================================================================== BUG: KASAN: slab-use-after-free in __ethtool_get_link_ksettings+0x6e/0x140 net/ethtool/ioctl.c:441 Read of size 8 at addr ffff88805e192308 by task kworker/1:7/23699 CPU: 1 PID: 23699 Comm: kworker/1:7 Not tainted 6.8.0-syzkaller-05204-g237bb5f7f7f5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024 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+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 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 siw_query_port+0x4a/0x440 drivers/infiniband/sw/siw/siw_verbs.c:179 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:3254 [inline] process_scheduled_works+0xa00/0x1770 kernel/workqueue.c:3335 worker_thread+0x86d/0xd70 kernel/workqueue.c:3416 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 Allocated by task 5738: 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:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:3981 [inline] __kmalloc_node+0x251/0x4e0 mm/slub.c:3988 kmalloc_node include/linux/slab.h:610 [inline] kvmalloc_node+0x72/0x190 mm/util.c:634 kvmalloc include/linux/slab.h:728 [inline] kvzalloc include/linux/slab.h:736 [inline] alloc_netdev_mqs+0x9d/0xf80 net/core/dev.c:10840 rtnl_create_link+0x2f9/0xc20 net/core/rtnetlink.c:3358 rtnl_newlink_create net/core/rtnetlink.c:3484 [inline] __rtnl_newlink net/core/rtnetlink.c:3714 [inline] rtnl_newlink+0x1421/0x20a0 net/core/rtnetlink.c:3727 rtnetlink_rcv_msg+0x89b/0x10d0 net/core/rtnetlink.c:6595 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2559 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline] netlink_unicast+0x7ea/0x980 net/netlink/af_netlink.c:1361 netlink_sendmsg+0x8e1/0xcb0 net/netlink/af_netlink.c:1905 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 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+0x6d/0x75 Freed by task 50: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:589 poison_slab_object+0xa6/0xe0 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 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+0x99/0x1c0 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x22f/0x480 lib/kobject.c:737 netdev_run_todo+0xe79/0x1000 net/core/dev.c:10591 default_device_exit_batch+0x975/0x9f0 net/core/dev.c:11632 ops_exit_list net/core/net_namespace.c:175 [inline] cleanup_net+0x89d/0xcc0 net/core/net_namespace.c:637 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0xa00/0x1770 kernel/workqueue.c:3335 worker_thread+0x86d/0xd70 kernel/workqueue.c:3416 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 The buggy address belongs to the object at ffff88805e192000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 776 bytes inside of freed 4096-byte region [ffff88805e192000, ffff88805e193000) The buggy address belongs to the physical page: page:ffffea0001786400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5e190 head:ffffea0001786400 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff888023195681 flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888014c4f500 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000040004 00000001ffffffff ffff888023195681 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 5738, tgid 5738 (syz-executor.0), ts 1555558034554, free_ts 1555526290561 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+0x256/0x680 mm/page_alloc.c:4569 __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+0xd1b/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] __do_kmalloc_node mm/slub.c:3980 [inline] __kmalloc_node_track_caller+0x2d4/0x4e0 mm/slub.c:4001 kmemdup+0x2a/0x60 mm/util.c:131 __addrconf_sysctl_register+0xb1/0x3f0 net/ipv6/addrconf.c:7196 addrconf_sysctl_register+0x167/0x1c0 net/ipv6/addrconf.c:7262 ipv6_add_dev+0xcff/0x1220 net/ipv6/addrconf.c:455 addrconf_notify+0x6a7/0x1020 net/ipv6/addrconf.c:3650 notifier_call_chain+0x18f/0x3b0 kernel/notifier.c:93 call_netdevice_notifiers_extack net/core/dev.c:1988 [inline] call_netdevice_notifiers net/core/dev.c:2002 [inline] register_netdevice+0x15b2/0x1a20 net/core/dev.c:10307 virt_wifi_newlink+0x3ba/0x7c0 drivers/net/wireless/virtual/virt_wifi.c:553 rtnl_newlink_create net/core/rtnetlink.c:3494 [inline] __rtnl_newlink net/core/rtnetlink.c:3714 [inline] rtnl_newlink+0x158f/0x20a0 net/core/rtnetlink.c:3727 page last free pid 5922 tgid 5921 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 page_to_skb+0x3dc/0x9b0 drivers/net/virtio_net.c:621 receive_mergeable drivers/net/virtio_net.c:1683 [inline] receive_buf+0x3b3/0x3890 drivers/net/virtio_net.c:1804 virtnet_receive drivers/net/virtio_net.c:2110 [inline] virtnet_poll+0x720/0x18f0 drivers/net/virtio_net.c:2203 __napi_poll+0xcb/0x490 net/core/dev.c:6632 napi_poll net/core/dev.c:6701 [inline] net_rx_action+0x7bb/0x1090 net/core/dev.c:6813 __do_softirq+0x2bc/0x943 kernel/softirq.c:554 Memory state around the buggy address: ffff88805e192200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805e192280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88805e192300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805e192380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805e192400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================