================================================================== BUG: KASAN: slab-use-after-free in __ethtool_get_link_ksettings+0x1bf/0x200 net/ethtool/ioctl.c:442 Read of size 8 at addr ffff8880276ec2e8 by task kworker/2:0/25 CPU: 2 UID: 0 PID: 25 Comm: kworker/2:0 Not tainted 6.13.0-rc3-syzkaller-00136-g8faabc041a00 #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+0x43e/0x8a0 drivers/infiniband/core/device.c:2134 smc_ib_remember_port_attr net/smc/smc_ib.c:364 [inline] smc_ib_port_event_work+0x130/0xc00 net/smc/smc_ib.c:388 process_one_work+0x9c5/0x1ba0 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 5942: 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:4298 [inline] __kmalloc_node_noprof+0x21f/0x510 mm/slub.c:4304 __kvmalloc_node_noprof+0xad/0x1a0 mm/util.c:650 alloc_netdev_mqs+0xd9/0x1510 net/core/dev.c:11209 rtnl_create_link+0xc10/0xfa0 net/core/rtnetlink.c:3595 rtnl_newlink_create net/core/rtnetlink.c:3771 [inline] __rtnl_newlink net/core/rtnetlink.c:3897 [inline] rtnl_newlink+0x14c6/0x1d60 net/core/rtnetlink.c:4012 rtnetlink_rcv_msg+0x95b/0xea0 net/core/rtnetlink.c:6922 netlink_rcv_skb+0x16b/0x440 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_sys_sendto net/socket.c:2204 [inline] __se_sys_sendto net/socket.c:2200 [inline] __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2200 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 69: 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:2353 [inline] slab_free mm/slub.c:4613 [inline] kfree+0x14f/0x4b0 mm/slub.c:4761 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+0x86c/0xae0 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+0x9c5/0x1ba0 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 ffff8880276ec000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 744 bytes inside of freed 4096-byte region [ffff8880276ec000, ffff8880276ed000) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x276e8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801b050280 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000040004 00000001f5000000 0000000000000000 head: 00fff00000000040 ffff88801b050280 dead000000000122 0000000000000000 head: 0000000000000000 0000000000040004 00000001f5000000 0000000000000000 head: 00fff00000000003 ffffea00009dba01 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5935, tgid 5935 (syz-executor), ts 46646885733, free_ts 46588467019 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:2423 [inline] allocate_slab mm/slub.c:2589 [inline] new_slab+0x2c9/0x410 mm/slub.c:2642 ___slab_alloc+0xd7d/0x17a0 mm/slub.c:3830 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3920 __slab_alloc_node mm/slub.c:3995 [inline] slab_alloc_node mm/slub.c:4156 [inline] __do_kmalloc_node mm/slub.c:4297 [inline] __kmalloc_node_track_caller_noprof+0x2f1/0x510 mm/slub.c:4317 kmemdup_noprof+0x29/0x60 mm/util.c:135 kmemdup_noprof include/linux/fortify-string.h:765 [inline] __addrconf_sysctl_register+0xbc/0x360 net/ipv6/addrconf.c:7221 addrconf_sysctl_register net/ipv6/addrconf.c:7287 [inline] addrconf_sysctl_register+0x15f/0x1f0 net/ipv6/addrconf.c:7276 ipv6_add_dev+0xa6f/0x13f0 net/ipv6/addrconf.c:456 addrconf_notify+0x53e/0x19c0 net/ipv6/addrconf.c:3674 notifier_call_chain+0xb7/0x410 kernel/notifier.c:85 call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:1996 call_netdevice_notifiers_extack net/core/dev.c:2034 [inline] call_netdevice_notifiers net/core/dev.c:2048 [inline] register_netdevice+0x17a0/0x1e90 net/core/dev.c:10632 page last free pid 5935 tgid 5935 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:3157 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:4119 [inline] slab_alloc_node mm/slub.c:4168 [inline] kmem_cache_alloc_node_noprof+0x223/0x3c0 mm/slub.c:4220 __alloc_skb+0x2b1/0x380 net/core/skbuff.c:668 alloc_skb include/linux/skbuff.h:1323 [inline] netlink_alloc_large_skb+0x69/0x130 net/netlink/af_netlink.c:1196 netlink_sendmsg+0x689/0xd70 net/netlink/af_netlink.c:1866 sock_sendmsg_nosec net/socket.c:711 [inline] __sock_sendmsg net/socket.c:726 [inline] __sys_sendto+0x488/0x4f0 net/socket.c:2197 __do_sys_sendto net/socket.c:2204 [inline] __se_sys_sendto net/socket.c:2200 [inline] __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2200 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff8880276ec180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880276ec200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880276ec280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880276ec300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880276ec380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================