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BUG: KASAN: slab-out-of-bounds in memcpy_from_page include/linux/highmem.h:423 [inline]
BUG: KASAN: slab-out-of-bounds in hfs_bnode_read+0x120/0x290 fs/hfs/bnode.c:35
Write of size 94 at addr ffff0000cf3d8900 by task syz.1.105/7093

CPU: 0 UID: 0 PID: 7093 Comm: syz.1.105 Not tainted 6.15.0-rc2-syzkaller-gc72692105976 #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 print_address_description+0xa8/0x254 mm/kasan/report.c:408
 print_report+0x68/0x84 mm/kasan/report.c:521
 kasan_report+0xb0/0x110 mm/kasan/report.c:634
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x264/0x2a4 mm/kasan/generic.c:189
 __asan_memcpy+0x54/0x84 mm/kasan/shadow.c:106
 memcpy_from_page include/linux/highmem.h:423 [inline]
 hfs_bnode_read+0x120/0x290 fs/hfs/bnode.c:35
 hfs_bnode_read_key+0x13c/0x1ec fs/hfs/bnode.c:70
 hfs_brec_insert+0x650/0x96c fs/hfs/brec.c:159
 hfs_cat_create+0x2d0/0x590 fs/hfs/catalog.c:118
 hfs_mkdir+0x6c/0xe4 fs/hfs/dir.c:232
 vfs_mkdir+0x284/0x424 fs/namei.c:4324
 do_mkdirat+0x1f8/0x4c8 fs/namei.c:4357
 __do_sys_mkdirat fs/namei.c:4374 [inline]
 __se_sys_mkdirat fs/namei.c:4372 [inline]
 __arm64_sys_mkdirat+0x8c/0xa4 fs/namei.c:4372
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:762
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600

Allocated by task 7093:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x40/0x78 mm/kasan/common.c:68
 kasan_save_alloc_info+0x44/0x54 mm/kasan/generic.c:562
 poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
 __kasan_kmalloc+0x9c/0xb4 mm/kasan/common.c:394
 kasan_kmalloc include/linux/kasan.h:260 [inline]
 __do_kmalloc_node mm/slub.c:4331 [inline]
 __kmalloc_noprof+0x2fc/0x4c8 mm/slub.c:4343
 kmalloc_noprof include/linux/slab.h:909 [inline]
 hfs_find_init+0x88/0x1c8 fs/hfs/bfind.c:21
 hfs_cat_create+0x160/0x590 fs/hfs/catalog.c:96
 hfs_mkdir+0x6c/0xe4 fs/hfs/dir.c:232
 vfs_mkdir+0x284/0x424 fs/namei.c:4324
 do_mkdirat+0x1f8/0x4c8 fs/namei.c:4357
 __do_sys_mkdirat fs/namei.c:4374 [inline]
 __se_sys_mkdirat fs/namei.c:4372 [inline]
 __arm64_sys_mkdirat+0x8c/0xa4 fs/namei.c:4372
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:744
 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:762
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600

The buggy address belongs to the object at ffff0000cf3d8900
 which belongs to the cache kmalloc-96 of size 96
The buggy address is located 0 bytes inside of
 allocated 78-byte region [ffff0000cf3d8900, ffff0000cf3d894e)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10f3d8
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 05ffc00000000000 ffff0000c0001280 dead000000000100 dead000000000122
raw: 0000000000000000 0000000080200020 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000cf3d8800: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
 ffff0000cf3d8880: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
>ffff0000cf3d8900: 00 00 00 00 00 00 00 00 00 06 fc fc fc fc fc fc
                                              ^
 ffff0000cf3d8980: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
 ffff0000cf3d8a00: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
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