================================================================== BUG: KASAN: use-after-free in __ethtool_get_link_ksettings+0x78/0x174 net/ethtool/ioctl.c:445 Read of size 8 at addr ffff0000f49c2208 by task kworker/0:15/8956 CPU: 0 PID: 8956 Comm: kworker/0:15 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025 Workqueue: infiniband ib_cache_event_task Call trace: dump_backtrace+0x1c0/0x1ec arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106 print_address_description+0x88/0x218 mm/kasan/report.c:316 print_report+0x50/0x68 mm/kasan/report.c:420 kasan_report+0xa8/0xfc mm/kasan/report.c:524 __asan_report_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:351 __ethtool_get_link_ksettings+0x78/0x174 net/ethtool/ioctl.c:445 ipvlan_ethtool_get_link_ksettings+0x48/0x58 drivers/net/ipvlan/ipvlan_main.c:410 __ethtool_get_link_ksettings+0x130/0x174 net/ethtool/ioctl.c:452 ib_get_eth_speed+0x154/0x474 drivers/infiniband/core/verbs.c:1898 rxe_query_port+0x6c/0x1b0 drivers/infiniband/sw/rxe/rxe_verbs.c:38 __ib_query_port drivers/infiniband/core/device.c:2081 [inline] ib_query_port+0x150/0x744 drivers/infiniband/core/device.c:2113 ib_cache_update+0x170/0x85c drivers/infiniband/core/cache.c:1483 ib_cache_event_task+0xbc/0x1a4 drivers/infiniband/core/cache.c:1557 process_one_work+0x7f8/0x13a4 kernel/workqueue.c:2292 worker_thread+0x8c4/0xfec kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850 Allocated by task 4325: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:53 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0xa0/0xb8 mm/kasan/common.c:384 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc_node+0xf0/0x17c mm/slab_common.c:943 kmalloc_node include/linux/slab.h:589 [inline] kvmalloc_node+0x88/0x1d4 mm/util.c:581 kvmalloc include/linux/slab.h:716 [inline] kvzalloc include/linux/slab.h:724 [inline] alloc_netdev_mqs+0x94/0xbd4 net/core/dev.c:10744 rtnl_create_link+0x2a8/0x98c net/core/rtnetlink.c:3295 rtnl_newlink_create net/core/rtnetlink.c:3412 [inline] __rtnl_newlink net/core/rtnetlink.c:3642 [inline] rtnl_newlink+0xf98/0x1a50 net/core/rtnetlink.c:3655 rtnetlink_rcv_msg+0x698/0xcdc net/core/rtnetlink.c:6150 netlink_rcv_skb+0x218/0x3e8 net/netlink/af_netlink.c:2511 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6168 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x60c/0x814 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x6f4/0x9c0 net/netlink/af_netlink.c:1872 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] __sys_sendto+0x324/0x440 net/socket.c:2152 __do_sys_sendto net/socket.c:2164 [inline] __se_sys_sendto net/socket.c:2160 [inline] __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2160 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 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 4814: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:53 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:516 ____kasan_slab_free+0x148/0x1b0 mm/kasan/common.c:237 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:245 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1729 [inline] slab_free_freelist_hook+0x16c/0x1e8 mm/slub.c:1755 slab_free mm/slub.c:3687 [inline] __kmem_cache_free+0xbc/0x218 mm/slub.c:3700 kfree+0xd0/0x1a8 mm/slab_common.c:988 kvfree+0x40/0x50 mm/util.c:627 netdev_freemem+0x4c/0x64 net/core/dev.c:10698 netdev_release+0x88/0xb0 net/core/net-sysfs.c:1908 device_release+0x8c/0x1ac drivers/base/core.c:-1 kobject_cleanup lib/kobject.c:681 [inline] kobject_release lib/kobject.c:712 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x2a8/0x420 lib/kobject.c:729 netdev_run_todo+0xc04/0xd2c net/core/dev.c:10534 rtnl_unlock+0x14/0x20 net/core/rtnetlink.c:147 default_device_exit_batch+0x9d8/0xa74 net/core/dev.c:11517 ops_exit_list net/core/net_namespace.c:177 [inline] cleanup_net+0x650/0xa84 net/core/net_namespace.c:640 process_one_work+0x7f8/0x13a4 kernel/workqueue.c:2292 worker_thread+0x8c4/0xfec kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850 The buggy address belongs to the object at ffff0000f49c2000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 520 bytes inside of 4096-byte region [ffff0000f49c2000, ffff0000f49c3000) The buggy address belongs to the physical page: page:000000009e1b6dd8 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1349c0 head:000000009e1b6dd8 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: ffff0000f49c2100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000f49c2180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000f49c2200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000f49c2280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000f49c2300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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