configfs-gadget.g1 gadget.0: uvc: uvc_function_bind() configfs-gadget.g1 gadget.0: uvc: Unable to allocate streaming EP ================================================================== BUG: KASAN: slab-out-of-bounds in list_empty include/linux/list.h:292 [inline] BUG: KASAN: slab-out-of-bounds in dummy_free_request+0x44/0x84 drivers/usb/gadget/udc/dummy_hcd.c:690 Read of size 8 at addr ffff0000d052caf0 by task syz.1.1175/7186 CPU: 1 PID: 7186 Comm: syz.1.1175 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026 Call trace: dump_backtrace+0x1c4/0x1f0 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 list_empty include/linux/list.h:292 [inline] dummy_free_request+0x44/0x84 drivers/usb/gadget/udc/dummy_hcd.c:690 usb_ep_free_request+0x138/0x34c drivers/usb/gadget/udc/core.c:221 uvc_function_bind+0x8b0/0xfe8 drivers/usb/gadget/function/f_uvc.c:789 usb_add_function+0x234/0x7a8 drivers/usb/gadget/composite.c:337 configfs_composite_bind+0x7e0/0xce4 drivers/usb/gadget/configfs.c:1409 gadget_bind_driver+0x26c/0x684 drivers/usb/gadget/udc/core.c:1651 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x3a0/0xac4 drivers/base/dd.c:638 __driver_probe_device+0x1c8/0x368 drivers/base/dd.c:804 driver_probe_device+0x78/0x324 drivers/base/dd.c:834 __driver_attach+0x3bc/0x614 drivers/base/dd.c:1220 bus_for_each_dev+0x148/0x1d0 drivers/base/bus.c:303 driver_attach+0x50/0x60 drivers/base/dd.c:1237 bus_add_driver+0x2c0/0x518 drivers/base/bus.c:620 driver_register+0x200/0x37c drivers/base/driver.c:246 usb_gadget_register_driver_owner+0xf0/0x25c drivers/usb/gadget/udc/core.c:1730 gadget_dev_desc_UDC_store+0x168/0x268 drivers/usb/gadget/configfs.c:290 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x260/0x338 fs/configfs/file.c:229 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x3c8/0x7c8 fs/read_write.c:584 ksys_write+0x12c/0x228 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:646 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 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 Allocated by task 1: 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] kmalloc_trace+0x7c/0x94 mm/slab_common.c:1031 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] dev_pm_qos_expose_flags+0xa0/0x28c drivers/base/power/qos.c:782 usb_hub_create_port_device+0x584/0x9f8 drivers/usb/core/port.c:754 hub_configure drivers/usb/core/hub.c:1708 [inline] hub_probe+0x1d70/0x2cc4 drivers/usb/core/hub.c:1975 usb_probe_interface+0x50c/0x988 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x3a0/0xac4 drivers/base/dd.c:638 __driver_probe_device+0x1c8/0x368 drivers/base/dd.c:804 driver_probe_device+0x78/0x324 drivers/base/dd.c:834 __device_attach_driver+0x28c/0x4c0 drivers/base/dd.c:962 bus_for_each_drv+0x154/0x1e4 drivers/base/bus.c:429 __device_attach+0x2a4/0x3d8 drivers/base/dd.c:1034 device_initial_probe+0x24/0x34 drivers/base/dd.c:1083 bus_probe_device+0xbc/0x1c4 drivers/base/bus.c:489 device_add+0x93c/0xe4c drivers/base/core.c:3712 usb_set_configuration+0x15ec/0x1b88 drivers/usb/core/message.c:2223 usb_generic_driver_probe+0x8c/0x148 drivers/usb/core/generic.c:238 usb_probe_device+0x120/0x258 drivers/usb/core/driver.c:293 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x3a0/0xac4 drivers/base/dd.c:638 __driver_probe_device+0x1c8/0x368 drivers/base/dd.c:804 driver_probe_device+0x78/0x324 drivers/base/dd.c:834 __device_attach_driver+0x28c/0x4c0 drivers/base/dd.c:962 bus_for_each_drv+0x154/0x1e4 drivers/base/bus.c:429 __device_attach+0x2a4/0x3d8 drivers/base/dd.c:1034 device_initial_probe+0x24/0x34 drivers/base/dd.c:1083 bus_probe_device+0xbc/0x1c4 drivers/base/bus.c:489 device_add+0x93c/0xe4c drivers/base/core.c:3712 usb_new_device+0x7e4/0x11d0 drivers/usb/core/hub.c:2659 register_root_hub+0x220/0x514 drivers/usb/core/hcd.c:1019 usb_add_hcd+0x910/0xd68 drivers/usb/core/hcd.c:2999 vhci_hcd_probe+0x13c/0x354 drivers/usb/usbip/vhci_hcd.c:1387 platform_probe+0x148/0x1c8 drivers/base/platform.c:1400 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x3a0/0xac4 drivers/base/dd.c:638 __driver_probe_device+0x1c8/0x368 drivers/base/dd.c:804 driver_probe_device+0x78/0x324 drivers/base/dd.c:834 __device_attach_driver+0x28c/0x4c0 drivers/base/dd.c:962 bus_for_each_drv+0x154/0x1e4 drivers/base/bus.c:429 __device_attach+0x2a4/0x3d8 drivers/base/dd.c:1034 device_initial_probe+0x24/0x34 drivers/base/dd.c:1083 bus_probe_device+0xbc/0x1c4 drivers/base/bus.c:489 device_add+0x93c/0xe4c drivers/base/core.c:3712 platform_device_add+0x3f8/0x6f4 drivers/base/platform.c:717 vhci_hcd_init+0x390/0x4b0 drivers/usb/usbip/vhci_hcd.c:1571 do_one_initcall+0x278/0x9f0 init/main.c:1309 do_initcall_level+0x158/0x214 init/main.c:1382 do_initcalls+0x58/0xac init/main.c:1398 do_basic_setup+0x8c/0xa0 init/main.c:1417 kernel_init_freeable+0x35c/0x4f0 init/main.c:1637 kernel_init+0x24/0x1d8 init/main.c:1525 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850 The buggy address belongs to the object at ffff0000d052ca00 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 112 bytes to the right of 128-byte region [ffff0000d052ca00, ffff0000d052ca80) The buggy address belongs to the physical page: page:00000000d7fa960a refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11052c flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000200 0000000000000000 dead000000000001 ffff0000c0002300 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000d052c980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000d052ca00: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc >ffff0000d052ca80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff0000d052cb00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000d052cb80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== ------------[ cut here ]------------ WARNING: CPU: 0 PID: 7186 at drivers/usb/gadget/udc/dummy_hcd.c:690 dummy_free_request+0x7c/0x84 drivers/usb/gadget/udc/dummy_hcd.c:690 Modules linked in: CPU: 0 PID: 7186 Comm: syz.1.1175 Tainted: G B syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026 pstate: 82400005 (Nzcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : dummy_free_request+0x7c/0x84 drivers/usb/gadget/udc/dummy_hcd.c:690 lr : dummy_free_request+0x7c/0x84 drivers/usb/gadget/udc/dummy_hcd.c:690 sp : ffff8000246274d0 x29: ffff8000246274d0 x28: ffff0000de4384a0 x27: 1fffe0001bc87094 x26: ffff0000dd78a950 x25: dfff800000000000 x24: 0000000000000003 x23: dfff800000000000 x22: ffff80001537d160 x21: ffff800013110c00 x20: ffff0000d1bc0068 x19: ffff0000d052caf0 x18: 1fffe00033e7277e x17: 0000000000000000 x16: ffff800008043b30 x15: 0000000000000002 x14: 0000000000000001 x13: 1ffff00002ff016c x12: 0000000000080000 x11: 00000000000368e5 x10: ffff8000227ab000 x9 : ffff80000dcedb00 x8 : 00000000000368e6 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff800024626eb8 x4 : ffff800015464e80 x3 : ffff800008195a38 x2 : 0000000000000001 x1 : 0000000000000000 x0 : 0000000000000001 Call trace: dummy_free_request+0x7c/0x84 drivers/usb/gadget/udc/dummy_hcd.c:690 usb_ep_free_request+0x138/0x34c drivers/usb/gadget/udc/core.c:221 uvc_function_bind+0x8b0/0xfe8 drivers/usb/gadget/function/f_uvc.c:789 usb_add_function+0x234/0x7a8 drivers/usb/gadget/composite.c:337 configfs_composite_bind+0x7e0/0xce4 drivers/usb/gadget/configfs.c:1409 gadget_bind_driver+0x26c/0x684 drivers/usb/gadget/udc/core.c:1651 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x3a0/0xac4 drivers/base/dd.c:638 __driver_probe_device+0x1c8/0x368 drivers/base/dd.c:804 driver_probe_device+0x78/0x324 drivers/base/dd.c:834 __driver_attach+0x3bc/0x614 drivers/base/dd.c:1220 bus_for_each_dev+0x148/0x1d0 drivers/base/bus.c:303 driver_attach+0x50/0x60 drivers/base/dd.c:1237 bus_add_driver+0x2c0/0x518 drivers/base/bus.c:620 driver_register+0x200/0x37c drivers/base/driver.c:246 usb_gadget_register_driver_owner+0xf0/0x25c drivers/usb/gadget/udc/core.c:1730 gadget_dev_desc_UDC_store+0x168/0x268 drivers/usb/gadget/configfs.c:290 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x260/0x338 fs/configfs/file.c:229 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x3c8/0x7c8 fs/read_write.c:584 ksys_write+0x12c/0x228 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __arm64_sys_write+0x7c/0x90 fs/read_write.c:646 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x5c/0x134 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 irq event stamp: 959 hardirqs last enabled at (959): [] raw_spin_rq_unlock_irq kernel/sched/sched.h:1374 [inline] hardirqs last enabled at (959): [] finish_lock_switch+0xb0/0x1c8 kernel/sched/core.c:5005 hardirqs last disabled at (958): [] __schedule+0x294/0x1a6c kernel/sched/core.c:6461 softirqs last enabled at (170): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (168): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]--- udc dummy_udc.0: failed to start g1: -22 configfs-gadget.g1: probe of gadget.0 failed with error -22 UDC core: g1: couldn't find an available UDC or it's busy