erofs: (device loop9): erofs_find_target_block: corrupted dir block 8200 @ nid 36
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BUG: KASAN: slab-out-of-bounds in z_erofs_transform_plain+0x374/0x480 fs/erofs/decompressor.c:350
Read of size 4095 at addr ffff0000dd89f400 by task syz.9.343/7553

CPU: 1 PID: 7553 Comm: syz.9.343 Not tainted 6.1.142-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call trace:
 dump_backtrace+0x1c8/0x1f4 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+0xf8/0x160 lib/dump_stack.c:106
 print_address_description+0x88/0x220 mm/kasan/report.c:316
 print_report+0x50/0x68 mm/kasan/report.c:427
 kasan_report+0xa8/0x100 mm/kasan/report.c:531
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x260/0x2a0 mm/kasan/generic.c:189
 memcpy+0x48/0x90 mm/kasan/shadow.c:65
 z_erofs_transform_plain+0x374/0x480 fs/erofs/decompressor.c:350
 z_erofs_decompress+0x9c/0xd4 fs/erofs/decompressor.c:439
 z_erofs_decompress_pcluster fs/erofs/zdata.c:1175 [inline]
 z_erofs_decompress_queue+0x1054/0x1d30 fs/erofs/zdata.c:1258
 z_erofs_runqueue+0x14fc/0x1678 fs/erofs/zdata.c:1616
 z_erofs_readahead+0x898/0xc58 fs/erofs/zdata.c:1760
 read_pages+0x158/0x680 mm/readahead.c:161
 page_cache_ra_unbounded+0x498/0x57c mm/readahead.c:270
 do_page_cache_ra mm/readahead.c:300 [inline]
 force_page_cache_ra+0x248/0x2b0 mm/readahead.c:331
 force_page_cache_readahead mm/internal.h:125 [inline]
 generic_fadvise+0x32c/0x57c mm/fadvise.c:107
 vfs_fadvise mm/fadvise.c:185 [inline]
 ksys_fadvise64_64 mm/fadvise.c:199 [inline]
 __do_sys_fadvise64_64 mm/fadvise.c:207 [inline]
 __se_sys_fadvise64_64 mm/fadvise.c:205 [inline]
 __arm64_sys_fadvise64_64+0x12c/0x174 mm/fadvise.c:205
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 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 physical page:
page:00000000aea81728 refcount:3 mapcount:0 mapping:000000002ac63606 index:0x1 pfn:0x11d89f
memcg:ffff0000de1b6000
aops:managed_cache_aops ino:0
flags: 0x5ffc00000002004(uptodate|private|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000002004 0000000000000000 dead000000000122 ffff000100491278
raw: 0000000000000001 ffff0000e02f1000 00000003ffffffff ffff0000de1b6000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000dd89ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000dd8a0000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000dd8a0080: 00 00 00 00 00 fc fc fc fc fc fc fc fc 00 00 00
                                  ^
 ffff0000dd8a0100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000dd8a0180: 00 00 fc fc fc fc fc fc fc fc 00 00 00 00 00 00
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