================================================================== BUG: KASAN: slab-use-after-free in __ethtool_get_link_ksettings+0x6e/0x140 net/ethtool/ioctl.c:441 Read of size 8 at addr ffff88807897c308 by task kworker/0:0/27069 CPU: 0 PID: 27069 Comm: kworker/0:0 Not tainted 6.8.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Workqueue: infiniband ib_cache_event_task Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0x167/0x540 mm/kasan/report.c:488 kasan_report+0x142/0x180 mm/kasan/report.c:601 __ethtool_get_link_ksettings+0x6e/0x140 net/ethtool/ioctl.c:441 ib_get_eth_speed+0x160/0x800 drivers/infiniband/core/verbs.c:1984 rxe_query_port+0x76/0x260 drivers/infiniband/sw/rxe/rxe_verbs.c:55 __ib_query_port drivers/infiniband/core/device.c:2060 [inline] ib_query_port+0x168/0x7d0 drivers/infiniband/core/device.c:2092 ib_cache_update+0x1a9/0xb80 drivers/infiniband/core/cache.c:1498 ib_cache_event_task+0xf3/0x1e0 drivers/infiniband/core/cache.c:1572 process_one_work kernel/workqueue.c:2633 [inline] process_scheduled_works+0x915/0x1420 kernel/workqueue.c:2706 worker_thread+0xa5f/0x1000 kernel/workqueue.c:2787 kthread+0x2f1/0x390 kernel/kthread.c:388 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243 Allocated by task 5108: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:372 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:389 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:3981 [inline] __kmalloc_node+0x24e/0x4e0 mm/slub.c:3988 kmalloc_node include/linux/slab.h:610 [inline] kvmalloc_node+0x72/0x190 mm/util.c:617 kvmalloc include/linux/slab.h:728 [inline] kvzalloc include/linux/slab.h:736 [inline] alloc_netdev_mqs+0x9d/0xf80 net/core/dev.c:10826 rtnl_create_link+0x2f9/0xc20 net/core/rtnetlink.c:3382 rtnl_newlink_create net/core/rtnetlink.c:3508 [inline] __rtnl_newlink net/core/rtnetlink.c:3738 [inline] rtnl_newlink+0x1421/0x20a0 net/core/rtnetlink.c:3751 rtnetlink_rcv_msg+0x887/0x1040 net/core/rtnetlink.c:6618 netlink_rcv_skb+0x1e5/0x430 net/netlink/af_netlink.c:2543 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline] netlink_unicast+0x7ec/0x980 net/netlink/af_netlink.c:1367 netlink_sendmsg+0xa3b/0xd70 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x223/0x270 net/socket.c:745 __sys_sendto+0x3a4/0x4f0 net/socket.c:2191 __do_sys_sendto net/socket.c:2203 [inline] __se_sys_sendto net/socket.c:2199 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2199 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 Freed by task 1053: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x4e/0x60 mm/kasan/generic.c:643 poison_slab_object+0xa6/0xe0 mm/kasan/common.c:241 __kasan_slab_free+0x34/0x70 mm/kasan/common.c:257 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2121 [inline] slab_free mm/slub.c:4299 [inline] kfree+0x14a/0x380 mm/slub.c:4409 device_release+0x9b/0x1c0 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x231/0x480 lib/kobject.c:737 netdev_run_todo+0xe2f/0xf40 net/core/dev.c:10581 default_device_exit_batch+0x95a/0x9d0 net/core/dev.c:11620 ops_exit_list net/core/net_namespace.c:175 [inline] cleanup_net+0x777/0xb90 net/core/net_namespace.c:618 process_one_work kernel/workqueue.c:2633 [inline] process_scheduled_works+0x915/0x1420 kernel/workqueue.c:2706 worker_thread+0xa5f/0x1000 kernel/workqueue.c:2787 kthread+0x2f1/0x390 kernel/kthread.c:388 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243 The buggy address belongs to the object at ffff88807897c000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 776 bytes inside of freed 4096-byte region [ffff88807897c000, ffff88807897d000) The buggy address belongs to the physical page: page:ffffea0001e25e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x78978 head:ffffea0001e25e00 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888014c4f500 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000040004 00000001ffffffff 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5108, tgid 5108 (syz-executor.3), ts 122226225741, free_ts 122214278951 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1ea/0x210 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0x33ea/0x3580 mm/page_alloc.c:3311 __alloc_pages+0x255/0x680 mm/page_alloc.c:4567 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page+0x5f/0x160 mm/slub.c:2190 allocate_slab mm/slub.c:2354 [inline] new_slab+0x84/0x2f0 mm/slub.c:2407 ___slab_alloc+0xd17/0x13e0 mm/slub.c:3540 __slab_alloc mm/slub.c:3625 [inline] __slab_alloc_node mm/slub.c:3678 [inline] slab_alloc_node mm/slub.c:3850 [inline] kmalloc_trace+0x264/0x360 mm/slub.c:4007 kmalloc include/linux/slab.h:590 [inline] kzalloc include/linux/slab.h:711 [inline] snmp6_alloc_dev net/ipv6/addrconf.c:356 [inline] ipv6_add_dev+0x5bd/0x1290 net/ipv6/addrconf.c:406 addrconf_notify+0x6a7/0x1020 net/ipv6/addrconf.c:3608 notifier_call_chain+0x191/0x3b0 kernel/notifier.c:93 call_netdevice_notifiers_extack net/core/dev.c:2004 [inline] call_netdevice_notifiers net/core/dev.c:2018 [inline] register_netdevice+0x151f/0x19c0 net/core/dev.c:10294 virt_wifi_newlink+0x3ba/0x7c0 drivers/net/wireless/virtual/virt_wifi.c:553 rtnl_newlink_create net/core/rtnetlink.c:3518 [inline] __rtnl_newlink net/core/rtnetlink.c:3738 [inline] rtnl_newlink+0x1591/0x20a0 net/core/rtnetlink.c:3751 rtnetlink_rcv_msg+0x887/0x1040 net/core/rtnetlink.c:6618 netlink_rcv_skb+0x1e5/0x430 net/netlink/af_netlink.c:2543 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline] netlink_unicast+0x7ec/0x980 net/netlink/af_netlink.c:1367 page last free pid 5095 tgid 5095 stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1140 [inline] free_unref_page_prepare+0x968/0xa90 mm/page_alloc.c:2346 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2486 __slab_free+0x349/0x410 mm/slub.c:4211 qlink_free mm/kasan/quarantine.c:160 [inline] qlist_free_all+0x6d/0xd0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:324 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3813 [inline] slab_alloc_node mm/slub.c:3860 [inline] kmalloc_trace+0x16a/0x360 mm/slub.c:4007 kmalloc include/linux/slab.h:590 [inline] rtnl_newlink+0xf2/0x20a0 net/core/rtnetlink.c:3747 rtnetlink_rcv_msg+0x887/0x1040 net/core/rtnetlink.c:6618 netlink_rcv_skb+0x1e5/0x430 net/netlink/af_netlink.c:2543 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline] netlink_unicast+0x7ec/0x980 net/netlink/af_netlink.c:1367 netlink_sendmsg+0xa3b/0xd70 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x223/0x270 net/socket.c:745 __sys_sendto+0x3a4/0x4f0 net/socket.c:2191 __do_sys_sendto net/socket.c:2203 [inline] __se_sys_sendto net/socket.c:2199 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2199 do_syscall_64+0xfb/0x240 Memory state around the buggy address: ffff88807897c200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807897c280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807897c300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807897c380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807897c400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================