================================================================== BUG: KASAN: slab-use-after-free in __ethtool_get_link_ksettings+0xf4/0x100 net/ethtool/ioctl.c:441 Read of size 8 at addr ffff00000ecd82f0 by task kworker/0:1/22121 CPU: 0 PID: 22121 Comm: kworker/0:1 Not tainted 6.7.0-syzkaller-09928-g052d534373b7 #0 Hardware name: linux,dummy-virt (DT) Workqueue: infiniband ib_cache_event_task Call trace: dump_backtrace+0x9c/0x11c arch/arm64/kernel/stacktrace.c:291 show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:298 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x74/0xd4 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0xd8/0x598 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:2060 [inline] ib_query_port drivers/infiniband/core/device.c:2092 [inline] ib_query_port+0x304/0x600 drivers/infiniband/core/device.c:2082 ib_cache_update.part.0+0xd4/0x7d0 drivers/infiniband/core/cache.c:1498 ib_cache_update drivers/infiniband/core/cache.c:1572 [inline] ib_cache_event_task+0x138/0x1f4 drivers/infiniband/core/cache.c:1572 process_one_work+0x670/0x143c kernel/workqueue.c:2633 process_scheduled_works kernel/workqueue.c:2706 [inline] worker_thread+0x5a8/0xfb0 kernel/workqueue.c:2787 kthread+0x27c/0x300 kernel/kthread.c:388 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:857 Allocated by task 3150: kasan_save_stack+0x3c/0x64 mm/kasan/common.c:47 kasan_save_track+0x20/0x3c mm/kasan/common.c:68 kasan_save_alloc_info+0x58/0x68 mm/kasan/generic.c:620 poison_kmalloc_redzone mm/kasan/common.c:372 [inline] __kasan_kmalloc+0xb8/0xbc mm/kasan/common.c:389 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slub.c:3981 [inline] __kmalloc_node+0x1e0/0x420 mm/slub.c:3988 kmalloc_node include/linux/slab.h:610 [inline] kvmalloc_node+0x1c/0x144 mm/util.c:617 kvmalloc include/linux/slab.h:728 [inline] kvzalloc include/linux/slab.h:736 [inline] alloc_netdev_mqs+0x6c/0xe08 net/core/dev.c:10826 rtnl_create_link+0x900/0xbc8 net/core/rtnetlink.c:3379 rtnl_newlink_create net/core/rtnetlink.c:3505 [inline] __rtnl_newlink+0xac4/0x11e0 net/core/rtnetlink.c:3735 rtnl_newlink+0x6c/0xa4 net/core/rtnetlink.c:3748 rtnetlink_rcv_msg+0x2e8/0x870 net/core/rtnetlink.c:6615 netlink_rcv_skb+0x18c/0x330 net/netlink/af_netlink.c:2543 rtnetlink_rcv+0x18/0x24 net/core/rtnetlink.c:6633 netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline] netlink_unicast+0x3bc/0x660 net/netlink/af_netlink.c:1367 netlink_sendmsg+0x654/0xa40 net/netlink/af_netlink.c:1908 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:37 [inline] invoke_syscall+0x6c/0x258 arch/arm64/kernel/syscall.c:51 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:136 do_el0_svc_compat+0x40/0x68 arch/arm64/kernel/syscall.c:161 el0_svc_compat+0x54/0x13c arch/arm64/kernel/entry-common.c:818 el0t_32_sync_handler+0x98/0x13c arch/arm64/kernel/entry-common.c:828 el0t_32_sync+0x194/0x198 arch/arm64/kernel/entry.S:600 Freed by task 21039: kasan_save_stack+0x3c/0x64 mm/kasan/common.c:47 kasan_save_track+0x20/0x3c mm/kasan/common.c:68 kasan_save_free_info+0x50/0x84 mm/kasan/generic.c:634 poison_slab_object+0x118/0x168 mm/kasan/common.c:241 __kasan_slab_free+0x20/0x7c mm/kasan/common.c:257 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+0x114/0x328 mm/slub.c:4409 kvfree+0x3c/0x4c mm/util.c:663 netdev_freemem+0x48/0x60 net/core/dev.c:10780 netdev_release+0x70/0x98 net/core/net-sysfs.c:1950 device_release+0xe4/0x1e8 drivers/base/core.c:2485 kobject_cleanup lib/kobject.c:682 [inline] kobject_release lib/kobject.c:716 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x160/0x3ac lib/kobject.c:733 netdev_run_todo+0x59c/0xd68 net/core/dev.c:10581 rtnl_unlock+0x10/0x1c net/core/rtnetlink.c:152 default_device_exit_batch+0x344/0x474 net/core/dev.c:11611 ops_exit_list+0xf0/0x140 net/core/net_namespace.c:175 cleanup_net+0x3b0/0x838 net/core/net_namespace.c:618 process_one_work+0x670/0x143c kernel/workqueue.c:2633 process_scheduled_works kernel/workqueue.c:2706 [inline] worker_thread+0x5a8/0xfb0 kernel/workqueue.c:2787 kthread+0x27c/0x300 kernel/kthread.c:388 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:857 The buggy address belongs to the object at ffff00000ecd8000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 752 bytes inside of freed 4096-byte region [ffff00000ecd8000, ffff00000ecd9000) The buggy address belongs to the physical page: page:00000000017fb15c refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4ecd8 head:00000000017fb15c order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x1ffc00000000840(slab|head|node=0|zone=0|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 01ffc00000000840 ffff000009c0f500 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff00000ecd8180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff00000ecd8200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff00000ecd8280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff00000ecd8300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff00000ecd8380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================