syz.1.3755: attempt to access beyond end of device
loop1: rw=524288, sector=8, nr_sectors = 16 limit=16
syz.1.3755: attempt to access beyond end of device
loop1: rw=524288, sector=16, nr_sectors = 40 limit=16
==================================================================
BUG: KASAN: slab-out-of-bounds in memcpy_to_page include/linux/highmem.h:427 [inline]
BUG: KASAN: slab-out-of-bounds in z_erofs_transform_plain+0x3ab/0x4a0 fs/erofs/decompressor.c:347
Read of size 4096 at addr ffff88801cbe2000 by task syz.1.3755/14072

CPU: 1 PID: 14072 Comm: syz.1.3755 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0xa8/0x210 mm/kasan/report.c:468
 kasan_report+0x117/0x150 mm/kasan/report.c:581
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x241/0x290 mm/kasan/generic.c:187
 __asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105
 memcpy_to_page include/linux/highmem.h:427 [inline]
 z_erofs_transform_plain+0x3ab/0x4a0 fs/erofs/decompressor.c:347
 z_erofs_decompress_pcluster fs/erofs/zdata.c:1296 [inline]
 z_erofs_decompress_queue+0x1705/0x2670 fs/erofs/zdata.c:1377
 z_erofs_runqueue+0x1993/0x1b20 fs/erofs/zdata.c:1778
 z_erofs_read_folio+0x321/0x5c0 fs/erofs/zdata.c:1863
 filemap_read_folio+0x16b/0x790 mm/filemap.c:2420
 filemap_update_page mm/filemap.c:2504 [inline]
 filemap_get_pages+0x13ac/0x1f10 mm/filemap.c:2618
 filemap_read+0x409/0xf20 mm/filemap.c:2690
 __kernel_read+0x2e5/0x730 fs/read_write.c:428
 integrity_kernel_read+0x8a/0xd0 security/integrity/iint.c:221
 ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:485 [inline]
 ima_calc_file_shash security/integrity/ima/ima_crypto.c:516 [inline]
 ima_calc_file_hash+0xb1f/0x1960 security/integrity/ima/ima_crypto.c:573
 ima_collect_measurement+0x4d4/0xa30 security/integrity/ima/ima_api.c:290
 process_measurement+0x123a/0x1d50 security/integrity/ima/ima_main.c:370
 ima_file_check+0xcc/0x110 security/integrity/ima/ima_main.c:568
 do_open fs/namei.c:3642 [inline]
 path_openat+0x2910/0x3270 fs/namei.c:3797
 do_filp_open+0x1f2/0x430 fs/namei.c:3824
 do_sys_openat2+0x134/0x1d0 fs/open.c:1422
 do_sys_open fs/open.c:1437 [inline]
 __do_sys_openat fs/open.c:1453 [inline]
 __se_sys_openat fs/open.c:1448 [inline]
 __x64_sys_openat+0x139/0x160 fs/open.c:1448
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fba1eb9de59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fba1fb37028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fba1ee25fa0 RCX: 00007fba1eb9de59
RDX: 00000000000c8000 RSI: 0000200000000100 RDI: ffffffffffffff9c
RBP: 00007fba1ec33e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fba1ee26038 R14: 00007fba1ee25fa0 R15: 00007fffb98b14b8
 </TASK>

Allocated by task 5525:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:188 [inline]
 slab_post_alloc_hook+0x6a/0x4d0 mm/slab.h:767
 slab_alloc_node mm/slub.c:3495 [inline]
 slab_alloc mm/slub.c:3503 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3510 [inline]
 kmem_cache_alloc+0x17e/0x2c0 mm/slub.c:3519
 anon_vma_alloc mm/rmap.c:94 [inline]
 anon_vma_fork+0xe5/0x520 mm/rmap.c:361
 dup_mmap kernel/fork.c:734 [inline]
 dup_mm kernel/fork.c:1694 [inline]
 copy_mm+0x12c7/0x1e30 kernel/fork.c:1743
 copy_process+0x171d/0x3df0 kernel/fork.c:2508
 kernel_clone+0x24b/0x8a0 kernel/fork.c:2917
 __do_sys_clone kernel/fork.c:3060 [inline]
 __se_sys_clone kernel/fork.c:3044 [inline]
 __x64_sys_clone+0x1b7/0x230 kernel/fork.c:3044
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

The buggy address belongs to the object at ffff88801cbe2000
 which belongs to the cache anon_vma of size 208
The buggy address is located 0 bytes inside of
 allocated 208-byte region [ffff88801cbe2000, ffff88801cbe20d0)

The buggy address belongs to the physical page:
page:ffffea000072f880 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1cbe2
memcg:ffff88802462a001
anon flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000800 ffff888019e5b140 0000000000000000 dead000000000001
raw: 0000000000000000 00000000000f000f 00000001ffffffff ffff88802462a001
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 5520, tgid 5520 (dhcpcd-run-hook), ts 55365761969, free_ts 54614457222
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1582
 prep_new_page mm/page_alloc.c:1589 [inline]
 get_page_from_freelist+0x2181/0x22a0 mm/page_alloc.c:3221
 __alloc_pages+0x1f0/0x460 mm/page_alloc.c:4501
 alloc_slab_page+0x5d/0x180 mm/slub.c:1881
 allocate_slab mm/slub.c:2028 [inline]
 new_slab+0x87/0x2d0 mm/slub.c:2081
 ___slab_alloc+0xc5c/0x12f0 mm/slub.c:3253
 __slab_alloc mm/slub.c:3339 [inline]
 __slab_alloc_node mm/slub.c:3392 [inline]
 slab_alloc_node mm/slub.c:3485 [inline]
 slab_alloc mm/slub.c:3503 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3510 [inline]
 kmem_cache_alloc+0x109/0x2c0 mm/slub.c:3519
 anon_vma_alloc mm/rmap.c:94 [inline]
 anon_vma_fork+0xe5/0x520 mm/rmap.c:361
 dup_mmap kernel/fork.c:734 [inline]
 dup_mm kernel/fork.c:1694 [inline]
 copy_mm+0x12c7/0x1e30 kernel/fork.c:1743
 copy_process+0x171d/0x3df0 kernel/fork.c:2508
 kernel_clone+0x24b/0x8a0 kernel/fork.c:2917
 __do_sys_clone kernel/fork.c:3060 [inline]
 __se_sys_clone kernel/fork.c:3044 [inline]
 __x64_sys_clone+0x1b7/0x230 kernel/fork.c:3044
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1182 [inline]
 free_unref_page_prepare+0x7d7/0x8f0 mm/page_alloc.c:2366
 free_unref_page_list+0xbe/0x860 mm/page_alloc.c:2505
 release_pages+0x208a/0x2300 mm/swap.c:1022
 tlb_batch_pages_flush mm/mmu_gather.c:99 [inline]
 tlb_flush_mmu_free mm/mmu_gather.c:294 [inline]
 tlb_flush_mmu+0x379/0x510 mm/mmu_gather.c:301
 tlb_finish_mmu+0xf4/0x220 mm/mmu_gather.c:425
 exit_mmap+0x428/0xb90 mm/mmap.c:3315
 __mmput+0x118/0x3a0 kernel/fork.c:1357
 exit_mm+0x23f/0x340 kernel/exit.c:570
 do_exit+0x909/0x2530 kernel/exit.c:871
 do_group_exit+0x22d/0x2f0 kernel/exit.c:1026
 __do_sys_exit_group kernel/exit.c:1037 [inline]
 __se_sys_exit_group kernel/exit.c:1035 [inline]
 __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1035
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Memory state around the buggy address:
 ffff88801cbe1f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88801cbe2000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88801cbe2080: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
                                                 ^
 ffff88801cbe2100: fc fc 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88801cbe2180: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
==================================================================