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BUG: KASAN: slab-use-after-free in vhci_send_cmd_submit drivers/usb/usbip/vhci_tx.c:69 [inline]
BUG: KASAN: slab-use-after-free in vhci_tx_loop+0x3e9/0x1c50 drivers/usb/usbip/vhci_tx.c:241
Read of size 8 at addr ffff888026a80ea0 by task vhci_tx/7582

CPU: 0 UID: 0 PID: 7582 Comm: vhci_tx Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description+0x[  350.629874][ T7582]  print_address_description+0x55/0x1e0 mm/kasan/report.c:378
 print_report+0x58/0x70 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 vhci_send_cmd_submit drivers/usb/usbip/vhci_tx.c:69 [inline]
 vhci_tx_loop+0x3e9/0x1c50 drivers/usb/usbip/vhci_tx.c:241
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Allocated by task 5625:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __kmalloc_cache_noprof+0x3a6/0x690 mm/slub.c:5425
 _kmalloc_noprof include/linux/slab.h:967 [inline]
 _kzalloc_noprof include/linux/slab.h:1284 [inline]
 vhci_tx_urb drivers/usb/usbip/vhci_hcd.c:674 [inline]
 vhci_urb_enqueue+0x5c9/0xe10 drivers/usb/usbip/vhci_hcd.c:829
 usb_hcd_submit_urb+0x31a/0x1b10 drivers/usb/core/hcd.c:1542
 usb_start_wait_urb+0x13f/0x5b0 drivers/usb/core/message.c:62
 usb_internal_control_msg drivers/usb/core/message.c:117 [inline]
 usb_control_msg+0x234/0x3e0 drivers/usb/core/message.c:167
 get_bMaxPacketSize0 drivers/usb/core/hub.c:4851 [inline]
 hub_port_init+0xb1e/0x28c0 drivers/usb/core/hub.c:5047
 hub_port_connect drivers/usb/core/hub.c:5496 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
 port_event drivers/usb/core/hub.c:5871 [inline]
 hub_event+0x25d3/0x4f60 drivers/usb/core/hub.c:5953
 process_one_work+0x98b/0x1630 kernel/workqueue.c:3318
 process_scheduled_works kernel/workqueue.c:3401 [inline]
 worker_thread+0xb49/0x1140 kernel/workqueue.c:3482
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Freed by task 7581:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:253 [inline]
 __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
 kasan_slab_free include/linux/kasan.h:235 [inline]
 slab_free_hook mm/slub.c:2700 [inline]
 slab_free mm/slub.c:6284 [inline]
 kfree+0x1c5/0x6c0 mm/slub.c:6599
 pickup_urb_and_free_priv+0x225/0x3f0 drivers/usb/usbip/vhci_rx.c:46
 vhci_recv_ret_submit drivers/usb/usbip/vhci_rx.c:65 [inline]
 vhci_rx_pdu drivers/usb/usbip/vhci_rx.c:242 [inline]
 vhci_rx_loop+0x3c5/0xa00 drivers/usb/usbip/vhci_rx.c:265
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

The buggy address belongs to the object at ffff888026a80e80
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 32 bytes inside of
 freed 64-byte region [ffff888026a80e80, ffff888026a80ec0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x26a80
flags: 0x80000000000000(node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000000 ffff88813feab8c0 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800200020 00000000f5000000 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 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 6733761348, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1859
 prep_new_page mm/page_alloc.c:1867 [inline]
 get_page_from_freelist+0x265c/0x26e0 mm/page_alloc.c:3946
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5300
 alloc_slab_page mm/slub.c:3289 [inline]
 allocate_slab+0x74/0x5e0 mm/slub.c:3404
 new_slab mm/slub.c:3447 [inline]
 refill_objects+0x33c/0x3d0 mm/slub.c:7216
 refill_sheaf mm/slub.c:2827 [inline]
 __pcs_replace_empty_main+0x373/0x720 mm/slub.c:4665
 alloc_from_pcs mm/slub.c:4763 [inline]
 slab_alloc_node mm/slub.c:4897 [inline]
 __do_kmalloc_node mm/slub.c:5308 [inline]
 __kmalloc_noprof+0x530/0x7b0 mm/slub.c:5322
 _kmalloc_noprof include/linux/slab.h:971 [inline]
 _kzalloc_noprof include/linux/slab.h:1284 [inline]
 apply_wqattrs_prepare+0xf6/0xdc0 kernel/workqueue.c:5406
 apply_workqueue_attrs_locked kernel/workqueue.c:5491 [inline]
 alloc_and_link_pwqs kernel/workqueue.c:5648 [inline]
 __alloc_workqueue+0xf49/0x1f40 kernel/workqueue.c:5876
 alloc_workqueue_va kernel/workqueue.c:5925 [inline]
 alloc_workqueue_noprof+0xe3/0x210 kernel/workqueue.c:5941
 tty_register_driver+0x2f1/0xdd0 drivers/tty/tty_io.c:3451
 gsm_init+0x168/0x2e0 drivers/tty/n_gsm.c:4650
 do_one_initcall+0x250/0x870 init/main.c:1347
 do_initcall_level+0x104/0x190 init/main.c:1409
 do_initcalls+0x59/0xa0 init/main.c:1425
 kernel_init_freeable+0x2a6/0x3e0 init/main.c:1658
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888026a80d80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
 ffff888026a80e00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff888026a80e80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
                               ^
 ffff888026a80f00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff888026a80f80: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
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