================================================================== BUG: KASAN: slab-use-after-free in __ethtool_get_link_ksettings+0x182/0x198 net/ethtool/ioctl.c:442 Read of size 8 at addr ffffaf80209302e8 by task kworker/0:3/5978 CPU: 0 UID: 0 PID: 5978 Comm: kworker/0:3 Not tainted 6.14.0-rc1-syzkaller-g245aece3750d #0 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/0x5aa mm/kasan/report.c:489 [] kasan_report+0xf0/0x214 mm/kasan/report.c:602 [] __asan_report_load8_noabort+0x12/0x1a mm/kasan/report_generic.c:381 [] __ethtool_get_link_ksettings+0x182/0x198 net/ethtool/ioctl.c:442 [] ipvlan_ethtool_get_link_ksettings+0x46/0x5c drivers/net/ipvlan/ipvlan_main.c:410 [] __ethtool_get_link_ksettings+0xf8/0x198 net/ethtool/ioctl.c:449 [] 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:2095 [inline] [] ib_query_port drivers/infiniband/core/device.c:2127 [inline] [] ib_query_port+0x3f2/0x862 drivers/infiniband/core/device.c:2117 [] 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/0x1f3a kernel/workqueue.c:3236 [] process_scheduled_works kernel/workqueue.c:3317 [inline] [] worker_thread+0x5be/0xdc6 kernel/workqueue.c:3398 [] kthread+0x37e/0x7b6 kernel/kthread.c:464 [] ret_from_fork+0xe/0x18 arch/riscv/kernel/entry.S:327 Allocated by task 8780: 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:4294 [inline] __kmalloc_node_noprof+0x25a/0x5ee mm/slub.c:4300 __kvmalloc_node_noprof+0xca/0x256 mm/util.c:662 alloc_netdev_mqs+0xcc/0x11de net/core/dev.c:11451 rtnl_create_link+0xb2c/0xe56 net/core/rtnetlink.c:3604 rtnl_newlink_create net/core/rtnetlink.c:3780 [inline] __rtnl_newlink net/core/rtnetlink.c:3906 [inline] rtnl_newlink+0x12c8/0x1acc net/core/rtnetlink.c:4021 rtnetlink_rcv_msg+0x9e2/0xdbe net/core/rtnetlink.c:6911 netlink_rcv_skb+0x216/0x3dc net/netlink/af_netlink.c:2543 rtnetlink_rcv+0x26/0x30 net/core/rtnetlink.c:6938 netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline] netlink_unicast+0x4f0/0x82c net/netlink/af_netlink.c:1348 netlink_sendmsg+0x864/0xdc6 net/netlink/af_netlink.c:1892 sock_sendmsg_nosec net/socket.c:713 [inline] __sock_sendmsg+0xcc/0x160 net/socket.c:728 __sys_sendto+0x27a/0x34c net/socket.c:2182 __do_sys_sendto net/socket.c:2189 [inline] __se_sys_sendto net/socket.c:2185 [inline] __riscv_sys_sendto+0xc0/0x158 net/socket.c:2185 syscall_handler+0x94/0x118 arch/riscv/include/asm/syscall.h:90 do_trap_ecall_u+0x1aa/0x216 arch/riscv/kernel/traps.c:331 handle_exception+0x146/0x152 arch/riscv/kernel/entry.S:197 Freed by task 7579: 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:2353 [inline] slab_free mm/slub.c:4609 [inline] kfree+0x256/0x50c mm/slub.c:4757 kvfree+0x66/0x7a mm/util.c:705 netdev_release+0x84/0xb0 net/core/net-sysfs.c:2065 device_release+0x90/0x21c drivers/base/core.c:2567 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:11166 rtnl_unlock+0x14/0x1c net/core/rtnetlink.c:151 default_device_exit_batch+0x67e/0x8b0 net/core/dev.c:12338 ops_exit_list+0xfc/0x158 net/core/net_namespace.c:177 cleanup_net+0x552/0xa16 net/core/net_namespace.c:652 process_one_work+0x96a/0x1f3a kernel/workqueue.c:3236 process_scheduled_works kernel/workqueue.c:3317 [inline] worker_thread+0x5be/0xdc6 kernel/workqueue.c:3398 kthread+0x37e/0x7b6 kernel/kthread.c:464 ret_from_fork+0xe/0x18 arch/riscv/kernel/entry.S:327 The buggy address belongs to the object at ffffaf8020930000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 744 bytes inside of freed 4096-byte region [ffffaf8020930000, ffffaf8020931000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffffaf8020934000 pfn:0xa0930 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffffaf8018e73541 flags: 0xffe000000000040(head|node=0|zone=0|lastcpupid=0x7ff) page_type: f5(slab) raw: 0ffe000000000040 ffffaf801140d3c0 ffff8d8000c56000 0000000000000002 raw: ffffaf8020934000 0000000000040002 00000000f5000000 ffffaf8018e73541 head: 0ffe000000000040 ffffaf801140d3c0 ffff8d8000c56000 0000000000000002 head: ffffaf8020934000 0000000000040002 00000000f5000000 ffffaf8018e73541 head: 0ffe000000000003 ffff8d8000824c01 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 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 8780, tgid 8780 (syz-executor), ts 3408923179900, free_ts 3408541240000 __set_page_owner+0xa2/0x710 mm/page_owner.c:320 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0xea/0x1e2 mm/page_alloc.c:1551 prep_new_page mm/page_alloc.c:1559 [inline] get_page_from_freelist+0xf78/0x2bd6 mm/page_alloc.c:3477 __alloc_frozen_pages_noprof+0x1e8/0x20fc mm/page_alloc.c:4739 alloc_pages_mpol+0x1fa/0x5b8 mm/mempolicy.c:2270 alloc_frozen_pages_noprof+0x174/0x2f0 mm/mempolicy.c:2341 alloc_slab_page mm/slub.c:2423 [inline] allocate_slab mm/slub.c:2587 [inline] new_slab+0x26a/0x340 mm/slub.c:2640 ___slab_alloc+0xaf4/0x1290 mm/slub.c:3826 __slab_alloc.constprop.0+0x60/0xb0 mm/slub.c:3916 __slab_alloc_node mm/slub.c:3991 [inline] slab_alloc_node mm/slub.c:4152 [inline] __do_kmalloc_node mm/slub.c:4293 [inline] __kmalloc_node_noprof+0x1de/0x5ee mm/slub.c:4300 __kvmalloc_node_noprof+0xca/0x256 mm/util.c:662 alloc_netdev_mqs+0xcc/0x11de net/core/dev.c:11451 rtnl_create_link+0xb2c/0xe56 net/core/rtnetlink.c:3604 rtnl_newlink_create net/core/rtnetlink.c:3780 [inline] __rtnl_newlink net/core/rtnetlink.c:3906 [inline] rtnl_newlink+0x12c8/0x1acc net/core/rtnetlink.c:4021 rtnetlink_rcv_msg+0x9e2/0xdbe net/core/rtnetlink.c:6911 netlink_rcv_skb+0x216/0x3dc net/netlink/af_netlink.c:2543 page last free pid 9126 tgid 9126 stack trace: __reset_page_owner+0x8c/0x400 mm/page_owner.c:297 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_frozen_pages+0x96a/0x155c mm/page_alloc.c:2660 __free_slab+0xcc/0x172 mm/slub.c:2655 free_slab+0x38/0x1ae mm/slub.c:2678 discard_slab mm/slub.c:2684 [inline] __put_partials+0x178/0x1e6 mm/slub.c:3153 put_cpu_partial+0x17c/0x296 mm/slub.c:3228 __slab_free+0x112/0x3fa mm/slub.c:4479 do_slab_free mm/slub.c:4561 [inline] ___cache_free+0x1a4/0x1de mm/slub.c:4667 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:4115 [inline] slab_alloc_node mm/slub.c:4164 [inline] kmem_cache_alloc_noprof+0x108/0x3e2 mm/slub.c:4171 getname_flags.part.0+0x50/0x4f6 fs/namei.c:139 getname_flags+0x98/0xe0 include/linux/audit.h:322 user_path_at+0x28/0x52 fs/namei.c:3071 user_statfs+0xa4/0x188 fs/statfs.c:103 Memory state around the buggy address: ffffaf8020930180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffffaf8020930200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffffaf8020930280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffffaf8020930300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffffaf8020930380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================