syz.0.343: attempt to access beyond end of device
loop0: rw=524288, sector=8, nr_sectors = 16 limit=16
==================================================================
BUG: KASAN: slab-out-of-bounds in memcpy_to_page include/linux/highmem.h:403 [inline]
BUG: KASAN: slab-out-of-bounds in z_erofs_transform_plain+0x39c/0x494 fs/erofs/decompressor.c:347
Read of size 4096 at addr ffff0000d5153000 by task syz.0.343/5198

CPU: 1 PID: 5198 Comm: syz.0.343 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/07/2026
Call trace:
 dump_backtrace+0x1c4/0x1f0 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+0xf4/0x15c lib/dump_stack.c:106
 print_address_description+0x88/0x218 mm/kasan/report.c:316
 print_report+0x50/0x68 mm/kasan/report.c:420
 kasan_report+0xa8/0xfc mm/kasan/report.c:524
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x258/0x290 mm/kasan/generic.c:189
 memcpy+0x48/0x90 mm/kasan/shadow.c:65
 memcpy_to_page include/linux/highmem.h:403 [inline]
 z_erofs_transform_plain+0x39c/0x494 fs/erofs/decompressor.c:347
 z_erofs_decompress+0x9c/0xd4 fs/erofs/decompressor.c:435
 z_erofs_decompress_pcluster fs/erofs/zdata.c:1159 [inline]
 z_erofs_decompress_queue+0x103c/0x1bf4 fs/erofs/zdata.c:1240
 z_erofs_runqueue+0x1508/0x16a8 fs/erofs/zdata.c:1603
 z_erofs_read_folio+0x2dc/0x5cc fs/erofs/zdata.c:1693
 filemap_read_folio+0x134/0x384 mm/filemap.c:2490
 filemap_update_page mm/filemap.c:2575 [inline]
 filemap_get_pages mm/filemap.c:2689 [inline]
 filemap_read+0x1290/0x20dc mm/filemap.c:2759
 generic_file_read_iter+0xf8/0x5ac mm/filemap.c:2941
 call_read_iter include/linux/fs.h:2259 [inline]
 new_sync_read fs/read_write.c:389 [inline]
 vfs_read+0x3cc/0x7b8 fs/read_write.c:470
 ksys_read+0x12c/0x228 fs/read_write.c:613
 __do_sys_read fs/read_write.c:623 [inline]
 __se_sys_read fs/read_write.c:621 [inline]
 __arm64_sys_read+0x7c/0x90 fs/read_write.c:621
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 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

Allocated by task 3951:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:53
 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505
 __kasan_slab_alloc+0x70/0x88 mm/kasan/common.c:329
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook+0x74/0x430 mm/slab.h:737
 slab_alloc_node mm/slub.c:3359 [inline]
 slab_alloc mm/slub.c:3367 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3374 [inline]
 kmem_cache_alloc+0x234/0x310 mm/slub.c:3383
 kmem_cache_zalloc include/linux/slab.h:689 [inline]
 lsm_inode_alloc security/security.c:597 [inline]
 security_inode_alloc+0x38/0x11c security/security.c:1041
 inode_init_always+0x6c8/0xb28 fs/inode.c:232
 alloc_inode fs/inode.c:268 [inline]
 iget_locked+0x1f0/0x754 fs/inode.c:1373
 kernfs_get_inode+0x5c/0x5b4 fs/kernfs/inode.c:254
 kernfs_iop_lookup+0x244/0x354 fs/kernfs/dir.c:1189
 __lookup_slow+0x25c/0x38c fs/namei.c:1698
 lookup_slow+0x60/0x84 fs/namei.c:1715
 walk_component+0x278/0x374 fs/namei.c:2006
 lookup_last fs/namei.c:2463 [inline]
 path_lookupat+0x168/0x3f0 fs/namei.c:2487
 filename_lookup+0x1d4/0x490 fs/namei.c:2516
 vfs_statx+0xf8/0x5a0 fs/stat.c:229
 vfs_fstatat fs/stat.c:267 [inline]
 __do_sys_newfstatat fs/stat.c:437 [inline]
 __se_sys_newfstatat fs/stat.c:431 [inline]
 __arm64_sys_newfstatat+0x14c/0x1f4 fs/stat.c:431
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x290 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x13c/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x5c/0x134 arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x128 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 object at ffff0000d5153000
 which belongs to the cache lsm_inode_cache of size 24
The buggy address is located 0 bytes inside of
 24-byte region [ffff0000d5153000, ffff0000d5153018)

The buggy address belongs to the physical page:
page:00000000168a7d0d refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x115153
flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000200 0000000000000000 dead000000000122 ffff0000c03dfe00
raw: 0000000000000000 0000000000660066 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000d5152f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000d5152f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000d5153000: 00 00 00 fc fc 00 00 00 fc fc 00 00 00 fc fc 00
                            ^
 ffff0000d5153080: 00 00 fc fc 00 00 00 fc fc 00 00 00 fc fc 00 00
 ffff0000d5153100: 00 fc fc 00 00 00 fc fc 00 00 00 fc fc 00 00 00
==================================================================
syz.0.343: attempt to access beyond end of device
loop0: rw=0, sector=1056, nr_sectors = 8 limit=16