================================================================== BUG: KASAN: slab-use-after-free in __ethtool_get_link_ksettings+0x1bf/0x200 net/ethtool/ioctl.c:442 Read of size 8 at addr ffff8880511282e8 by task kworker/0:0/8 CPU: 0 UID: 0 PID: 8 Comm: kworker/0:0 Not tainted 6.13.0-rc2-syzkaller-00130-g150b567e0d57 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Workqueue: events smc_ib_port_event_work Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xc3/0x620 mm/kasan/report.c:489 kasan_report+0xd9/0x110 mm/kasan/report.c:602 __ethtool_get_link_ksettings+0x1bf/0x200 net/ethtool/ioctl.c:442 __ethtool_get_link_ksettings+0x145/0x200 net/ethtool/ioctl.c:449 ib_get_eth_speed+0x123/0xb50 drivers/infiniband/core/verbs.c:1996 rxe_query_port+0x72/0x200 drivers/infiniband/sw/rxe/rxe_verbs.c:55 __ib_query_port drivers/infiniband/core/device.c:2112 [inline] ib_query_port drivers/infiniband/core/device.c:2144 [inline] ib_query_port+0x447/0x8b0 drivers/infiniband/core/device.c:2134 smc_ib_remember_port_attr net/smc/smc_ib.c:364 [inline] smc_ib_port_event_work+0x122/0xb80 net/smc/smc_ib.c:388 process_one_work+0x958/0x1b30 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 6553: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4283 [inline] __kmalloc_node_noprof+0x21f/0x520 mm/slub.c:4289 __kvmalloc_node_noprof+0xad/0x1a0 mm/util.c:650 alloc_netdev_mqs+0xc9/0x1320 net/core/dev.c:11209 rtnl_create_link+0xbed/0xf10 net/core/rtnetlink.c:3595 rtnl_newlink_create net/core/rtnetlink.c:3771 [inline] __rtnl_newlink net/core/rtnetlink.c:3896 [inline] rtnl_newlink+0x14e3/0x1d70 net/core/rtnetlink.c:4011 rtnetlink_rcv_msg+0x95b/0xea0 net/core/rtnetlink.c:6921 netlink_rcv_skb+0x165/0x410 net/netlink/af_netlink.c:2542 netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline] netlink_unicast+0x53c/0x7f0 net/netlink/af_netlink.c:1347 netlink_sendmsg+0x8b8/0xd70 net/netlink/af_netlink.c:1891 sock_sendmsg_nosec net/socket.c:711 [inline] __sock_sendmsg net/socket.c:726 [inline] __sys_sendto+0x488/0x4f0 net/socket.c:2197 __do_compat_sys_socketcall+0x5e2/0x700 net/compat.c:475 do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline] __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e Freed by task 1142: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:582 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x51/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2338 [inline] slab_free mm/slub.c:4598 [inline] kfree+0x14f/0x4b0 mm/slub.c:4746 kvfree+0x47/0x50 mm/util.c:693 device_release+0xa1/0x240 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+0x1e4/0x5a0 lib/kobject.c:737 netdev_run_todo+0x7bc/0x12d0 net/core/dev.c:10924 default_device_exit_batch+0x745/0x9c0 net/core/dev.c:12074 ops_exit_list+0x128/0x180 net/core/net_namespace.c:177 cleanup_net+0x5b7/0xbd0 net/core/net_namespace.c:648 process_one_work+0x958/0x1b30 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 The buggy address belongs to the object at ffff888051128000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 744 bytes inside of freed 4096-byte region [ffff888051128000, ffff888051129000) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x51128 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff88805d191481 flags: 0x4fff00000000040(head|node=1|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 04fff00000000040 ffff88801ac50280 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000040004 00000001f5000000 ffff88805d191481 head: 04fff00000000040 ffff88801ac50280 dead000000000122 0000000000000000 head: 0000000000000000 0000000000040004 00000001f5000000 ffff88805d191481 head: 04fff00000000003 ffffea0001444a01 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 6553, tgid 6553 (syz-executor), ts 75670023365, free_ts 75664060121 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1556 prep_new_page mm/page_alloc.c:1564 [inline] get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3474 __alloc_pages_noprof+0x223/0x25b0 mm/page_alloc.c:4751 alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2269 alloc_slab_page mm/slub.c:2408 [inline] allocate_slab mm/slub.c:2574 [inline] new_slab+0x2c9/0x410 mm/slub.c:2627 ___slab_alloc+0xce2/0x1650 mm/slub.c:3815 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3905 __slab_alloc_node mm/slub.c:3980 [inline] slab_alloc_node mm/slub.c:4141 [inline] __do_kmalloc_node mm/slub.c:4282 [inline] __kmalloc_node_noprof+0x2f0/0x520 mm/slub.c:4289 __kvmalloc_node_noprof+0xad/0x1a0 mm/util.c:650 alloc_netdev_mqs+0xc9/0x1320 net/core/dev.c:11209 rtnl_create_link+0xbed/0xf10 net/core/rtnetlink.c:3595 rtnl_newlink_create net/core/rtnetlink.c:3771 [inline] __rtnl_newlink net/core/rtnetlink.c:3896 [inline] rtnl_newlink+0x14e3/0x1d70 net/core/rtnetlink.c:4011 rtnetlink_rcv_msg+0x95b/0xea0 net/core/rtnetlink.c:6921 netlink_rcv_skb+0x165/0x410 net/netlink/af_netlink.c:2542 netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline] netlink_unicast+0x53c/0x7f0 net/netlink/af_netlink.c:1347 netlink_sendmsg+0x8b8/0xd70 net/netlink/af_netlink.c:1891 page last free pid 6553 tgid 6553 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_unref_page+0x661/0x1080 mm/page_alloc.c:2657 __put_partials+0x14c/0x170 mm/slub.c:3142 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x120 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4104 [inline] slab_alloc_node mm/slub.c:4153 [inline] __kmalloc_cache_noprof+0x202/0x420 mm/slub.c:4309 kmalloc_noprof include/linux/slab.h:901 [inline] kzalloc_noprof include/linux/slab.h:1037 [inline] kobject_uevent_env+0x265/0x1670 lib/kobject_uevent.c:540 __kobject_del+0x168/0x1f0 lib/kobject.c:601 kobject_cleanup lib/kobject.c:680 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x327/0x5a0 lib/kobject.c:737 net_rx_queue_update_kobjects+0x478/0x5f0 net/core/net-sysfs.c:1178 netif_set_real_num_rx_queues+0x169/0x210 net/core/dev.c:2994 veth_init_queues+0x151/0x190 drivers/net/veth.c:1761 veth_newlink+0x416/0x8f0 drivers/net/veth.c:1856 rtnl_newlink_create net/core/rtnetlink.c:3786 [inline] __rtnl_newlink net/core/rtnetlink.c:3896 [inline] rtnl_newlink+0xbae/0x1d70 net/core/rtnetlink.c:4011 rtnetlink_rcv_msg+0x95b/0xea0 net/core/rtnetlink.c:6921 netlink_rcv_skb+0x165/0x410 net/netlink/af_netlink.c:2542 Memory state around the buggy address: ffff888051128180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888051128200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888051128280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888051128300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888051128380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================