loop0: detected capacity change from 0 to 64 ================================================================== BUG: KASAN: slab-out-of-bounds in memcpy_from_page include/linux/highmem.h:423 [inline] BUG: KASAN: slab-out-of-bounds in hfs_bnode_read+0x16a/0x200 fs/hfs/bnode.c:35 Write of size 94 at addr ffff88803340ba00 by task syz.0.98/6720 CPU: 1 UID: 0 PID: 6720 Comm: syz.0.98 Not tainted 6.14.0-syzkaller-03576-g1e1ba8d23dae #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0x16e/0x5b0 mm/kasan/report.c:521 kasan_report+0x143/0x180 mm/kasan/report.c:634 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x28f/0x2a0 mm/kasan/generic.c:189 __asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106 memcpy_from_page include/linux/highmem.h:423 [inline] hfs_bnode_read+0x16a/0x200 fs/hfs/bnode.c:35 hfs_bnode_read_key+0x174/0x240 fs/hfs/bnode.c:70 hfs_brec_insert+0x7f7/0xbe0 fs/hfs/brec.c:159 hfs_cat_create+0x3de/0x760 fs/hfs/catalog.c:118 hfs_create+0x66/0xe0 fs/hfs/dir.c:202 lookup_open fs/namei.c:3666 [inline] open_last_lookups fs/namei.c:3765 [inline] path_openat+0x194b/0x35d0 fs/namei.c:4001 do_filp_open+0x284/0x4e0 fs/namei.c:4031 do_sys_openat2+0x12b/0x1d0 fs/open.c:1429 do_sys_open fs/open.c:1444 [inline] __do_sys_creat fs/open.c:1522 [inline] __se_sys_creat fs/open.c:1516 [inline] __x64_sys_creat+0x124/0x170 fs/open.c:1516 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7b1e18d169 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f7b1ef88038 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007f7b1e3a5fa0 RCX: 00007f7b1e18d169 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 0000200000000e00 RBP: 00007f7b1e20e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f7b1e3a5fa0 R15: 00007fff5481e1d8 Allocated by task 6720: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0x9d/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4318 [inline] __kmalloc_noprof+0x28e/0x4d0 mm/slub.c:4330 kmalloc_noprof include/linux/slab.h:906 [inline] hfs_find_init+0x92/0x1f0 fs/hfs/bfind.c:21 hfs_cat_create+0x181/0x760 fs/hfs/catalog.c:96 hfs_create+0x66/0xe0 fs/hfs/dir.c:202 lookup_open fs/namei.c:3666 [inline] open_last_lookups fs/namei.c:3765 [inline] path_openat+0x194b/0x35d0 fs/namei.c:4001 do_filp_open+0x284/0x4e0 fs/namei.c:4031 do_sys_openat2+0x12b/0x1d0 fs/open.c:1429 do_sys_open fs/open.c:1444 [inline] __do_sys_creat fs/open.c:1522 [inline] __se_sys_creat fs/open.c:1516 [inline] __x64_sys_creat+0x124/0x170 fs/open.c:1516 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88803340ba00 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 0 bytes inside of allocated 78-byte region [ffff88803340ba00, ffff88803340ba4e) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3340b ksm flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000000 ffff88801ac41280 ffffea0000c6c440 dead000000000003 raw: 0000000000000000 0000000080200020 00000000f5000000 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52c40(GFP_NOFS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5193, tgid 5193 (udevd), ts 15563062364, free_ts 11035782441 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1551 prep_new_page mm/page_alloc.c:1559 [inline] get_page_from_freelist+0x368a/0x37d0 mm/page_alloc.c:3477 __alloc_frozen_pages_noprof+0x2c5/0x7b0 mm/page_alloc.c:4740 alloc_pages_mpol+0x339/0x690 mm/mempolicy.c:2301 alloc_slab_page mm/slub.c:2446 [inline] allocate_slab+0x8f/0x3a0 mm/slub.c:2610 new_slab mm/slub.c:2663 [inline] ___slab_alloc+0xc3b/0x1500 mm/slub.c:3849 __slab_alloc+0x58/0xa0 mm/slub.c:3939 __slab_alloc_node mm/slub.c:4014 [inline] slab_alloc_node mm/slub.c:4175 [inline] __do_kmalloc_node mm/slub.c:4317 [inline] __kmalloc_noprof+0x2ea/0x4d0 mm/slub.c:4330 kmalloc_noprof include/linux/slab.h:906 [inline] kmalloc_array_noprof include/linux/slab.h:945 [inline] ext4_find_extent+0x22f/0xd80 fs/ext4/extents.c:916 ext4_ext_map_blocks+0x2e6/0x7d80 fs/ext4/extents.c:4205 ext4_map_query_blocks+0x97/0x2c0 fs/ext4/inode.c:468 ext4_map_blocks+0x3e2/0x1a70 fs/ext4/inode.c:666 ext4_mpage_readpages+0xae4/0x1e00 fs/ext4/readpage.c:289 read_pages+0x193/0x590 mm/readahead.c:160 page_cache_ra_unbounded+0x708/0x820 mm/readahead.c:297 filemap_get_pages+0x59f/0x1fc0 mm/filemap.c:2590 page last free pid 975 tgid 975 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1127 [inline] free_frozen_pages+0xe0d/0x10e0 mm/page_alloc.c:2660 vfree+0x1c3/0x360 mm/vmalloc.c:3383 delayed_vfree_work+0x56/0x80 mm/vmalloc.c:3303 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xac3/0x18e0 kernel/workqueue.c:3319 worker_thread+0x870/0xd30 kernel/workqueue.c:3400 kthread+0x7a9/0x920 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff88803340b900: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc ffff88803340b980: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff88803340ba00: 00 00 00 00 00 00 00 00 00 06 fc fc fc fc fc fc ^ ffff88803340ba80: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc ffff88803340bb00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ==================================================================