================================================================== BUG: KASAN: use-after-free in virtqueue_add+0x3603/0x3dd0 drivers/virtio/virtio_ring.c:1704 Read of size 1 at addr ffff8881ded25b38 by task kworker/0:1H/95 CPU: 0 PID: 95 Comm: kworker/0:1H Not tainted 5.4.125-syzkaller-00121-g83ffd1a84016 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: kblockd blk_mq_run_work_fn Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d8/0x24e lib/dump_stack.c:118 print_address_description+0x9b/0x650 mm/kasan/report.c:384 __kasan_report+0x182/0x260 mm/kasan/report.c:516 kasan_report+0x30/0x60 mm/kasan/common.c:641 virtqueue_add+0x3603/0x3dd0 drivers/virtio/virtio_ring.c:1704 virtqueue_add_sgs+0x112/0x130 drivers/virtio/virtio_ring.c:1740 __virtscsi_add_cmd drivers/scsi/virtio_scsi.c:447 [inline] virtscsi_add_cmd+0x52b/0x680 drivers/scsi/virtio_scsi.c:481 virtscsi_queuecommand+0x34d/0x590 drivers/scsi/virtio_scsi.c:578 scsi_dispatch_cmd+0x2f0/0x6e0 drivers/scsi/scsi_lib.c:1566 scsi_queue_rq+0x1c53/0x2720 drivers/scsi/scsi_lib.c:1701 blk_mq_dispatch_rq_list+0x90c/0x17e0 block/blk-mq.c:1297 blk_mq_do_dispatch_sched+0x313/0x3f0 block/blk-mq-sched.c:124 blk_mq_sched_dispatch_requests+0x4e3/0x5e0 block/blk-mq-sched.c:220 __blk_mq_run_hw_queue+0x142/0x260 block/blk-mq.c:1428 process_one_work+0x679/0x1030 kernel/workqueue.c:2277 worker_thread+0xa6f/0x1400 kernel/workqueue.c:2423 kthread+0x30f/0x330 kernel/kthread.c:268 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 Allocated by task 518: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x137/0x1e0 mm/kasan/common.c:517 kmem_cache_alloc_trace+0x139/0x2b0 mm/slub.c:2848 kmalloc include/linux/slab.h:556 [inline] __vring_new_virtqueue+0x141/0xd40 drivers/virtio/virtio_ring.c:2071 vring_create_virtqueue_split drivers/virtio/virtio_ring.c:894 [inline] vring_create_virtqueue+0x1830/0x1d00 drivers/virtio/virtio_ring.c:2152 setup_vq+0x161/0x370 drivers/virtio/virtio_pci_legacy.c:137 vp_setup_vq+0xbc/0x330 drivers/virtio/virtio_pci_common.c:189 vp_find_vqs_msix+0x88b/0xc40 drivers/virtio/virtio_pci_common.c:323 vp_find_vqs+0x45/0x4a0 drivers/virtio/virtio_pci_common.c:400 virtio_find_vqs include/linux/virtio_config.h:197 [inline] virtscsi_init+0x490/0xa60 drivers/scsi/virtio_scsi.c:807 virtscsi_restore+0xe2/0xe90 drivers/scsi/virtio_scsi.c:941 virtio_device_restore+0x39c/0x5a0 drivers/virtio/virtio.c:413 dpm_run_callback drivers/base/power/main.c:487 [inline] device_resume+0x543/0x910 drivers/base/power/main.c:1029 async_resume+0x23/0x170 drivers/base/power/main.c:1049 async_run_entry_fn+0xea/0x3c0 kernel/async.c:123 process_one_work+0x679/0x1030 kernel/workqueue.c:2277 worker_thread+0xa6f/0x1400 kernel/workqueue.c:2423 kthread+0x30f/0x330 kernel/kthread.c:268 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 Freed by task 519: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] kasan_set_free_info mm/kasan/common.c:333 [inline] __kasan_slab_free+0x18a/0x240 mm/kasan/common.c:475 slab_free_hook mm/slub.c:1454 [inline] slab_free_freelist_hook+0x7b/0x150 mm/slub.c:1492 slab_free mm/slub.c:3072 [inline] kfree+0xe0/0x660 mm/slub.c:4061 vp_del_vq drivers/virtio/virtio_pci_common.c:221 [inline] vp_del_vqs+0x37c/0x8c0 drivers/virtio/virtio_pci_common.c:243 virtscsi_remove_vqs drivers/scsi/virtio_scsi.c:772 [inline] virtscsi_freeze+0x8d/0xa0 drivers/scsi/virtio_scsi.c:931 virtio_pci_freeze+0x39/0x70 drivers/virtio/virtio_pci_common.c:466 pci_pm_suspend+0x2dc/0x910 drivers/pci/pci-driver.c:789 dpm_run_callback drivers/base/power/main.c:487 [inline] __device_suspend+0x84c/0x1300 drivers/base/power/main.c:1816 async_suspend+0x25/0x1f0 drivers/base/power/main.c:1848 async_run_entry_fn+0xea/0x3c0 kernel/async.c:123 process_one_work+0x679/0x1030 kernel/workqueue.c:2277 worker_thread+0xa6f/0x1400 kernel/workqueue.c:2423 kthread+0x30f/0x330 kernel/kthread.c:268 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff8881ded25b00 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 56 bytes inside of 192-byte region [ffff8881ded25b00, ffff8881ded25bc0) The buggy address belongs to the page: page:ffffea00077b4940 refcount:1 mapcount:0 mapping:ffff8881f5c02a00 index:0x0 flags: 0x8000000000000200(slab) raw: 8000000000000200 ffffea00068a5f00 0000000a00000003 ffff8881f5c02a00 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY) set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook mm/page_alloc.c:2165 [inline] prep_new_page+0x19a/0x380 mm/page_alloc.c:2171 get_page_from_freelist+0x550/0x8b0 mm/page_alloc.c:3794 __alloc_pages_nodemask+0x3a2/0x880 mm/page_alloc.c:4855 alloc_slab_page+0x39/0x3e0 mm/slub.c:342 allocate_slab mm/slub.c:1675 [inline] new_slab+0x97/0x460 mm/slub.c:1741 new_slab_objects mm/slub.c:2498 [inline] ___slab_alloc+0x330/0x4c0 mm/slub.c:2659 __slab_alloc mm/slub.c:2699 [inline] slab_alloc_node mm/slub.c:2784 [inline] slab_alloc mm/slub.c:2829 [inline] kmem_cache_alloc_trace+0x199/0x2b0 mm/slub.c:2846 kmalloc include/linux/slab.h:556 [inline] kzalloc include/linux/slab.h:690 [inline] mld_add_delrec net/ipv6/mcast.c:737 [inline] igmp6_leave_group net/ipv6/mcast.c:2456 [inline] igmp6_group_dropped+0x4c4/0xba0 net/ipv6/mcast.c:716 __ipv6_dev_mc_dec+0x26f/0x4e0 net/ipv6/mcast.c:958 addrconf_leave_solict net/ipv6/addrconf.c:2165 [inline] __ipv6_ifa_notify+0x91e/0x1340 net/ipv6/addrconf.c:6054 addrconf_ifdown+0xb57/0x15e0 net/ipv6/addrconf.c:3855 addrconf_notify+0x45f/0x3c90 net/ipv6/addrconf.c:3666 notifier_call_chain kernel/notifier.c:98 [inline] __raw_notifier_call_chain kernel/notifier.c:399 [inline] raw_notifier_call_chain+0x9e/0x110 kernel/notifier.c:406 __dev_notify_flags+0x264/0x4f0 net/core/dev.c:1670 dev_change_flags+0xe3/0x190 net/core/dev.c:7983 do_setlink+0xc2c/0x3b50 net/core/rtnetlink.c:2519 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1176 [inline] free_pcp_prepare+0x1a9/0x270 mm/page_alloc.c:1233 free_unref_page_prepare mm/page_alloc.c:3085 [inline] free_unref_page mm/page_alloc.c:3134 [inline] free_the_page mm/page_alloc.c:4915 [inline] __free_pages+0x9c/0x250 mm/page_alloc.c:4923 __free_slab+0x237/0x2f0 mm/slub.c:1766 free_slab mm/slub.c:1781 [inline] discard_slab mm/slub.c:1787 [inline] unfreeze_partials+0x14f/0x180 mm/slub.c:2279 put_cpu_partial+0xb5/0x150 mm/slub.c:2315 __slab_free mm/slub.c:2963 [inline] do_slab_free mm/slub.c:3060 [inline] ___cache_free+0x352/0x4e0 mm/slub.c:3079 qlist_free_all mm/kasan/quarantine.c:167 [inline] quarantine_reduce+0x17a/0x1e0 mm/kasan/quarantine.c:260 __kasan_kmalloc+0x43/0x1e0 mm/kasan/common.c:495 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2821 [inline] slab_alloc mm/slub.c:2829 [inline] kmem_cache_alloc+0x115/0x290 mm/slub.c:2834 getname_flags+0xba/0x640 fs/namei.c:141 getname fs/namei.c:212 [inline] user_path_create fs/namei.c:3771 [inline] do_mkdirat+0x9e/0x330 fs/namei.c:3909 do_syscall_64+0xcb/0x1e0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Memory state around the buggy address: ffff8881ded25a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881ded25a80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff8881ded25b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881ded25b80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8881ded25c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================