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:00007fdeaa1c9028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007fdeab9f7fa0 RCX: 00007fdeab771b19 RDX: 00000000000001ff RSI: 00002000000000c0 RDI: ffffffffffffff9c RBP: 00007fdeab809b70 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fdeab9f8038 R14: 00007fdeab9f7fa0 R15: 00007ffdf6c41798 ================================================================== BUG: KASAN: use-after-free in android_device_destroy drivers/usb/gadget/configfs.c:1820 [inline] BUG: KASAN: use-after-free in gadgets_drop+0x40/0xd0 drivers/usb/gadget/configfs.c:1902 Read of size 8 at addr ffff88810fc95550 by task syz.0.9/343 CPU: 1 PID: 343 Comm: syz.0.9 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x1a7/0x208 lib/dump_stack.c:118 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0x100/0x140 mm/kasan/report.c:452 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309 android_device_destroy drivers/usb/gadget/configfs.c:1820 [inline] gadgets_drop+0x40/0xd0 drivers/usb/gadget/configfs.c:1902 client_drop_item+0x94/0xc0 fs/configfs/dir.c:985 configfs_mkdir+0xaca/0xd90 fs/configfs/dir.c:1477 vfs_mkdir+0x42c/0x600 fs/namei.c:3840 do_mkdirat+0x14c/0x340 fs/namei.c:3862 __do_sys_mkdirat fs/namei.c:3873 [inline] __se_sys_mkdirat fs/namei.c:3871 [inline] __x64_sys_mkdirat+0x7b/0x90 fs/namei.c:3871 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fdeab771b19 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:00007fdeaa1c9028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007fdeab9f7fa0 RCX: 00007fdeab771b19 RDX: 00000000000001ff RSI: 00002000000000c0 RDI: ffffffffffffff9c RBP: 00007fdeab809b70 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fdeab9f8038 R14: 00007fdeab9f7fa0 R15: 00007ffdf6c41798 Allocated by task 343: 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:430 [inline] ____kasan_kmalloc mm/kasan/common.c:509 [inline] __kasan_kmalloc+0xd4/0x100 mm/kasan/common.c:518 kasan_kmalloc include/linux/kasan.h:254 [inline] kmem_cache_alloc_trace+0x179/0x2e0 mm/slub.c:2979 kmalloc include/linux/slab.h:555 [inline] kzalloc include/linux/slab.h:667 [inline] gadgets_make+0x57/0xa70 drivers/usb/gadget/configfs.c:1840 configfs_mkdir+0x5d2/0xd90 fs/configfs/dir.c:1378 vfs_mkdir+0x42c/0x600 fs/namei.c:3840 do_mkdirat+0x14c/0x340 fs/namei.c:3862 __do_sys_mkdirat fs/namei.c:3873 [inline] __se_sys_mkdirat fs/namei.c:3871 [inline] __x64_sys_mkdirat+0x7b/0x90 fs/namei.c:3871 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb Freed by task 343: 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:362 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:370 kasan_slab_free include/linux/kasan.h:220 [inline] slab_free_hook mm/slub.c:1600 [inline] slab_free_freelist_hook+0xc5/0x190 mm/slub.c:1626 slab_free mm/slub.c:3208 [inline] kfree+0xc0/0x270 mm/slub.c:4196 gadget_info_attr_release+0xcb/0xf0 drivers/usb/gadget/configfs.c:429 config_item_cleanup fs/configfs/item.c:130 [inline] config_item_release fs/configfs/item.c:139 [inline] kref_put include/linux/kref.h:65 [inline] config_item_put+0x158/0x210 fs/configfs/item.c:151 gadgets_drop+0x23/0xd0 drivers/usb/gadget/configfs.c:1901 client_drop_item+0x94/0xc0 fs/configfs/dir.c:985 configfs_mkdir+0xaca/0xd90 fs/configfs/dir.c:1477 vfs_mkdir+0x42c/0x600 fs/namei.c:3840 do_mkdirat+0x14c/0x340 fs/namei.c:3862 __do_sys_mkdirat fs/namei.c:3873 [inline] __se_sys_mkdirat fs/namei.c:3871 [inline] __x64_sys_mkdirat+0x7b/0x90 fs/namei.c:3871 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff88810fc95000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1360 bytes inside of 2048-byte region [ffff88810fc95000, ffff88810fc95800) The buggy address belongs to the page: page:ffffea00043f2400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10fc90 head:ffffea00043f2400 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100042d80 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 343, ts 22669821793, free_ts 22653565718 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x176/0x190 mm/page_alloc.c:2462 get_page_from_freelist+0x225f/0x23f0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x29a/0x640 mm/page_alloc.c:5384 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1813 [inline] new_slab+0x84/0x3f0 mm/slub.c:1874 new_slab_objects mm/slub.c:2632 [inline] ___slab_alloc+0x2f8/0x4c0 mm/slub.c:2796 __slab_alloc+0x63/0xa0 mm/slub.c:2836 slab_alloc_node mm/slub.c:2918 [inline] slab_alloc mm/slub.c:2960 [inline] kmem_cache_alloc_trace+0x1a8/0x2e0 mm/slub.c:2977 kmalloc include/linux/slab.h:555 [inline] kzalloc include/linux/slab.h:667 [inline] alloc_super+0x5a/0x7d0 fs/super.c:203 sget_fc+0x2c9/0x700 fs/super.c:544 vfs_get_super fs/super.c:1220 [inline] get_tree_nodev+0x2a/0x160 fs/super.c:1255 proc_get_tree+0x1c/0x20 fs/proc/root.c:229 vfs_get_tree+0x89/0x260 fs/super.c:1583 do_new_mount+0x25a/0xa30 fs/namespace.c:3006 path_mount+0x581/0xca0 fs/namespace.c:3336 do_mount fs/namespace.c:3349 [inline] __do_sys_mount fs/namespace.c:3557 [inline] __se_sys_mount+0x320/0x390 fs/namespace.c:3534 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3534 page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1349 [inline] __free_pages_ok+0x80b/0x830 mm/page_alloc.c:1629 free_the_page mm/page_alloc.c:5445 [inline] __free_pages+0xd8/0x390 mm/page_alloc.c:5454 __free_slab+0xcf/0x190 mm/slub.c:1899 free_slab mm/slub.c:1914 [inline] discard_slab mm/slub.c:1920 [inline] unfreeze_partials+0x150/0x180 mm/slub.c:2415 put_cpu_partial+0xc1/0x180 mm/slub.c:2451 __slab_free+0x2c9/0x3a0 mm/slub.c:3100 do_slab_free mm/slub.c:3196 [inline] ___cache_free+0x10e/0x130 mm/slub.c:3215 qlink_free+0x50/0x90 mm/kasan/quarantine.c:157 qlist_free_all+0x5f/0xb0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14a/0x160 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:440 kasan_slab_alloc include/linux/kasan.h:244 [inline] slab_post_alloc_hook+0x5d/0x2f0 mm/slab.h:580 slab_alloc_node mm/slub.c:2952 [inline] slab_alloc mm/slub.c:2960 [inline] kmem_cache_alloc+0x15a/0x2d0 mm/slub.c:2965 inotify_new_watch fs/notify/inotify/inotify_user.c:568 [inline] inotify_update_watch fs/notify/inotify/inotify_user.c:616 [inline] __do_sys_inotify_add_watch fs/notify/inotify/inotify_user.c:771 [inline] __se_sys_inotify_add_watch+0x636/0xbb0 fs/notify/inotify/inotify_user.c:697 __x64_sys_inotify_add_watch+0x7b/0x90 fs/notify/inotify/inotify_user.c:697 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 Memory state around the buggy address: ffff88810fc95400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88810fc95480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88810fc95500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88810fc95580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88810fc95600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess): 0: ff c3 inc %ebx 2: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) 9: 00 00 00 c: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 11: 48 89 f8 mov %rdi,%rax 14: 48 89 f7 mov %rsi,%rdi 17: 48 89 d6 mov %rdx,%rsi 1a: 48 89 ca mov %rcx,%rdx 1d: 4d 89 c2 mov %r8,%r10 20: 4d 89 c8 mov %r9,%r8 23: 4c 8b 4c 24 08 mov 0x8(%rsp),%r9 28: 0f 05 syscall * 2a: 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax <-- trapping instruction 30: 73 01 jae 0x33 32: c3 ret 33: 48 c7 c1 e8 ff ff ff mov $0xffffffffffffffe8,%rcx 3a: f7 d8 neg %eax 3c: 64 89 01 mov %eax,%fs:(%rcx) 3f: 48 rex.W