do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606 ================================================================== BUG: KASAN: slab-use-after-free in __list_del_entry_valid_or_report+0x3c/0x1b8 lib/list_debug.c:49 Read of size 8 at addr ffff0000c1d23e58 by task syz.0.97/5232 CPU: 0 UID: 0 PID: 5232 Comm: syz.0.97 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/23/2026 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 print_address_description+0xb0/0x238 mm/kasan/report.c:378 print_report+0x68/0x84 mm/kasan/report.c:482 kasan_report+0x8c/0xc4 mm/kasan/report.c:595 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 __list_del_entry_valid_or_report+0x3c/0x1b8 lib/list_debug.c:49 __list_del_entry_valid include/linux/list.h:140 [inline] __list_del_entry include/linux/list.h:261 [inline] list_del include/linux/list.h:275 [inline] uvcg_extension_drop+0x88/0x1e0 drivers/usb/gadget/function/uvc_configfs.c:1260 client_drop_item+0x98/0xcc fs/configfs/dir.c:979 configfs_mkdir+0x664/0x7d4 fs/configfs/dir.c:1452 vfs_mkdir+0x2ec/0x4cc fs/namei.c:5428 filename_mkdirat+0x228/0x420 fs/namei.c:5461 __do_sys_mkdirat fs/namei.c:5482 [inline] __se_sys_mkdirat fs/namei.c:5479 [inline] __arm64_sys_mkdirat+0x9c/0xc0 fs/namei.c:5479 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606 Allocated by task 5232: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:78 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:570 poison_kmalloc_redzone mm/kasan/common.c:409 [inline] __kasan_kmalloc+0x9c/0xb4 mm/kasan/common.c:426 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x2f4/0x5fc mm/slub.c:5680 _kmalloc_noprof include/linux/slab.h:991 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] uvcg_extension_make+0x9c/0x2a0 drivers/usb/gadget/function/uvc_configfs.c:1276 configfs_mkdir+0x3d8/0x7d4 fs/configfs/dir.c:1378 vfs_mkdir+0x2ec/0x4cc fs/namei.c:5428 filename_mkdirat+0x228/0x420 fs/namei.c:5461 __do_sys_mkdirat fs/namei.c:5482 [inline] __se_sys_mkdirat fs/namei.c:5479 [inline] __arm64_sys_mkdirat+0x9c/0xc0 fs/namei.c:5479 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606 Freed by task 5232: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:78 kasan_save_free_info+0x54/0x6c mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:264 [inline] __kasan_slab_free+0x74/0xa4 mm/kasan/common.c:296 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2780 [inline] slab_free mm/slub.c:6630 [inline] kfree+0x188/0x658 mm/slub.c:6923 uvcg_extension_release+0x20/0x30 drivers/usb/gadget/function/uvc_configfs.c:1183 config_item_cleanup fs/configfs/item.c:128 [inline] config_item_release+0x124/0x278 fs/configfs/item.c:137 kref_put include/linux/kref.h:65 [inline] config_item_put+0x60/0xc8 fs/configfs/item.c:149 uvcg_extension_drop+0x7c/0x1e0 drivers/usb/gadget/function/uvc_configfs.c:1259 client_drop_item+0x98/0xcc fs/configfs/dir.c:979 configfs_mkdir+0x664/0x7d4 fs/configfs/dir.c:1452 vfs_mkdir+0x2ec/0x4cc fs/namei.c:5428 filename_mkdirat+0x228/0x420 fs/namei.c:5461 __do_sys_mkdirat fs/namei.c:5482 [inline] __se_sys_mkdirat fs/namei.c:5479 [inline] __arm64_sys_mkdirat+0x9c/0xc0 fs/namei.c:5479 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606 The buggy address belongs to the object at ffff0000c1d23e00 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 88 bytes inside of freed 192-byte region [ffff0000c1d23e00, ffff0000c1d23ec0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x101d23 flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff) page_type: f5(slab) raw: 05ffc00000000000 ffff0000c00013c0 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000c1d23d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff0000c1d23d80: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000c1d23e00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000c1d23e80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff0000c1d23f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== rxe_eth0 speed is unknown, defaulting to 1000