================================================================== BUG: KASAN: slab-use-after-free in __ethtool_get_link_ksettings+0x182/0x198 net/ethtool/ioctl.c:443 Read of size 8 at addr ffffaf80190282e8 by task kworker/1:0/5670 CPU: 1 UID: 0 PID: 5670 Comm: kworker/1:0 Not tainted syzkaller #0 PREEMPT Hardware name: riscv-virtio,qemu (DT) Workqueue: events smc_ib_port_event_work 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:378 [inline] [] print_report+0x28e/0x5a2 mm/kasan/report.c:482 [] kasan_report+0xf0/0x214 mm/kasan/report.c:595 [] __asan_report_load8_noabort+0x12/0x1a mm/kasan/report_generic.c:381 [] __ethtool_get_link_ksettings+0x182/0x198 net/ethtool/ioctl.c:443 [] ipvlan_ethtool_get_link_ksettings+0x46/0x5c drivers/net/ipvlan/ipvlan_main.c:411 [] __ethtool_get_link_ksettings+0xf8/0x198 net/ethtool/ioctl.c:450 [] ib_get_eth_speed+0x13a/0xb9c drivers/infiniband/core/verbs.c:1996 [] rxe_query_port+0x124/0x2e6 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+0x3f2/0x862 drivers/infiniband/core/device.c:2170 [] smc_ib_remember_port_attr net/smc/smc_ib.c:364 [inline] [] smc_ib_port_event_work+0x140/0xb88 net/smc/smc_ib.c:388 [] process_one_work+0x96a/0x1f32 kernel/workqueue.c:3236 [] process_scheduled_works kernel/workqueue.c:3319 [inline] [] worker_thread+0x5ce/0xde8 kernel/workqueue.c:3400 [] kthread+0x39c/0x7d4 kernel/kthread.c:463 [] ret_from_fork_kernel+0x2a/0xbb4 arch/riscv/kernel/process.c:214 [] ret_from_fork_kernel_asm+0x16/0x18 arch/riscv/kernel/entry.S:327 Allocated by task 3209: 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:388 [inline] __kasan_kmalloc+0xa0/0xa6 mm/kasan/common.c:405 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4365 [inline] __kvmalloc_node_noprof+0x27a/0x6ac mm/slub.c:5052 alloc_netdev_mqs+0xcc/0x1204 net/core/dev.c:11795 rtnl_create_link+0xb2a/0xe54 net/core/rtnetlink.c:3633 rtnl_newlink_create net/core/rtnetlink.c:3815 [inline] __rtnl_newlink net/core/rtnetlink.c:3942 [inline] rtnl_newlink+0xb54/0x1d78 net/core/rtnetlink.c:4057 rtnetlink_rcv_msg+0x9e2/0xdbe net/core/rtnetlink.c:6946 netlink_rcv_skb+0x206/0x3be net/netlink/af_netlink.c:2552 rtnetlink_rcv+0x26/0x30 net/core/rtnetlink.c:6973 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x544/0x88a net/netlink/af_netlink.c:1346 netlink_sendmsg+0x860/0xdd8 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0xcc/0x160 net/socket.c:729 __sys_sendto+0x27a/0x34e net/socket.c:2228 __do_sys_sendto net/socket.c:2235 [inline] __se_sys_sendto net/socket.c:2231 [inline] __riscv_sys_sendto+0xc0/0x158 net/socket.c:2231 syscall_handler+0x94/0x118 arch/riscv/include/asm/syscall.h:112 do_trap_ecall_u+0x396/0x530 arch/riscv/kernel/traps.c:343 handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:197 Freed by task 3256: 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:243 [inline] __kasan_slab_free+0x4a/0x62 mm/kasan/common.c:275 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2417 [inline] slab_free mm/slub.c:4680 [inline] kfree+0x252/0x4da mm/slub.c:4879 kvfree+0x28/0x32 mm/slub.c:5095 netdev_release+0x84/0xb0 net/core/net-sysfs.c:2250 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+0x238/0x4f0 lib/kobject.c:737 netdev_run_todo+0x6a6/0x10b4 net/core/dev.c:11496 rtnl_unlock+0x14/0x1c net/core/rtnetlink.c:157 default_device_exit_batch+0x67c/0x8b0 net/core/dev.c:12716 ops_exit_list net/core/net_namespace.c:204 [inline] ops_undo_list+0x3e8/0x9dc net/core/net_namespace.c:251 cleanup_net+0x3e0/0x7ce net/core/net_namespace.c:682 process_one_work+0x96a/0x1f32 kernel/workqueue.c:3236 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x5ce/0xde8 kernel/workqueue.c:3400 kthread+0x39c/0x7d4 kernel/kthread.c:463 ret_from_fork_kernel+0x2a/0xbb4 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 ffffaf8019028000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 744 bytes inside of freed 4096-byte region [ffffaf8019028000, ffffaf8019029000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x99028 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 ffff8d8000640a01 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 0xd60c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3209, tgid 3209 (syz-executor), ts 538218846500, free_ts 538196029800 __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:1851 prep_new_page mm/page_alloc.c:1859 [inline] get_page_from_freelist+0x7fa/0x359a mm/page_alloc.c:3858 __alloc_frozen_pages_noprof+0x22e/0x2120 mm/page_alloc.c:5148 alloc_pages_mpol+0x1fa/0x5bc mm/mempolicy.c:2416 alloc_frozen_pages_noprof+0x174/0x2f0 mm/mempolicy.c:2487 alloc_slab_page mm/slub.c:2487 [inline] allocate_slab mm/slub.c:2655 [inline] new_slab+0x27c/0x38c mm/slub.c:2709 ___slab_alloc+0xb5a/0x1192 mm/slub.c:3891 __slab_alloc.constprop.0+0x60/0xb0 mm/slub.c:3981 __slab_alloc_node mm/slub.c:4056 [inline] slab_alloc_node mm/slub.c:4217 [inline] __do_kmalloc_node mm/slub.c:4364 [inline] __kvmalloc_node_noprof+0x1fe/0x6ac mm/slub.c:5052 alloc_netdev_mqs+0xcc/0x1204 net/core/dev.c:11795 rtnl_create_link+0xb2a/0xe54 net/core/rtnetlink.c:3633 rtnl_newlink_create net/core/rtnetlink.c:3815 [inline] __rtnl_newlink net/core/rtnetlink.c:3942 [inline] rtnl_newlink+0xb54/0x1d78 net/core/rtnetlink.c:4057 rtnetlink_rcv_msg+0x9e2/0xdbe net/core/rtnetlink.c:6946 netlink_rcv_skb+0x206/0x3be net/netlink/af_netlink.c:2552 rtnetlink_rcv+0x26/0x30 net/core/rtnetlink.c:6973 page last free pid 27 tgid 27 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:1395 [inline] __free_frozen_pages+0x836/0x145e mm/page_alloc.c:2895 free_frozen_pages+0xe/0x16 mm/page_alloc.c:2933 __free_slab+0xc0/0x18a mm/slub.c:2724 free_slab+0x3a/0x1b0 mm/slub.c:2747 discard_slab+0x42/0x5e mm/slub.c:2753 __slab_free+0x2de/0x32a mm/slub.c:4591 do_slab_free mm/slub.c:4632 [inline] ___cache_free+0x1a2/0x1dc mm/slub.c:4738 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:340 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4180 [inline] slab_alloc_node mm/slub.c:4229 [inline] kmem_cache_alloc_noprof+0x104/0x3bc mm/slub.c:4236 prepare_creds+0x36/0x76c kernel/cred.c:212 copy_creds+0xa0/0xacc kernel/cred.c:312 copy_process+0x1170/0x72ce kernel/fork.c:2038 kernel_clone+0x128/0xd9e kernel/fork.c:2605 Memory state around the buggy address: ffffaf8019028180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffffaf8019028200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffffaf8019028280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffffaf8019028300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffffaf8019028380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================