================================================================== BUG: KASAN: use-after-free in is_vlan_dev include/linux/if_vlan.h:74 [inline] BUG: KASAN: use-after-free in vlan_dev_real_dev+0xf9/0x120 net/8021q/vlan_core.c:105 Read of size 4 at addr ffff88806beaa22c by task kworker/u4:5/220 CPU: 1 PID: 220 Comm: kworker/u4:5 Not tainted 5.11.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: gid-cache-wq netdevice_event_work_handler Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:230 __kasan_report mm/kasan/report.c:396 [inline] kasan_report.cold+0x79/0xd5 mm/kasan/report.c:413 is_vlan_dev include/linux/if_vlan.h:74 [inline] vlan_dev_real_dev+0xf9/0x120 net/8021q/vlan_core.c:105 rdma_vlan_dev_real_dev include/rdma/ib_addr.h:267 [inline] is_eth_port_of_netdev_filter.part.0+0xca/0x2c0 drivers/infiniband/core/roce_gid_mgmt.c:157 is_eth_port_of_netdev_filter+0x28/0x40 drivers/infiniband/core/roce_gid_mgmt.c:153 ib_enum_roce_netdev+0x18f/0x2b0 drivers/infiniband/core/device.c:2287 ib_enum_all_roce_netdevs+0xbd/0x130 drivers/infiniband/core/device.c:2316 netdevice_event_work_handler+0x9c/0x1b0 drivers/infiniband/core/roce_gid_mgmt.c:626 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Allocated by task 21808: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:401 [inline] ____kasan_kmalloc.constprop.0+0x82/0xa0 mm/kasan/common.c:429 kmalloc_node include/linux/slab.h:575 [inline] kvmalloc_node+0x61/0xf0 mm/util.c:587 kvmalloc include/linux/mm.h:781 [inline] kvzalloc include/linux/mm.h:789 [inline] alloc_netdev_mqs+0x97/0xea0 net/core/dev.c:10534 rtnl_create_link+0x219/0xad0 net/core/rtnetlink.c:3171 __rtnl_newlink+0xf9b/0x16e0 net/core/rtnetlink.c:3433 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3491 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5553 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2345 ___sys_sendmsg+0xf3/0x170 net/socket.c:2399 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2432 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 21806: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:356 ____kasan_slab_free+0xe1/0x110 mm/kasan/common.c:362 kasan_slab_free include/linux/kasan.h:188 [inline] slab_free_hook mm/slub.c:1547 [inline] slab_free_freelist_hook+0x5d/0x150 mm/slub.c:1580 slab_free mm/slub.c:3142 [inline] kfree+0xdb/0x3b0 mm/slub.c:4124 kvfree+0x42/0x50 mm/util.c:616 device_release+0x9f/0x240 drivers/base/core.c:1962 kobject_cleanup lib/kobject.c:705 [inline] kobject_release lib/kobject.c:736 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1c8/0x540 lib/kobject.c:753 put_device+0x1b/0x30 drivers/base/core.c:3190 free_netdev+0x3f5/0x5e0 net/core/dev.c:10665 ppp_destroy_interface+0x2ab/0x340 drivers/net/ppp/ppp_generic.c:3364 ppp_release+0x1bf/0x240 drivers/net/ppp/ppp_generic.c:410 __fput+0x283/0x920 fs/file_table.c:280 task_work_run+0xdd/0x190 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff88806beaa000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 556 bytes inside of 4096-byte region [ffff88806beaa000, ffff88806beab000) The buggy address belongs to the page: page:00000000a57a25ee refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x6bea8 head:00000000a57a25ee order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888010042140 raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88806beaa100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88806beaa180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88806beaa200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88806beaa280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88806beaa300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================