================================================================== BUG: KASAN: slab-use-after-free in __ethtool_get_link_ksettings+0x13c/0x164 net/ethtool/ioctl.c:443 Read of size 8 at addr ffff0000206ea2e8 by task kworker/0:2/17794 CPU: 0 UID: 0 PID: 17794 Comm: kworker/0:2 Not tainted syzkaller #0 PREEMPT Hardware name: linux,dummy-virt (DT) Workqueue: events smc_ib_port_event_work Call trace: show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xa4/0xf4 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xf4/0x5a0 mm/kasan/report.c:482 kasan_report+0xc8/0x108 mm/kasan/report.c:595 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 __ethtool_get_link_ksettings+0x13c/0x164 net/ethtool/ioctl.c:443 ipvlan_ethtool_get_link_ksettings+0x34/0x54 drivers/net/ipvlan/ipvlan_main.c:411 __ethtool_get_link_ksettings+0xd4/0x164 net/ethtool/ioctl.c:450 ib_get_eth_speed+0xe8/0x908 drivers/infiniband/core/verbs.c:1996 rxe_query_port+0xec/0x298 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+0x300/0x5f4 drivers/infiniband/core/device.c:2170 smc_ib_remember_port_attr net/smc/smc_ib.c:364 [inline] smc_ib_port_event_work+0x104/0x8f8 net/smc/smc_ib.c:388 process_one_work+0x7cc/0x18d4 kernel/workqueue.c:3236 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x734/0xb84 kernel/workqueue.c:3400 kthread+0x348/0x5fc kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Allocated by task 3320: kasan_save_stack+0x3c/0x64 mm/kasan/common.c:47 kasan_save_track+0x20/0x3c mm/kasan/common.c:68 kasan_save_alloc_info+0x40/0x54 mm/kasan/generic.c:562 poison_kmalloc_redzone mm/kasan/common.c:388 [inline] __kasan_kmalloc+0xb8/0xbc mm/kasan/common.c:405 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4376 [inline] __kvmalloc_node_noprof+0x268/0x648 mm/slub.c:5067 alloc_netdev_mqs+0x6c/0xfc4 net/core/dev.c:11812 rtnl_create_link+0x904/0xc18 net/core/rtnetlink.c:3633 rtnl_newlink_create net/core/rtnetlink.c:3815 [inline] __rtnl_newlink net/core/rtnetlink.c:3942 [inline] rtnl_newlink+0x9bc/0x1810 net/core/rtnetlink.c:4057 rtnetlink_rcv_msg+0x65c/0x8d4 net/core/rtnetlink.c:6946 netlink_rcv_skb+0x19c/0x338 net/netlink/af_netlink.c:2552 rtnetlink_rcv+0x18/0x24 net/core/rtnetlink.c:6973 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x424/0x700 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x644/0xa54 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0xc8/0x168 net/socket.c:729 __sys_sendto+0x1d8/0x270 net/socket.c:2228 __do_sys_sendto net/socket.c:2235 [inline] __se_sys_sendto net/socket.c:2231 [inline] __arm64_sys_sendto+0xc0/0x134 net/socket.c:2231 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x6c/0x258 arch/arm64/kernel/syscall.c:49 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:132 do_el0_svc_compat+0x40/0x68 arch/arm64/kernel/syscall.c:157 el0_svc_compat+0x4c/0x184 arch/arm64/kernel/entry-common.c:1029 el0t_32_sync_handler+0x88/0xac arch/arm64/kernel/entry-common.c:1047 el0t_32_sync+0x19c/0x1a0 arch/arm64/kernel/entry.S:601 Freed by task 11507: kasan_save_stack+0x3c/0x64 mm/kasan/common.c:47 kasan_save_track+0x20/0x3c mm/kasan/common.c:68 kasan_save_free_info+0x4c/0x74 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:243 [inline] __kasan_slab_free+0x58/0x78 mm/kasan/common.c:275 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2422 [inline] slab_free mm/slub.c:4695 [inline] kfree+0x1bc/0x444 mm/slub.c:4894 kvfree+0x3c/0x4c mm/slub.c:5110 netdev_release+0x70/0x98 net/core/net-sysfs.c:2250 device_release+0xe4/0x1e8 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+0x17c/0x430 lib/kobject.c:737 netdev_run_todo+0x570/0xd38 net/core/dev.c:11513 rtnl_unlock+0x10/0x1c net/core/rtnetlink.c:157 default_device_exit_batch+0x614/0x888 net/core/dev.c:12734 ops_exit_list net/core/net_namespace.c:204 [inline] ops_undo_list+0x31c/0x71c net/core/net_namespace.c:251 cleanup_net+0x31c/0x724 net/core/net_namespace.c:682 process_one_work+0x7cc/0x18d4 kernel/workqueue.c:3236 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x734/0xb84 kernel/workqueue.c:3400 kthread+0x348/0x5fc kernel/kthread.c:463 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 The buggy address belongs to the object at ffff0000206ea000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 744 bytes inside of freed 4096-byte region [ffff0000206ea000, ffff0000206eb000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x606e8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x1ffc00000000040(head|node=0|zone=0|lastcpupid=0x7ff) page_type: f5(slab) raw: 01ffc00000000040 ffff00000dc0b500 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000040004 00000000f5000000 0000000000000000 head: 01ffc00000000040 ffff00000dc0b500 dead000000000100 dead000000000122 head: 0000000000000000 0000000000040004 00000000f5000000 0000000000000000 head: 01ffc00000000003 fffffdffc081ba01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000206ea180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000206ea200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000206ea280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000206ea300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000206ea380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================