================================================================== BUG: KASAN: slab-use-after-free in __ethtool_get_link_ksettings+0xf4/0x100 net/ethtool/ioctl.c:441 Read of size 8 at addr ffff00001c94a2f8 by task kworker/1:0/12712 CPU: 1 PID: 12712 Comm: kworker/1:0 Not tainted 6.9.0-rc5-syzkaller-00025-ga2c63a3f3d68 #0 Hardware name: linux,dummy-virt (DT) Workqueue: events smc_ib_port_event_work Call trace: dump_backtrace+0x9c/0x11c arch/arm64/kernel/stacktrace.c:317 show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:324 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xa4/0xf4 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0xf4/0x5a4 mm/kasan/report.c:488 kasan_report+0xc8/0x108 mm/kasan/report.c:601 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 __ethtool_get_link_ksettings+0xf4/0x100 net/ethtool/ioctl.c:441 ipvlan_ethtool_get_link_ksettings+0x34/0x54 drivers/net/ipvlan/ipvlan_main.c:409 __ethtool_get_link_ksettings+0x9c/0x100 net/ethtool/ioctl.c:445 ib_get_eth_speed+0xe8/0x90c drivers/infiniband/core/verbs.c:1984 rxe_query_port+0x68/0x1cc drivers/infiniband/sw/rxe/rxe_verbs.c:55 __ib_query_port drivers/infiniband/core/device.c:2067 [inline] ib_query_port drivers/infiniband/core/device.c:2099 [inline] ib_query_port+0x304/0x600 drivers/infiniband/core/device.c:2089 smc_ib_remember_port_attr net/smc/smc_ib.c:359 [inline] smc_ib_port_event_work+0x104/0x880 net/smc/smc_ib.c:383 process_one_work+0x78c/0x1898 kernel/workqueue.c:3254 process_scheduled_works kernel/workqueue.c:3335 [inline] worker_thread+0x764/0xc24 kernel/workqueue.c:3416 kthread+0x27c/0x300 kernel/kthread.c:388 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Allocated by task 18787: kasan_save_stack+0x3c/0x64 mm/kasan/common.c:47 kasan_save_track+0x20/0x3c mm/kasan/common.c:68 kasan_save_alloc_info+0x40/0x54 mm/kasan/generic.c:565 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0xb8/0xbc mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:3966 [inline] __kmalloc_node+0x1e0/0x420 mm/slub.c:3973 kmalloc_node include/linux/slab.h:648 [inline] kvmalloc_node+0x1c/0x1b4 mm/util.c:634 kvmalloc include/linux/slab.h:766 [inline] kvzalloc include/linux/slab.h:774 [inline] alloc_netdev_mqs+0x60/0xe00 net/core/dev.c:10849 rtnl_create_link+0x900/0xbc8 net/core/rtnetlink.c:3358 rtnl_newlink_create net/core/rtnetlink.c:3484 [inline] __rtnl_newlink+0xac0/0x11dc net/core/rtnetlink.c:3714 rtnl_newlink+0x6c/0xa4 net/core/rtnetlink.c:3727 rtnetlink_rcv_msg+0x2e8/0x8bc net/core/rtnetlink.c:6595 netlink_rcv_skb+0x190/0x334 net/netlink/af_netlink.c:2559 rtnetlink_rcv+0x18/0x24 net/core/rtnetlink.c:6613 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline] netlink_unicast+0x3bc/0x660 net/netlink/af_netlink.c:1361 netlink_sendmsg+0x654/0xa44 net/netlink/af_netlink.c:1905 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0xc8/0x168 net/socket.c:745 __sys_sendto+0x1a8/0x254 net/socket.c:2191 __do_sys_sendto net/socket.c:2203 [inline] __se_sys_sendto net/socket.c:2199 [inline] __arm64_sys_sendto+0xc0/0x134 net/socket.c:2199 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x6c/0x25c arch/arm64/kernel/syscall.c:48 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:133 do_el0_svc+0x40/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x50/0x180 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 Freed by task 13009: kasan_save_stack+0x3c/0x64 mm/kasan/common.c:47 kasan_save_track+0x20/0x3c mm/kasan/common.c:68 kasan_save_free_info+0x4c/0x74 mm/kasan/generic.c:579 poison_slab_object+0x11c/0x16c mm/kasan/common.c:240 __kasan_slab_free+0x1c/0x44 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2106 [inline] slab_free mm/slub.c:4280 [inline] kfree+0x118/0x350 mm/slub.c:4390 kvfree+0x3c/0x4c mm/util.c:680 netdev_freemem+0x48/0x60 net/core/dev.c:10803 netdev_release+0x70/0x98 net/core/net-sysfs.c:2031 device_release+0xe4/0x1e8 drivers/base/core.c:2580 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x17c/0x444 lib/kobject.c:737 netdev_run_todo+0x558/0xcb0 net/core/dev.c:10600 rtnl_unlock+0x10/0x1c net/core/rtnetlink.c:152 default_device_exit_batch+0x54c/0x764 net/core/dev.c:11641 ops_exit_list+0xf0/0x140 net/core/net_namespace.c:175 cleanup_net+0x430/0x8d0 net/core/net_namespace.c:637 process_one_work+0x78c/0x1898 kernel/workqueue.c:3254 process_scheduled_works kernel/workqueue.c:3335 [inline] worker_thread+0x764/0xc24 kernel/workqueue.c:3416 kthread+0x27c/0x300 kernel/kthread.c:388 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 The buggy address belongs to the object at ffff00001c94a000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 760 bytes inside of freed 4096-byte region [ffff00001c94a000, ffff00001c94b000) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5c948 head: order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff000017b03241 flags: 0x1ffe00000000840(slab|head|node=0|zone=0|lastcpupid=0xfff) page_type: 0xffffffff() raw: 01ffe00000000840 ffff000009c0f500 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000040004 00000001ffffffff ffff000017b03241 head: 01ffe00000000840 ffff000009c0f500 dead000000000100 dead000000000122 head: 0000000000000000 0000000000040004 00000001ffffffff ffff000017b03241 head: 01ffe00000000003 fffffdffc0725201 dead000000000122 00000000ffffffff head: 0000000800000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff00001c94a180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff00001c94a200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff00001c94a280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff00001c94a300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff00001c94a380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================