================================================================== BUG: KASAN: use-after-free in __ethtool_get_link_ksettings+0x78/0x13c net/ethtool/ioctl.c:445 Read of size 8 at addr ffff0000dc19c208 by task kworker/0:3/4239 CPU: 0 PID: 4239 Comm: kworker/0:3 Not tainted 6.1.92-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Workqueue: infiniband ib_cache_event_task Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x174/0x4c0 mm/kasan/report.c:395 kasan_report+0xd4/0x130 mm/kasan/report.c:495 __asan_report_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:351 __ethtool_get_link_ksettings+0x78/0x13c net/ethtool/ioctl.c:445 ipvlan_ethtool_get_link_ksettings+0x48/0x58 drivers/net/ipvlan/ipvlan_main.c:408 __ethtool_get_link_ksettings+0xec/0x13c net/ethtool/ioctl.c:449 ib_get_eth_speed+0x14c/0x480 drivers/infiniband/core/verbs.c:1898 siw_query_port+0x58/0x3d8 drivers/infiniband/sw/siw/siw_verbs.c:173 iw_query_port drivers/infiniband/core/device.c:2056 [inline] ib_query_port+0x5b0/0x74c drivers/infiniband/core/device.c:2097 ib_cache_update+0x17c/0x914 drivers/infiniband/core/cache.c:1487 ib_cache_event_task+0xd8/0x1c4 drivers/infiniband/core/cache.c:1561 process_one_work+0x7ac/0x1404 kernel/workqueue.c:2292 worker_thread+0x8e4/0xfec kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864 Allocated by task 4254: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:955 [inline] __kmalloc_node+0xe0/0x1d0 mm/slab_common.c:962 kmalloc_node include/linux/slab.h:582 [inline] kvmalloc_node+0x84/0x1e4 mm/util.c:581 kvmalloc include/linux/slab.h:709 [inline] kvzalloc include/linux/slab.h:717 [inline] alloc_netdev_mqs+0x94/0xba8 net/core/dev.c:10622 rtnl_create_link+0x2cc/0x928 net/core/rtnetlink.c:3263 rtnl_newlink_create net/core/rtnetlink.c:3380 [inline] __rtnl_newlink net/core/rtnetlink.c:3610 [inline] rtnl_newlink+0x10b8/0x1b74 net/core/rtnetlink.c:3623 rtnetlink_rcv_msg+0x72c/0xd94 net/core/rtnetlink.c:6121 netlink_rcv_skb+0x20c/0x3b8 net/netlink/af_netlink.c:2508 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6139 netlink_unicast_kernel net/netlink/af_netlink.c:1326 [inline] netlink_unicast+0x65c/0x898 net/netlink/af_netlink.c:1352 netlink_sendmsg+0x834/0xb18 net/netlink/af_netlink.c:1874 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] __sys_sendto+0x3b8/0x508 net/socket.c:2148 __do_sys_sendto net/socket.c:2160 [inline] __se_sys_sendto net/socket.c:2156 [inline] __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2156 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Freed by task 5162: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:516 ____kasan_slab_free+0x144/0x1c0 mm/kasan/common.c:236 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:244 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook mm/slub.c:1750 [inline] slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0x2c0/0x4b4 mm/slub.c:3674 kfree+0xcc/0x1b8 mm/slab_common.c:1007 kvfree+0x40/0x50 mm/util.c:627 netdev_freemem+0x4c/0x64 net/core/dev.c:10576 netdev_release+0x88/0xb0 net/core/net-sysfs.c:1908 device_release+0x8c/0x1ac kobject_cleanup lib/kobject.c:681 [inline] kobject_release lib/kobject.c:712 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x2a8/0x41c lib/kobject.c:729 netdev_run_todo+0xcf0/0xe08 net/core/dev.c:10412 rtnl_unlock+0x14/0x20 net/core/rtnetlink.c:147 default_device_exit_batch+0x9f8/0xa70 net/core/dev.c:11395 ops_exit_list net/core/net_namespace.c:177 [inline] cleanup_net+0x5dc/0x994 net/core/net_namespace.c:604 process_one_work+0x7ac/0x1404 kernel/workqueue.c:2292 worker_thread+0x8e4/0xfec kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864 The buggy address belongs to the object at ffff0000dc19c000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 520 bytes inside of 4096-byte region [ffff0000dc19c000, ffff0000dc19d000) The buggy address belongs to the physical page: page:00000000344aab88 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11c198 head:00000000344aab88 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 0000000000000000 dead000000000122 ffff0000c0003500 raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000dc19c100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000dc19c180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000dc19c200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000dc19c280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000dc19c300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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