================================================================== BUG: KASAN: slab-out-of-bounds in memcpy_to_page include/linux/highmem.h:403 [inline] BUG: KASAN: slab-out-of-bounds in z_erofs_transform_plain+0x3a4/0x490 fs/erofs/decompressor.c:346 Read of size 4096 at addr ffff0000cb688000 by task syz.5.91/4933 CPU: 0 PID: 4933 Comm: syz.5.91 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/02/2026 Call trace: dump_backtrace+0x1c0/0x1ec 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 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x258/0x290 mm/kasan/generic.c:189 memcpy+0x48/0x90 mm/kasan/shadow.c:65 memcpy_to_page include/linux/highmem.h:403 [inline] z_erofs_transform_plain+0x3a4/0x490 fs/erofs/decompressor.c:346 z_erofs_decompress+0x9c/0xd4 fs/erofs/decompressor.c:434 z_erofs_decompress_pcluster fs/erofs/zdata.c:1159 [inline] z_erofs_decompress_queue+0x100c/0x1b40 fs/erofs/zdata.c:1240 z_erofs_runqueue+0x152c/0x16cc fs/erofs/zdata.c:1603 z_erofs_read_folio+0x2d8/0x5c8 fs/erofs/zdata.c:1693 filemap_read_folio+0x134/0x384 mm/filemap.c:2490 filemap_fault+0x98c/0xe98 mm/filemap.c:3340 __do_fault+0x11c/0x3d8 mm/memory.c:4278 do_read_fault mm/memory.c:4629 [inline] do_fault mm/memory.c:4758 [inline] handle_pte_fault mm/memory.c:5029 [inline] __handle_mm_fault mm/memory.c:5171 [inline] handle_mm_fault+0x1cac/0x2fb0 mm/memory.c:5292 __do_page_fault arch/arm64/mm/fault.c:499 [inline] do_page_fault+0x310/0x98c arch/arm64/mm/fault.c:583 do_translation_fault+0x94/0xc8 arch/arm64/mm/fault.c:667 do_mem_abort+0x70/0x194 arch/arm64/mm/fault.c:804 el0_da+0x70/0x144 arch/arm64/kernel/entry-common.c:515 el0t_64_sync_handler+0x90/0xf0 arch/arm64/kernel/entry-common.c:658 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Allocated by task 1: 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_slab_alloc+0x70/0x88 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook+0x74/0x430 mm/slab.h:737 slab_alloc_node mm/slub.c:3359 [inline] slab_alloc mm/slub.c:3367 [inline] __kmem_cache_alloc_lru mm/slub.c:3374 [inline] kmem_cache_alloc+0x22c/0x308 mm/slub.c:3383 kmem_cache_zalloc include/linux/slab.h:689 [inline] __kernfs_new_node+0xec/0x5f4 fs/kernfs/dir.c:614 kernfs_new_node+0x11c/0x22c fs/kernfs/dir.c:690 __kernfs_create_file+0x60/0x2d4 fs/kernfs/file.c:1068 sysfs_add_file_mode_ns+0x1d8/0x294 fs/sysfs/file.c:294 sysfs_merge_group+0x164/0x2ac fs/sysfs/group.c:342 dpm_sysfs_add+0x12c/0x26c drivers/base/power/sysfs.c:712 device_add+0x6c8/0xefc drivers/base/core.c:3654 usb_new_device+0x7f8/0x11e4 drivers/usb/core/hub.c:2659 register_root_hub+0x220/0x51c drivers/usb/core/hcd.c:1021 usb_add_hcd+0x914/0xd58 drivers/usb/core/hcd.c:3001 vhci_hcd_probe+0x13c/0x350 drivers/usb/usbip/vhci_hcd.c:1387 platform_probe+0x13c/0x1b4 drivers/base/platform.c:1400 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x39c/0xacc drivers/base/dd.c:639 __driver_probe_device+0x1c8/0x358 drivers/base/dd.c:805 driver_probe_device+0x78/0x324 drivers/base/dd.c:835 __device_attach_driver+0x290/0x4d4 drivers/base/dd.c:963 bus_for_each_drv+0x154/0x1e4 drivers/base/bus.c:429 __device_attach+0x2ac/0x3dc drivers/base/dd.c:1035 device_initial_probe+0x24/0x34 drivers/base/dd.c:1084 bus_probe_device+0xbc/0x1c4 drivers/base/bus.c:489 device_add+0xb04/0xefc drivers/base/core.c:3712 platform_device_add+0x3f8/0x6e8 drivers/base/platform.c:717 vhci_hcd_init+0x37c/0x498 drivers/usb/usbip/vhci_hcd.c:1571 do_one_initcall+0x278/0x9e0 init/main.c:1309 do_initcall_level+0x154/0x214 init/main.c:1382 do_initcalls+0x58/0xac init/main.c:1398 do_basic_setup+0x8c/0xa0 init/main.c:1417 kernel_init_freeable+0x35c/0x4f0 init/main.c:1637 kernel_init+0x24/0x1d8 init/main.c:1525 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:850 The buggy address belongs to the object at ffff0000cb688000 which belongs to the cache kernfs_node_cache of size 168 The buggy address is located 0 bytes inside of 168-byte region [ffff0000cb688000, ffff0000cb6880a8) The buggy address belongs to the physical page: page:000000002201aa78 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10b688 flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000200 0000000000000000 dead000000000122 ffff0000c03dca80 raw: 0000000000000000 0000000000110011 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000cb687f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff0000cb688000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff0000cb688080: 00 00 00 00 00 fc fc fc fc fc fc fc fc 00 00 00 ^ ffff0000cb688100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff0000cb688180: 00 00 fc fc fc fc fc fc fc fc 00 00 00 00 00 00 ================================================================== syz.5.91: attempt to access beyond end of device loop5: rw=0, sector=34359738360, nr_sectors = 8 limit=16 syz.5.91: attempt to access beyond end of device loop5: rw=0, sector=34359738360, nr_sectors = 8 limit=16 syz.5.91: attempt to access beyond end of device loop5: rw=0, sector=34359738360, nr_sectors = 8 limit=16