loop6: rw=524288, sector=88, nr_sectors = 48 limit=16
syz.6.297: attempt to access beyond end of device
loop6: rw=524288, sector=8, nr_sectors = 80 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 ffff0000dbe35000 by task syz.6.297/5436

CPU: 1 PID: 5436 Comm: syz.6.297 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026
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_fault+0x990/0xe98 mm/filemap.c:3340
 __do_fault+0x11c/0x3d8 mm/memory.c:4278
 do_cow_fault mm/memory.c:4659 [inline]
 do_fault mm/memory.c:4760 [inline]
 handle_pte_fault mm/memory.c:5029 [inline]
 __handle_mm_fault mm/memory.c:5171 [inline]
 handle_mm_fault+0x18d8/0x3018 mm/memory.c:5292
 faultin_page mm/gup.c:1026 [inline]
 __get_user_pages+0x340/0x770 mm/gup.c:1250
 populate_vma_page_range+0x1f4/0x298 mm/gup.c:1607
 __mm_populate+0x214/0x338 mm/gup.c:1721
 do_mlock+0x420/0x514 mm/mlock.c:608
 __do_sys_mlock mm/mlock.c:616 [inline]
 __se_sys_mlock mm/mlock.c:614 [inline]
 __arm64_sys_mlock+0x60/0x78 mm/mlock.c:614
 __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 4166:
 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
 prepare_creds+0x44/0x698 kernel/cred.c:260
 __sys_setuid+0x94/0x4e8 kernel/sys.c:615
 __do_sys_setuid kernel/sys.c:652 [inline]
 __se_sys_setuid kernel/sys.c:650 [inline]
 __arm64_sys_setuid+0x3c/0x4c kernel/sys.c:650
 __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 ffff0000dbe35000
 which belongs to the cache cred_jar of size 200
The buggy address is located 0 bytes inside of
 200-byte region [ffff0000dbe35000, ffff0000dbe350c8)

The buggy address belongs to the physical page:
page:000000002f9496fb refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11be35
flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000000200 fffffc00034116c0 dead000000000007 ffff0000c03ded80
raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000dbe34f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000dbe35000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000dbe35080: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
                                              ^
 ffff0000dbe35100: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
 ffff0000dbe35180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
syz.6.297: attempt to access beyond end of device
loop6: rw=0, sector=34359738360, nr_sectors = 8 limit=16
syz.6.297: attempt to access beyond end of device
loop6: rw=0, sector=34359738360, nr_sectors = 8 limit=16
syz.6.297: attempt to access beyond end of device
loop6: rw=0, sector=34359738360, nr_sectors = 8 limit=16
syz.6.297: attempt to access beyond end of device
loop6: rw=0, sector=34359738360, nr_sectors = 8 limit=16