================================================================== BUG: KASAN: use-after-free in vhci_send_cmd_submit drivers/usb/usbip/vhci_tx.c:69 [inline] BUG: KASAN: use-after-free in vhci_tx_loop+0x354/0x1730 drivers/usb/usbip/vhci_tx.c:241 Read of size 8 at addr ffff0000d911e620 by task vhci_tx/5683 CPU: 0 PID: 5683 Comm: vhci_tx Not tainted 5.15.179-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call trace: dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 print_address_description+0x7c/0x3f0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0x174/0x1e4 mm/kasan/report.c:451 __asan_report_load8_noabort+0x44/0x50 mm/kasan/report_generic.c:309 vhci_send_cmd_submit drivers/usb/usbip/vhci_tx.c:69 [inline] vhci_tx_loop+0x354/0x1730 drivers/usb/usbip/vhci_tx.c:241 kthread+0x37c/0x45c kernel/kthread.c:334 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 Allocated by task 25: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc+0xbc/0xfc mm/kasan/common.c:513 __kasan_kmalloc+0x10/0x1c mm/kasan/common.c:522 kasan_kmalloc include/linux/kasan.h:264 [inline] kmem_cache_alloc_trace+0x27c/0x47c mm/slub.c:3247 kmalloc include/linux/slab.h:591 [inline] kzalloc include/linux/slab.h:721 [inline] vhci_tx_urb drivers/usb/usbip/vhci_hcd.c:670 [inline] vhci_urb_enqueue+0x51c/0xcb8 drivers/usb/usbip/vhci_hcd.c:803 usb_hcd_submit_urb+0x334/0x1b18 drivers/usb/core/hcd.c:1559 usb_submit_urb+0xe94/0x1588 drivers/usb/core/urb.c:594 usb_start_wait_urb+0xec/0x414 drivers/usb/core/message.c:58 usb_internal_control_msg drivers/usb/core/message.c:102 [inline] usb_control_msg+0x228/0x3f8 drivers/usb/core/message.c:153 get_bMaxPacketSize0 drivers/usb/core/hub.c:4750 [inline] hub_port_init+0x96c/0x21cc drivers/usb/core/hub.c:4947 hub_port_connect drivers/usb/core/hub.c:5396 [inline] hub_port_connect_change drivers/usb/core/hub.c:5607 [inline] port_event drivers/usb/core/hub.c:5753 [inline] hub_event+0x203c/0x46b8 drivers/usb/core/hub.c:5835 process_one_work+0x790/0x11b8 kernel/workqueue.c:2310 worker_thread+0x910/0x1034 kernel/workqueue.c:2457 kthread+0x37c/0x45c kernel/kthread.c:334 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 Freed by task 5682: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x84 mm/kasan/common.c:46 kasan_set_free_info+0x28/0x4c mm/kasan/generic.c:360 ____kasan_slab_free+0x118/0x164 mm/kasan/common.c:366 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1705 [inline] slab_free_freelist_hook+0x128/0x1ec mm/slub.c:1731 slab_free mm/slub.c:3499 [inline] kfree+0x178/0x410 mm/slub.c:4559 pickup_urb_and_free_priv+0x228/0x370 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+0x334/0xd94 drivers/usb/usbip/vhci_rx.c:265 kthread+0x37c/0x45c kernel/kthread.c:334 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 The buggy address belongs to the object at ffff0000d911e600 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 32 bytes inside of 128-byte region [ffff0000d911e600, ffff0000d911e680) The buggy address belongs to the page: page:00000000f180b1db refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11911e flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000200 0000000000000000 dead000000000122 ffff0000c0002300 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d911e500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d911e580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000d911e600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000d911e680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000d911e700: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== Unable to handle kernel paging request at virtual address fb87806900000006 Mem abort info: ESR = 0x0000000096000004 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x04: level 0 translation fault Data abort info: ISV = 0, ISS = 0x00000004 CM = 0, WnR = 0 [fb87806900000006] address between user and kernel address ranges Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 5683 Comm: vhci_tx Tainted: G B 5.15.179-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 pstate: 00400005 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : setup_cmd_submit_pdu drivers/usb/usbip/vhci_tx.c:16 [inline] pc : vhci_send_cmd_submit drivers/usb/usbip/vhci_tx.c:95 [inline] pc : vhci_tx_loop+0x4a8/0x1730 drivers/usb/usbip/vhci_tx.c:241 lr : setup_cmd_submit_pdu drivers/usb/usbip/vhci_tx.c:15 [inline] lr : vhci_send_cmd_submit drivers/usb/usbip/vhci_tx.c:95 [inline] lr : vhci_tx_loop+0x49c/0x1730 drivers/usb/usbip/vhci_tx.c:241 sp : ffff8000206c7a00 x29: ffff8000206c7df0 x28: ffff0000e6489d00 x27: ffff0000cf26c590 x26: ffff8000206c7cf0 x25: ffff0000d166fa7c x24: ffff8000206c7c70 x23: dc40034800000031 x22: dfff800000000000 x21: dc40034800000019 x20: ffff0000d166fa00 x19: 0000000000000003 x18: 1fffe0003682e78e x17: 1fffe0003682e78e x16: ffff80000824f3a0 x15: ffff800014c0f2a0 x14: 00000000ffff8000 x13: ffff80000802b56c x12: 0000000000000001 x11: 0000000000000000 x10: 0000000000000000 x9 : ffff80001b849390 x8 : 1b88006900000006 x7 : 0000000000000000 x6 : ffff8000088d550c x5 : ffff0000f221dc88 x4 : 0000000000000000 x3 : ffff80000df35ae4 x2 : 0000000000000000 x1 : 0000000000000008 x0 : 0000000000000000 Call trace: setup_cmd_submit_pdu drivers/usb/usbip/vhci_tx.c:16 [inline] vhci_send_cmd_submit drivers/usb/usbip/vhci_tx.c:95 [inline] vhci_tx_loop+0x4a8/0x1730 drivers/usb/usbip/vhci_tx.c:241 kthread+0x37c/0x45c kernel/kthread.c:334 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 Code: 96a6889a f94002b5 910062b7 d343fee8 (38766908) ---[ end trace b4f54a6be561741b ]--- ---------------- Code disassembly (best guess): 0: 96a6889a bl 0xfffffffffa9a2268 4: f94002b5 ldr x21, [x21] 8: 910062b7 add x23, x21, #0x18 c: d343fee8 lsr x8, x23, #3 * 10: 38766908 ldrb w8, [x8, x22] <-- trapping instruction