RBP: 00007f013814aad8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f013833b038 R14: 00007f013833afa0 R15: 00007ffd7837f1c8 ================================================================== BUG: KASAN: use-after-free in android_device_destroy drivers/usb/gadget/configfs.c:1819 [inline] BUG: KASAN: use-after-free in gadgets_drop+0x40/0xd0 drivers/usb/gadget/configfs.c:1901 Read of size 8 at addr ffff888110580550 by task syz.3.19/368 CPU: 1 PID: 368 Comm: syz.3.19 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0x10f/0x150 mm/kasan/report.c:444 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309 android_device_destroy drivers/usb/gadget/configfs.c:1819 [inline] gadgets_drop+0x40/0xd0 drivers/usb/gadget/configfs.c:1901 client_drop_item+0x94/0xc0 fs/configfs/dir.c:962 configfs_mkdir+0x7f1/0x9c0 fs/configfs/dir.c:1444 vfs_mkdir+0x38b/0x590 fs/namei.c:4073 do_mkdirat+0x174/0x4d0 fs/namei.c:4098 __do_sys_mkdirat fs/namei.c:4113 [inline] __se_sys_mkdirat fs/namei.c:4111 [inline] __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4111 x64_sys_call+0x37e/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:259 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f01380b3559 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:00007f0136b0c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f013833afa0 RCX: 00007f01380b3559 RDX: 00000000000001ff RSI: 0000200000000680 RDI: ffffffffffffff9c RBP: 00007f013814aad8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f013833b038 R14: 00007f013833afa0 R15: 00007ffd7837f1c8 Allocated by task 368: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:433 [inline] ____kasan_kmalloc mm/kasan/common.c:512 [inline] __kasan_kmalloc+0xd4/0x100 mm/kasan/common.c:521 kasan_kmalloc include/linux/kasan.h:227 [inline] kmem_cache_alloc_trace+0x119/0x270 mm/slub.c:3274 kmalloc include/linux/slab.h:619 [inline] kzalloc include/linux/slab.h:750 [inline] gadgets_make+0x57/0xa70 drivers/usb/gadget/configfs.c:1839 configfs_mkdir+0x50a/0x9c0 fs/configfs/dir.c:1360 vfs_mkdir+0x38b/0x590 fs/namei.c:4073 do_mkdirat+0x174/0x4d0 fs/namei.c:4098 __do_sys_mkdirat fs/namei.c:4113 [inline] __se_sys_mkdirat fs/namei.c:4111 [inline] __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4111 x64_sys_call+0x37e/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:259 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Freed by task 368: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4a/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:365 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373 kasan_slab_free include/linux/kasan.h:193 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1754 slab_free mm/slub.c:3526 [inline] kfree+0xc4/0x270 mm/slub.c:4588 gadget_info_attr_release+0xcb/0xf0 drivers/usb/gadget/configfs.c:429 config_item_cleanup fs/configfs/item.c:128 [inline] config_item_release fs/configfs/item.c:137 [inline] kref_put include/linux/kref.h:65 [inline] config_item_put+0x158/0x210 fs/configfs/item.c:149 gadgets_drop+0x23/0xd0 drivers/usb/gadget/configfs.c:1900 client_drop_item+0x94/0xc0 fs/configfs/dir.c:962 configfs_mkdir+0x7f1/0x9c0 fs/configfs/dir.c:1444 vfs_mkdir+0x38b/0x590 fs/namei.c:4073 do_mkdirat+0x174/0x4d0 fs/namei.c:4098 __do_sys_mkdirat fs/namei.c:4113 [inline] __se_sys_mkdirat fs/namei.c:4111 [inline] __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4111 x64_sys_call+0x37e/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:259 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff888110580000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1360 bytes inside of 2048-byte region [ffff888110580000, ffff888110580800) The buggy address belongs to the page: page:ffffea0004416000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x110580 head:ffffea0004416000 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 dead000000000122 ffff888100043200 raw: 0000000000000000 0000000000080008 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 0x1d2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 368, ts 25014514688, free_ts 24895873545 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2607 prep_new_page+0x1c/0x110 mm/page_alloc.c:2613 get_page_from_freelist+0x2c3a/0x2cd0 mm/page_alloc.c:4487 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5824 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1937 [inline] new_slab+0xa0/0x4d0 mm/slub.c:2000 ___slab_alloc+0x3ac/0x840 mm/slub.c:3033 __slab_alloc+0x49/0x90 mm/slub.c:3120 slab_alloc_node mm/slub.c:3211 [inline] slab_alloc mm/slub.c:3255 [inline] __kmalloc_track_caller+0x169/0x2c0 mm/slub.c:4954 kmalloc_reserve net/core/skbuff.c:357 [inline] __alloc_skb+0x210/0x730 net/core/skbuff.c:428 alloc_skb include/linux/skbuff.h:1183 [inline] nlmsg_new include/net/netlink.h:953 [inline] audit_buffer_alloc kernel/audit.c:1806 [inline] audit_log_start+0x407/0x8a0 kernel/audit.c:1924 common_lsm_audit+0xd2/0x1670 security/lsm_audit.c:457 slow_avc_audit+0x1c4/0x240 security/selinux/avc.c:802 audit_inode_permission+0x1a3/0x270 security/selinux/hooks.c:3180 selinux_inode_permission+0x50c/0x5f0 security/selinux/hooks.c:3225 security_inode_permission+0xa0/0x100 security/security.c:1330 inode_permission+0xef/0x4a0 fs/namei.c:534 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1474 [inline] free_pcp_prepare mm/page_alloc.c:1546 [inline] free_unref_page_prepare+0x5fa/0x600 mm/page_alloc.c:3536 free_unref_page+0xae/0x540 mm/page_alloc.c:3618 free_the_page mm/page_alloc.c:805 [inline] __free_pages+0x6c/0x100 mm/page_alloc.c:5900 __free_slab+0xe5/0x1e0 mm/slub.c:2025 free_slab mm/slub.c:2040 [inline] discard_slab mm/slub.c:2046 [inline] __unfreeze_partials+0x15a/0x190 mm/slub.c:2532 put_cpu_partial+0xc6/0x120 mm/slub.c:2612 __slab_free+0x1d4/0x290 mm/slub.c:3395 do_slab_free mm/slub.c:3514 [inline] ___cache_free+0x104/0x120 mm/slub.c:3535 qlink_free+0x4d/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x5f/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14a/0x170 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:443 kasan_slab_alloc include/linux/kasan.h:217 [inline] slab_post_alloc_hook+0x4f/0x2b0 mm/slab.h:550 slab_alloc_node mm/slub.c:3245 [inline] slab_alloc mm/slub.c:3255 [inline] kmem_cache_alloc_trace+0xfb/0x270 mm/slub.c:3272 kmalloc include/linux/slab.h:619 [inline] kzalloc include/linux/slab.h:750 [inline] usb_alloc_dev+0x5d/0xcd0 drivers/usb/core/usb.c:704 hub_port_connect drivers/usb/core/hub.c:5462 [inline] hub_port_connect_change drivers/usb/core/hub.c:5700 [inline] port_event drivers/usb/core/hub.c:5866 [inline] hub_event+0x1f51/0x43f0 drivers/usb/core/hub.c:5948 Memory state around the buggy address: ffff888110580400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888110580480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888110580500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888110580580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888110580600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================