loop2: rw=524288, sector=88, nr_sectors = 48 limit=16 syz.2.249: attempt to access beyond end of device loop2: rw=524288, sector=8, nr_sectors = 80 limit=16 ================================================================== 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 ffff0000ce7fe000 by task syz.2.249/5039 CPU: 0 PID: 5039 Comm: syz.2.249 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 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_cow_fault mm/memory.c:4659 [inline] do_fault mm/memory.c:4760 [inline] handle_pte_fault mm/memory.c:5029 [inline] __handle_mm_fault mm/memory.c:5171 [inline] handle_mm_fault+0x18b4/0x2fb0 mm/memory.c:5292 faultin_page mm/gup.c:1026 [inline] __get_user_pages+0x33c/0x754 mm/gup.c:1250 populate_vma_page_range+0x1f4/0x298 mm/gup.c:1607 __mm_populate+0x210/0x334 mm/gup.c:1721 mm_populate include/linux/mm.h:2891 [inline] vm_mmap_pgoff+0x1d8/0x294 mm/util.c:525 ksys_mmap_pgoff+0x3b8/0x5a0 mm/mmap.c:1482 __do_sys_mmap arch/arm64/kernel/sys.c:28 [inline] __se_sys_mmap arch/arm64/kernel/sys.c:21 [inline] __arm64_sys_mmap+0xf8/0x110 arch/arm64/kernel/sys.c:21 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Allocated by task 4851: 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 create_files fs/sysfs/group.c:64 [inline] internal_create_group+0x3e0/0xad4 fs/sysfs/group.c:148 internal_create_groups fs/sysfs/group.c:188 [inline] sysfs_create_groups+0x60/0x134 fs/sysfs/group.c:214 device_add_groups drivers/base/core.c:2752 [inline] device_add_attrs+0x178/0x6f4 drivers/base/core.c:2911 device_add+0x5e4/0xefc drivers/base/core.c:3648 netdev_register_kobject+0x164/0x2e0 net/core/net-sysfs.c:2013 register_netdevice+0xf1c/0x1614 net/core/dev.c:10243 veth_newlink+0x490/0xaa0 drivers/net/veth.c:1725 rtnl_newlink_create net/core/rtnetlink.c:3428 [inline] __rtnl_newlink net/core/rtnetlink.c:3648 [inline] rtnl_newlink+0x1050/0x1a54 net/core/rtnetlink.c:3661 rtnetlink_rcv_msg+0x698/0xcdc net/core/rtnetlink.c:6158 netlink_rcv_skb+0x218/0x3e8 net/netlink/af_netlink.c:2511 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6176 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x60c/0x814 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x6f4/0x9c0 net/netlink/af_netlink.c:1872 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] __sys_sendto+0x324/0x440 net/socket.c:2152 __do_sys_sendto net/socket.c:2164 [inline] __se_sys_sendto net/socket.c:2160 [inline] __arm64_sys_sendto+0xd8/0xf8 net/socket.c:2160 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 The buggy address belongs to the object at ffff0000ce7fe000 which belongs to the cache kernfs_node_cache of size 168 The buggy address is located 0 bytes inside of 168-byte region [ffff0000ce7fe000, ffff0000ce7fe0a8) The buggy address belongs to the physical page: page:00000000b0fd2a44 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10e7fe 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: ffff0000ce7fdf80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff0000ce7fe000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff0000ce7fe080: 00 00 00 00 00 fc fc fc fc fc fc fc fc 00 00 00 ^ ffff0000ce7fe100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff0000ce7fe180: 00 00 fc fc fc fc fc fc fc fc 00 00 00 00 00 00 ================================================================== syz.2.249: attempt to access beyond end of device loop2: rw=0, sector=16, nr_sectors = 8 limit=16 syz.2.249: attempt to access beyond end of device loop2: rw=0, sector=16, nr_sectors = 8 limit=16 syz.2.249: attempt to access beyond end of device loop2: rw=0, sector=16, nr_sectors = 8 limit=16 syz.2.249: attempt to access beyond end of device loop2: rw=0, sector=16, nr_sectors = 8 limit=16 syz.2.249: attempt to access beyond end of device loop2: rw=0, sector=16, nr_sectors = 8 limit=16 syz.2.249: attempt to access beyond end of device loop2: rw=0, sector=16, nr_sectors = 8 limit=16 syz.2.249: attempt to access beyond end of device loop2: rw=0, sector=16, nr_sectors = 8 limit=16