================================================================== BUG: KASAN: slab-use-after-free in __ethtool_get_link_ksettings+0x78/0x174 net/ethtool/ioctl.c:443 Read of size 8 at addr ffff0000cea7c2e8 by task kworker/0:2/2314 CPU: 0 UID: 0 PID: 2314 Comm: kworker/0:2 Not tainted 6.16.0-rc2-syzkaller-g9aa9b43d689e #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: events smc_ib_port_event_work Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:501 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 print_address_description+0xa8/0x254 mm/kasan/report.c:408 print_report+0x68/0x84 mm/kasan/report.c:521 kasan_report+0xb0/0x110 mm/kasan/report.c:634 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 __ethtool_get_link_ksettings+0x78/0x174 net/ethtool/ioctl.c:443 ipvlan_ethtool_get_link_ksettings+0x48/0x58 drivers/net/ipvlan/ipvlan_main.c:411 __ethtool_get_link_ksettings+0x130/0x174 net/ethtool/ioctl.c:450 ib_get_eth_speed+0x148/0x6a4 drivers/infiniband/core/verbs.c:1996 rxe_query_port+0x98/0x350 drivers/infiniband/sw/rxe/rxe_verbs.c:62 __ib_query_port drivers/infiniband/core/device.c:2111 [inline] ib_query_port+0x150/0x758 drivers/infiniband/core/device.c:2143 smc_ib_remember_port_attr net/smc/smc_ib.c:364 [inline] smc_ib_port_event_work+0x118/0x8e0 net/smc/smc_ib.c:388 process_one_work+0x7e8/0x155c kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3321 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3402 kthread+0x5fc/0x75c kernel/kthread.c:464 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:847 Allocated by task 6528: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_alloc_info+0x44/0x54 mm/kasan/generic.c:562 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0x9c/0xb4 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4328 [inline] __kvmalloc_node_noprof+0x38c/0x638 mm/slub.c:5015 alloc_netdev_mqs+0xa8/0xe50 net/core/dev.c:11711 rtnl_create_link+0x2ac/0xb38 net/core/rtnetlink.c:3631 rtnl_newlink_create+0x20c/0x9ac net/core/rtnetlink.c:3813 __rtnl_newlink net/core/rtnetlink.c:3940 [inline] rtnl_newlink+0x1194/0x15dc net/core/rtnetlink.c:4055 rtnetlink_rcv_msg+0x664/0x97c net/core/rtnetlink.c:6944 netlink_rcv_skb+0x220/0x3fc net/netlink/af_netlink.c:2534 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6971 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x60c/0x824 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x648/0x930 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg net/socket.c:727 [inline] __sys_sendto+0x36c/0x4f4 net/socket.c:2180 __do_sys_sendto net/socket.c:2187 [inline] __se_sys_sendto net/socket.c:2183 [inline] __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2183 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Freed by task 6704: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_free_info+0x58/0x70 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x68/0x88 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+0x17c/0x474 mm/slub.c:4842 kvfree+0x30/0x40 mm/slub.c:5058 netdev_release+0x88/0xb0 net/core/net-sysfs.c:2231 device_release+0x8c/0x1ac drivers/base/core.c:-1 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x2b0/0x438 lib/kobject.c:737 netdev_run_todo+0xb84/0xd24 net/core/dev.c:11412 rtnl_unlock+0x14/0x20 net/core/rtnetlink.c:157 default_device_exit_batch+0x83c/0x8b4 net/core/dev.c:12645 ops_exit_list net/core/net_namespace.c:206 [inline] ops_undo_list+0x428/0x7ec net/core/net_namespace.c:253 cleanup_net+0x3e4/0x6c0 net/core/net_namespace.c:686 process_one_work+0x7e8/0x155c kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3321 [inline] worker_thread+0x958/0xed8 kernel/workqueue.c:3402 kthread+0x5fc/0x75c kernel/kthread.c:464 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:847 The buggy address belongs to the object at ffff0000cea7c000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 744 bytes inside of freed 4096-byte region [ffff0000cea7c000, ffff0000cea7d000) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10ea78 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000040 ffff0000c000b500 fffffdffc33af000 dead000000000002 raw: 0000000000000000 0000000000040004 00000000f5000000 0000000000000000 head: 05ffc00000000040 ffff0000c000b500 fffffdffc33af000 dead000000000002 head: 0000000000000000 0000000000040004 00000000f5000000 0000000000000000 head: 05ffc00000000003 fffffdffc33a9e01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000cea7c180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000cea7c200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000cea7c280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000cea7c300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000cea7c380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================