================================================================== BUG: KASAN: use-after-free in __ethtool_get_link_ksettings+0x6a/0x130 net/ethtool/ioctl.c:445 Read of size 8 at addr ffff8880756ee208 by task kworker/1:8/4061 CPU: 1 PID: 4061 Comm: kworker/1:8 Not tainted 6.1.90-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Workqueue: infiniband ib_cache_event_task Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15f/0x4f0 mm/kasan/report.c:395 kasan_report+0x136/0x160 mm/kasan/report.c:495 __ethtool_get_link_ksettings+0x6a/0x130 net/ethtool/ioctl.c:445 ib_get_eth_speed+0x151/0x510 drivers/infiniband/core/verbs.c:1898 rxe_query_port+0x5a/0x1a0 drivers/infiniband/sw/rxe/rxe_verbs.c:38 __ib_query_port drivers/infiniband/core/device.c:2067 [inline] ib_query_port+0x15f/0x7c0 drivers/infiniband/core/device.c:2099 ib_cache_update+0x1a8/0xaf0 drivers/infiniband/core/cache.c:1487 ib_cache_event_task+0xef/0x1e0 drivers/infiniband/core/cache.c:1561 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Allocated by task 4617: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:955 [inline] __kmalloc_node+0xb3/0x230 mm/slab_common.c:962 kmalloc_node include/linux/slab.h:582 [inline] kvmalloc_node+0x6e/0x180 mm/util.c:581 kvmalloc include/linux/slab.h:709 [inline] kvzalloc include/linux/slab.h:717 [inline] alloc_netdev_mqs+0x85/0xeb0 net/core/dev.c:10622 rtnl_create_link+0x2e9/0xa30 net/core/rtnetlink.c:3263 rtnl_newlink_create net/core/rtnetlink.c:3380 [inline] __rtnl_newlink net/core/rtnetlink.c:3610 [inline] rtnl_newlink+0x1403/0x2050 net/core/rtnetlink.c:3623 rtnetlink_rcv_msg+0x818/0xff0 net/core/rtnetlink.c:6121 netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2508 netlink_unicast_kernel net/netlink/af_netlink.c:1326 [inline] netlink_unicast+0x7d8/0x970 net/netlink/af_netlink.c:1352 netlink_sendmsg+0xa26/0xd60 net/netlink/af_netlink.c:1874 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] __sys_sendto+0x480/0x600 net/socket.c:2148 __do_sys_sendto net/socket.c:2160 [inline] __se_sys_sendto net/socket.c:2156 [inline] __x64_sys_sendto+0xda/0xf0 net/socket.c:2156 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Freed by task 46: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook mm/slub.c:1750 [inline] slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0x25c/0x3c0 mm/slub.c:3674 device_release+0x91/0x1c0 kobject_cleanup lib/kobject.c:681 [inline] kobject_release lib/kobject.c:712 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x224/0x460 lib/kobject.c:729 netdev_run_todo+0xe56/0xf40 net/core/dev.c:10412 default_device_exit_batch+0x95b/0x9d0 net/core/dev.c:11395 ops_exit_list net/core/net_namespace.c:174 [inline] cleanup_net+0x763/0xb60 net/core/net_namespace.c:601 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 The buggy address belongs to the object at ffff8880756ee000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 520 bytes inside of 4096-byte region [ffff8880756ee000, ffff8880756ef000) The buggy address belongs to the physical page: page:ffffea0001d5ba00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x756e8 head:ffffea0001d5ba00 order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff88802a342e01 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000001 ffff88801244c280 raw: 0000000000000000 0000000000040004 00000001ffffffff ffff88802a342e01 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 4391, tgid 4391 (syz-executor.0), ts 97758495910, free_ts 97741619921 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2513 prep_new_page mm/page_alloc.c:2520 [inline] get_page_from_freelist+0x31a1/0x3320 mm/page_alloc.c:4279 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5547 alloc_slab_page+0x6a/0x150 mm/slub.c:1794 allocate_slab mm/slub.c:1939 [inline] new_slab+0x84/0x2d0 mm/slub.c:1992 ___slab_alloc+0xc20/0x1270 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] __kmem_cache_alloc_node+0x19f/0x260 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:954 [inline] __kmalloc_node_track_caller+0xa0/0x220 mm/slab_common.c:975 kmemdup+0x26/0x60 mm/util.c:129 __addrconf_sysctl_register+0xad/0x3e0 net/ipv6/addrconf.c:7101 addrconf_sysctl_register+0x128/0x180 net/ipv6/addrconf.c:7166 ipv6_add_dev+0xb8e/0x1180 net/ipv6/addrconf.c:451 addrconf_notify+0x7a6/0xf60 net/ipv6/addrconf.c:3578 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0xd0/0x170 kernel/notifier.c:455 call_netdevice_notifiers_info net/core/dev.c:1970 [inline] call_netdevice_notifiers_extack net/core/dev.c:2008 [inline] call_netdevice_notifiers+0x145/0x1b0 net/core/dev.c:2022 register_netdevice+0x12f2/0x1720 net/core/dev.c:10132 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1440 [inline] free_pcp_prepare mm/page_alloc.c:1490 [inline] free_unref_page_prepare+0xf63/0x1120 mm/page_alloc.c:3358 free_unref_page+0x33/0x3e0 mm/page_alloc.c:3453 free_slab mm/slub.c:2031 [inline] discard_slab mm/slub.c:2037 [inline] __unfreeze_partials+0x1b7/0x210 mm/slub.c:2586 put_cpu_partial+0x17b/0x250 mm/slub.c:2662 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x156/0x170 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x1f/0x70 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x52/0x3a0 mm/slab.h:737 slab_alloc_node mm/slub.c:3398 [inline] slab_alloc mm/slub.c:3406 [inline] __kmem_cache_alloc_lru mm/slub.c:3413 [inline] kmem_cache_alloc+0x10c/0x2d0 mm/slub.c:3422 vm_area_dup+0x23/0x1b0 kernel/fork.c:466 dup_mmap kernel/fork.c:645 [inline] dup_mm kernel/fork.c:1540 [inline] copy_mm+0xed2/0x19c0 kernel/fork.c:1589 copy_process+0x19d5/0x4060 kernel/fork.c:2267 kernel_clone+0x222/0x920 kernel/fork.c:2682 __do_sys_clone kernel/fork.c:2823 [inline] __se_sys_clone kernel/fork.c:2807 [inline] __x64_sys_clone+0x231/0x280 kernel/fork.c:2807 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Memory state around the buggy address: ffff8880756ee100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880756ee180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880756ee200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880756ee280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880756ee300: fb fb fb fb fb fb fb fb fb fb fb 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