syzbot

loop0: detected capacity change from 0 to 1024
==================================================================
BUG: KASAN: slab-out-of-bounds in hfsplus_uni2asc+0x624/0x1018 fs/hfsplus/unicode.c:179
Read of size 2 at addr ffff0000d08dfa18 by task syz-executor995/6237

CPU: 1 PID: 6237 Comm: syz-executor995 Not tainted 6.9.0-rc7-syzkaller-gfda5695d692c #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call trace:
 dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:317
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:324
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:114
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x198/0x538 mm/kasan/report.c:488
 kasan_report+0xd8/0x138 mm/kasan/report.c:601
 __asan_report_load2_noabort+0x20/0x2c mm/kasan/report_generic.c:379
 hfsplus_uni2asc+0x624/0x1018 fs/hfsplus/unicode.c:179
 hfsplus_listxattr+0x5bc/0xc9c fs/hfsplus/xattr.c:736
 vfs_listxattr fs/xattr.c:493 [inline]
 listxattr+0x108/0x368 fs/xattr.c:840
 path_listxattr fs/xattr.c:864 [inline]
 __do_sys_llistxattr fs/xattr.c:882 [inline]
 __se_sys_llistxattr fs/xattr.c:879 [inline]
 __arm64_sys_llistxattr+0x13c/0x21c fs/xattr.c:879
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598

Allocated by task 6237:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x40/0x78 mm/kasan/common.c:68
 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:565
 poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
 __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:387
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slub.c:3966 [inline]
 __kmalloc+0x2b8/0x508 mm/slub.c:3979
 kmalloc include/linux/slab.h:632 [inline]
 hfsplus_find_init+0x84/0x1bc fs/hfsplus/bfind.c:21
 hfsplus_listxattr+0x31c/0xc9c fs/hfsplus/xattr.c:695
 vfs_listxattr fs/xattr.c:493 [inline]
 listxattr+0x108/0x368 fs/xattr.c:840
 path_listxattr fs/xattr.c:864 [inline]
 __do_sys_llistxattr fs/xattr.c:882 [inline]
 __se_sys_llistxattr fs/xattr.c:879 [inline]
 __arm64_sys_llistxattr+0x13c/0x21c fs/xattr.c:879
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598

The buggy address belongs to the object at ffff0000d08df800
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 0 bytes to the right of
 allocated 536-byte region [ffff0000d08df800, ffff0000d08dfa18)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1108d8
head: order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x5ffc00000000840(slab|head|node=0|zone=2|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 05ffc00000000840 ffff0000c0001dc0 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
head: 05ffc00000000840 ffff0000c0001dc0 dead000000000122 0000000000000000
head: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
head: 05ffc00000000003 fffffdffc3423601 dead000000000122 00000000ffffffff
head: 0000000800000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000d08df900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000d08df980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000d08dfa00: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc
                            ^
 ffff0000d08dfa80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000d08dfb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
hfsplus: unicode conversion failed