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BUG: KASAN: slab-out-of-bounds in hfs_asc2mac+0x62a/0x680 fs/hfs/trans.c:133
Write of size 1 at addr ffff8880aaeac24e by task syz-executor419/7945

CPU: 1 PID: 7945 Comm: syz-executor419 Not tainted 4.14.300-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252
 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351
 kasan_report mm/kasan/report.c:409 [inline]
 __asan_report_store1_noabort+0x68/0x70 mm/kasan/report.c:432
 hfs_asc2mac+0x62a/0x680 fs/hfs/trans.c:133
 hfs_cat_build_key+0xbe/0x1a0 fs/hfs/catalog.c:28
 hfs_lookup+0x18c/0x2b0 fs/hfs/dir.c:31
 lookup_open+0x5c4/0x1750 fs/namei.c:3220
 do_last fs/namei.c:3334 [inline]
 path_openat+0xe08/0x2970 fs/namei.c:3571
 do_filp_open+0x179/0x3c0 fs/namei.c:3605
 do_sys_open+0x296/0x410 fs/open.c:1081
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3

Allocated by task 7945:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551
 __do_kmalloc mm/slab.c:3720 [inline]
 __kmalloc+0x15a/0x400 mm/slab.c:3729
 kmalloc include/linux/slab.h:493 [inline]
 hfs_find_init+0x91/0x220 fs/hfs/bfind.c:21
 hfs_lookup+0xea/0x2b0 fs/hfs/dir.c:28
 lookup_open+0x5c4/0x1750 fs/namei.c:3220
 do_last fs/namei.c:3334 [inline]
 path_openat+0xe08/0x2970 fs/namei.c:3571
 do_filp_open+0x179/0x3c0 fs/namei.c:3605
 do_sys_open+0x296/0x410 fs/open.c:1081
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff8880aaeac200
 which belongs to the cache kmalloc-96 of size 96
The buggy address is located 78 bytes inside of
 96-byte region [ffff8880aaeac200, ffff8880aaeac260)
The buggy address belongs to the page:
page:ffffea0002abab00 count:1 mapcount:0 mapping:ffff8880aaeac000 index:0x0
flags: 0xfff00000000100(slab)
raw: 00fff00000000100 ffff8880aaeac000 0000000000000000 0000000100000020
raw: ffffea0002cc20e0 ffff88813fe64448 ffff88813fe744c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880aaeac100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880aaeac180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880aaeac200: 00 00 00 00 00 00 00 00 00 06 fc fc fc fc fc fc
                                              ^
 ffff8880aaeac280: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
 ffff8880aaeac300: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
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