udc dummy_udc.0: failed to start USB Gadget filesystem: -12 gadgetfs: probe of gadget.0 failed with error -12 udc dummy_udc.1: failed to start USB Gadget filesystem: -12 gadgetfs: probe of gadget.1 failed with error -12 ================================================================== BUG: KASAN: use-after-free in gadgetfs_bind+0xcf/0x820 drivers/usb/gadget/legacy/inode.c:1677 Write of size 8 at addr ffff888146f600c0 by task syz.7.1624/10683 CPU: 1 PID: 10683 Comm: syz.7.1624 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0xa8/0x210 mm/kasan/report.c:420 kasan_report+0x10b/0x140 mm/kasan/report.c:524 gadgetfs_bind+0xcf/0x820 drivers/usb/gadget/legacy/inode.c:1677 gadget_bind_driver+0x2af/0x760 drivers/usb/gadget/udc/core.c:1651 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x24a/0xb40 drivers/base/dd.c:638 __driver_probe_device+0x1f5/0x390 drivers/base/dd.c:804 driver_probe_device+0x4f/0x420 drivers/base/dd.c:834 __driver_attach+0x43d/0x6c0 drivers/base/dd.c:1220 bus_for_each_dev+0x182/0x1f0 drivers/base/bus.c:303 bus_add_driver+0x324/0x5d0 drivers/base/bus.c:620 driver_register+0x32d/0x430 drivers/base/driver.c:246 usb_gadget_register_driver_owner+0xf5/0x260 drivers/usb/gadget/udc/core.c:1730 dev_config+0xe45/0x1260 drivers/usb/gadget/legacy/inode.c:1878 vfs_write+0x2dc/0x9a0 fs/read_write.c:582 ksys_write+0x14d/0x260 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f399f59e159 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f39a04d8028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f399f825fa0 RCX: 00007f399f59e159 RDX: 000000000000001f RSI: 0000200000000400 RDI: 0000000000000003 RBP: 00007f399f635024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f399f826038 R14: 00007f399f825fa0 R15: 00007ffea7e2b618 Allocated by task 4283: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0x8e/0xa0 mm/kasan/common.c:384 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] dev_new drivers/usb/gadget/legacy/inode.c:170 [inline] gadgetfs_fill_super+0x30d/0x610 drivers/usb/gadget/legacy/inode.c:2049 vfs_get_super fs/super.c:1222 [inline] get_tree_single+0xb5/0x160 fs/super.c:1260 vfs_get_tree+0x88/0x270 fs/super.c:1584 do_new_mount+0x247/0xa40 fs/namespace.c:3078 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3606 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Freed by task 10683: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516 ____kasan_slab_free+0x126/0x1f0 mm/kasan/common.c:237 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1729 [inline] slab_free_freelist_hook+0x133/0x1b0 mm/slub.c:1755 slab_free mm/slub.c:3687 [inline] __kmem_cache_free+0xb6/0x200 mm/slub.c:3700 gadgetfs_bind+0x6d2/0x820 drivers/usb/gadget/legacy/inode.c:1698 gadget_bind_driver+0x2af/0x760 drivers/usb/gadget/udc/core.c:1651 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x24a/0xb40 drivers/base/dd.c:638 __driver_probe_device+0x1f5/0x390 drivers/base/dd.c:804 driver_probe_device+0x4f/0x420 drivers/base/dd.c:834 __driver_attach+0x43d/0x6c0 drivers/base/dd.c:1220 bus_for_each_dev+0x182/0x1f0 drivers/base/bus.c:303 bus_add_driver+0x324/0x5d0 drivers/base/bus.c:620 driver_register+0x32d/0x430 drivers/base/driver.c:246 usb_gadget_register_driver_owner+0xf5/0x260 drivers/usb/gadget/udc/core.c:1730 dev_config+0xe45/0x1260 drivers/usb/gadget/legacy/inode.c:1878 vfs_write+0x2dc/0x9a0 fs/read_write.c:582 ksys_write+0x14d/0x260 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff888146f60000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 192 bytes inside of 1024-byte region [ffff888146f60000, ffff888146f60400) The buggy address belongs to the physical page: page:ffffea00051bd800 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888146f60800 pfn:0x146f60 head:ffffea00051bd800 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x57ff00000010200(slab|head|node=1|zone=2|lastcpupid=0x7ff) raw: 057ff00000010200 ffff888140000888 ffffea00050efa08 ffff888017441dc0 raw: ffff888146f60800 000000000010000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 11591805751, free_ts 0 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2560 prep_new_page mm/page_alloc.c:2567 [inline] get_page_from_freelist+0x206b/0x2180 mm/page_alloc.c:4358 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5658 alloc_page_interleave+0x24/0x1e0 mm/mempolicy.c:2115 alloc_slab_page+0x5d/0x180 mm/slub.c:1799 allocate_slab mm/slub.c:1944 [inline] new_slab+0x87/0x2d0 mm/slub.c:1997 ___slab_alloc+0xbc5/0x1240 mm/slub.c:3154 __slab_alloc mm/slub.c:3240 [inline] slab_alloc_node mm/slub.c:3325 [inline] __kmem_cache_alloc_node+0x126/0x270 mm/slub.c:3398 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1026 kmalloc include/linux/slab.h:563 [inline] kzalloc include/linux/slab.h:699 [inline] dev_pm_qos_constraints_allocate+0x4f/0x3f0 drivers/base/power/qos.c:200 __dev_pm_qos_add_request+0x11a/0x530 drivers/base/power/qos.c:344 dev_pm_qos_add_request+0x32/0x50 drivers/base/power/qos.c:394 usb_hub_create_port_device+0x44b/0xaf0 drivers/usb/core/port.c:720 hub_configure drivers/usb/core/hub.c:1708 [inline] hub_probe+0x2671/0x3790 drivers/usb/core/hub.c:1975 usb_probe_interface+0x5be/0xae0 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x24a/0xb40 drivers/base/dd.c:638 page_owner free stack trace missing Memory state around the buggy address: ffff888146f5ff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888146f60000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888146f60080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888146f60100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888146f60180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================