save+0xa0/0xd4 kernel/stacktrace.c:122 kasan_save_stack+0x3e/0x68 mm/kasan/common.c:57 kasan_save_track+0x16/0x28 mm/kasan/common.c:78 kasan_save_free_info+0x40/0x5c mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5e/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2540 [inline] slab_free mm/slub.c:6674 [inline] kfree+0x140/0x7ec mm/slub.c:6882 kvfree+0x28/0x34 mm/slub.c:7189 netdev_release+0x84/0xb0 net/core/net-sysfs.c:2252 device_release+0x90/0x21c drivers/base/core.c:2565 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x20a/0x5e0 lib/kobject.c:737 netdev_run_todo+0x692/0x106c net/core/dev.c:11713 rtnl_unlock net/core/rtnetlink.c:157 [inline] rtnl_net_unlock include/linux/rtnetlink.h:135 [inline] rtnl_dellink+0x394/0x9f0 net/core/rtnetlink.c:3578 rtnetlink_rcv_msg+0x8e2/0xd84 net/core/rtnetlink.c:6958 netlink_rcv_skb+0x1e8/0x394 net/netlink/af_netlink.c:2550 rtnetlink_rcv+0x26/0x30 net/core/rtnetlink.c:6985 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x50c/0x7d8 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x7e0/0xd64 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0xca/0x160 net/socket.c:742 ____sys_sendmsg+0x636/0x794 net/socket.c:2592 ___sys_sendmsg+0x1a4/0x1e8 net/socket.c:2646 __sys_sendmsg+0x18e/0x234 net/socket.c:2678 __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __riscv_sys_sendmsg+0x70/0xa4 net/socket.c:2681 syscall_handler+0x92/0x114 arch/riscv/include/asm/syscall.h:112 do_trap_ecall_u+0x3d2/0x58c arch/riscv/kernel/traps.c:344 handle_exception+0x15e/0x16a arch/riscv/kernel/entry.S:232 The buggy address belongs to the object at ffffaf801c944000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 744 bytes inside of freed 4096-byte region [ffffaf801c944000, ffffaf801c945000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9c940 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xffe000000000040(head|node=0|zone=0|lastcpupid=0x7ff) page_type: f5(slab) raw: 0ffe000000000040 ffffaf80118093c0 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000040004 00000000f5000000 0000000000000000 head: 0ffe000000000040 ffffaf80118093c0 dead000000000122 0000000000000000 head: 0000000000000000 0000000000040004 00000000f5000000 0000000000000000 head: 0ffe000000000003 ffff8d8000725001 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 3202, tgid 3202 (syz-executor), ts 758888967100, free_ts 758778709800 __set_page_owner+0x92/0x4b0 mm/page_owner.c:341 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0xe6/0x1d8 mm/page_alloc.c:1884 prep_new_page mm/page_alloc.c:1892 [inline] get_page_from_freelist+0xfbc/0x3ab8 mm/page_alloc.c:3945 __alloc_frozen_pages_noprof+0x216/0x20c8 mm/page_alloc.c:5240 alloc_pages_mpol+0x1f0/0x598 mm/mempolicy.c:2486 alloc_frozen_pages_noprof+0x154/0x2c8 mm/mempolicy.c:2557 alloc_slab_page mm/slub.c:3075 [inline] allocate_slab mm/slub.c:3248 [inline] new_slab+0x35a/0x418 mm/slub.c:3302 ___slab_alloc+0xc80/0x17f0 mm/slub.c:4656 __slab_alloc.isra.0+0x6c/0x110 mm/slub.c:4779 __slab_alloc_node mm/slub.c:4855 [inline] slab_alloc_node mm/slub.c:5251 [inline] __do_kmalloc_node mm/slub.c:5656 [inline] __kmalloc_node_track_caller_noprof+0x42c/0xa8c mm/slub.c:5768 kmemdup_noprof+0x30/0x64 mm/util.c:138 __addrconf_sysctl_register+0xcc/0x364 net/ipv6/addrconf.c:7305 addrconf_sysctl_register net/ipv6/addrconf.c:7371 [inline] addrconf_sysctl_register+0x156/0x1d8 net/ipv6/addrconf.c:7360 ipv6_add_dev+0xa18/0x15b4 net/ipv6/addrconf.c:460 addrconf_notify+0x564/0x184c net/ipv6/addrconf.c:3650 notifier_call_chain+0x94/0x5ec kernel/notifier.c:85 page last free pid 3202 tgid 3202 stack trace: __reset_page_owner+0x76/0x1bc mm/page_owner.c:320 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1433 [inline] __free_frozen_pages+0x7f8/0x1480 mm/page_alloc.c:2973 free_frozen_pages+0xe/0x18 mm/page_alloc.c:3011 __free_slab+0xb6/0x154 mm/slub.c:3317 free_slab+0x24/0x178 mm/slub.c:3340 discard_slab mm/slub.c:3346 [inline] __put_partials+0x120/0x184 mm/slub.c:3886 put_cpu_partial+0x188/0x344 mm/slub.c:3961 __slab_free+0x27c/0x2bc mm/slub.c:5956 do_slab_free mm/slub.c:6622 [inline] ___cache_free+0x176/0x1ac mm/slub.c:6741 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x68/0x13c mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x156/0x1bc mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x5c/0x84 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4953 [inline] slab_alloc_node mm/slub.c:5263 [inline] __kmalloc_cache_noprof+0x1ea/0x878 mm/slub.c:5775 kmalloc_noprof include/linux/slab.h:957 [inline] kzalloc_noprof include/linux/slab.h:1094 [inline] kset_create lib/kobject.c:965 [inline] kset_create_and_add+0x56/0x180 lib/kobject.c:1008 register_queue_kobjects net/core/net-sysfs.c:2106 [inline] netdev_register_kobject+0x186/0x32c net/core/net-sysfs.c:2362 register_netdevice+0x1140/0x219c net/core/dev.c:11406 Memory state around the buggy address: ffffaf801c944180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffffaf801c944200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffffaf801c944280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffffaf801c944300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffffaf801c944380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================