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 ffff0000d7c465f0 by task syz.0.2035/10282

CPU: 1 PID: 10282 Comm: syz.0.2035 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 10259:
 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]
 __do_kmalloc_node mm/slab_common.c:936 [inline]
 __kmalloc+0xd8/0x180 mm/slab_common.c:949
 kmalloc include/linux/slab.h:568 [inline]
 copy_gadget_strings drivers/usb/gadget/composite.c:1414 [inline]
 usb_gstrings_attach+0xb8/0x694 drivers/usb/gadget/composite.c:1480
 configfs_composite_bind+0x350/0xce4 drivers/usb/gadget/configfs.c:1343
 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

Freed by task 10259:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:53
 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:516
 ____kasan_slab_free+0x148/0x1b0 mm/kasan/common.c:237
 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:245
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1729 [inline]
 slab_free_freelist_hook+0x16c/0x1e8 mm/slub.c:1755
 slab_free mm/slub.c:3687 [inline]
 __kmem_cache_free+0xbc/0x21c mm/slub.c:3700
 kfree+0xd0/0x1a8 mm/slab_common.c:988
 composite_dev_cleanup+0x120/0x564 drivers/usb/gadget/composite.c:2390
 configfs_composite_unbind+0xa4/0x198 drivers/usb/gadget/configfs.c:1454
 gadget_unbind_driver+0x188/0x35c drivers/usb/gadget/udc/core.c:1702
 device_remove drivers/base/dd.c:547 [inline]
 __device_release_driver drivers/base/dd.c:1279 [inline]
 device_release_driver_internal+0x3d4/0x6e4 drivers/base/dd.c:1305
 driver_detach+0x1e8/0x2ac drivers/base/dd.c:1368
 bus_remove_driver+0x120/0x240 drivers/base/bus.c:679
 driver_unregister+0x78/0xac drivers/base/driver.c:274
 usb_gadget_unregister_driver+0x50/0x78 drivers/usb/gadget/udc/core.c:1762
 unregister_gadget drivers/usb/gadget/configfs.c:253 [inline]
 gadget_dev_desc_UDC_store+0x124/0x268 drivers/usb/gadget/configfs.c:280
 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

Last potentially related work creation:
 kasan_save_stack+0x40/0x70 mm/kasan/common.c:46
 __kasan_record_aux_stack+0xc0/0xdc mm/kasan/generic.c:486
 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496
 kvfree_call_rcu+0xb4/0x6f0 kernel/rcu/tree.c:3405
 kernfs_unlink_open_file+0x370/0x41c fs/kernfs/file.c:653
 kernfs_fop_release+0x128/0x194 fs/kernfs/file.c:825
 __fput+0x1b4/0x7b0 fs/file_table.c:320
 ____fput+0x20/0x30 fs/file_table.c:348
 task_work_run+0x1f4/0x280 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 do_notify_resume+0x20f8/0x2c84 arch/arm64/kernel/signal.c:1151
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
 el0_svc+0x98/0x128 arch/arm64/kernel/entry-common.c:638
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

Second to last potentially related work creation:
 kasan_save_stack+0x40/0x70 mm/kasan/common.c:46
 __kasan_record_aux_stack+0xc0/0xdc mm/kasan/generic.c:486
 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496
 kvfree_call_rcu+0xb4/0x6f0 kernel/rcu/tree.c:3405
 __hw_addr_flush net/core/dev_addr_lists.c:490 [inline]
 dev_addr_flush+0x144/0x1e0 net/core/dev_addr_lists.c:535
 free_netdev+0x1b0/0x428 net/core/dev.c:10892
 netdev_run_todo+0xbac/0xd60 net/core/dev.c:10554
 rtnl_unlock+0x14/0x20 net/core/rtnetlink.c:147
 tun_detach drivers/net/tun.c:704 [inline]
 tun_chr_close+0x148/0x1f4 drivers/net/tun.c:3495
 __fput+0x1b4/0x7b0 fs/file_table.c:320
 ____fput+0x20/0x30 fs/file_table.c:348
 task_work_run+0x1f4/0x280 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 do_notify_resume+0x20f8/0x2c84 arch/arm64/kernel/signal.c:1151
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
 el0_svc+0x98/0x128 arch/arm64/kernel/entry-common.c:638
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

The buggy address belongs to the object at ffff0000d7c46500
 which belongs to the cache kmalloc-128 of size 128
The buggy address is located 112 bytes to the right of
 128-byte region [ffff0000d7c46500, ffff0000d7c46580)

The buggy address belongs to the physical page:
page:000000008a8d84fd refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x117c46
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:
 ffff0000d7c46480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000d7c46500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff0000d7c46580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                                             ^
 ffff0000d7c46600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000d7c46680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
------------[ cut here ]------------
WARNING: CPU: 1 PID: 10282 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: 1 PID: 10282 Comm: syz.0.2035 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 : ffff8000219474d0
x29: ffff8000219474d0 x28: ffff0000dc56b4a0 x27: 1fffe0001b8ad694
x26: ffff0000d3ad6150 x25: dfff800000000000 x24: 0000000000000003
x23: dfff800000000000 x22: ffff80001537d160 x21: ffff800013110c00
x20: ffff0000d1f48068 x19: ffff0000d7c465f0 x18: 1fffe00033e7697e
x17: 0000000000000000 x16: ffff800008043b30 x15: 0000000000000002
x14: 0000000000000001 x13: 1ffff00002ff016c x12: 0000000000080000
x11: 00000000000481cc x10: ffff8000225eb000 x9 : ffff80000dcedfc0
x8 : 00000000000481cd x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff800021946eb8 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: 1135
hardirqs last  enabled at (1135): [<ffff80000825abe0>] raw_spin_rq_unlock_irq kernel/sched/sched.h:1374 [inline]
hardirqs last  enabled at (1135): [<ffff80000825abe0>] finish_lock_switch+0xb0/0x1c8 kernel/sched/core.c:5005
hardirqs last disabled at (1134): [<ffff800011c635b8>] __schedule+0x294/0x1a6c kernel/sched/core.c:6461
softirqs last  enabled at (754): [<ffff800008031254>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32
softirqs last disabled at (752): [<ffff800008031220>] 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