loop0: detected capacity change from 0 to 8192 REISERFS (device loop0): found reiserfs format "3.5" with non-standard journal REISERFS (device loop0): using ordered data mode reiserfs: using flush barriers REISERFS (device loop0): journal params: device loop0, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30 REISERFS (device loop0): checking transaction log (loop0) REISERFS (device loop0): Using r5 hash to sort names ================================================================== BUG: KASAN: use-after-free in strlen+0x54/0x60 lib/string.c:566 Read of size 1 at addr ffff888066d0c7a3 by task syz-executor.0/4569 CPU: 0 PID: 4569 Comm: syz-executor.0 Not tainted 5.15.178-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 print_address_description+0x63/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0x16b/0x1c0 mm/kasan/report.c:451 strlen+0x54/0x60 lib/string.c:566 set_de_name_and_namelen fs/reiserfs/namei.c:82 [inline] linear_search_in_dir_item fs/reiserfs/namei.c:262 [inline] reiserfs_find_entry+0x97e/0x19b0 fs/reiserfs/namei.c:331 reiserfs_lookup+0x1e6/0x4b0 fs/reiserfs/namei.c:368 __lookup_slow+0x275/0x3d0 fs/namei.c:1663 lookup_one_len+0x187/0x2d0 fs/namei.c:2718 reiserfs_lookup_privroot+0x85/0x1e0 fs/reiserfs/xattr.c:980 reiserfs_fill_super+0x191e/0x2690 fs/reiserfs/super.c:2196 mount_bdev+0x2c9/0x3f0 fs/super.c:1400 legacy_get_tree+0xeb/0x180 fs/fs_context.c:611 vfs_get_tree+0x88/0x270 fs/super.c:1530 do_new_mount+0x2ba/0xb40 fs/namespace.c:3012 do_mount fs/namespace.c:3355 [inline] __do_sys_mount fs/namespace.c:3563 [inline] __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3540 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f4465d7122a Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 09 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f44650f0ee8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f44650f0f80 RCX: 00007f4465d7122a RDX: 00000000200000c0 RSI: 0000000020000040 RDI: 00007f44650f0f40 RBP: 00000000200000c0 R08: 00007f44650f0f80 R09: 0000000000008001 R10: 0000000000008001 R11: 0000000000000246 R12: 0000000020000040 R13: 00007f44650f0f40 R14: 0000000000001122 R15: 0000000020000080 The buggy address belongs to the page: page:ffffea00019b4300 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x66d0c flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 ffffea00019b4348 ffff8880b8e40960 0000000000000000 raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 0, migratetype Movable, gfp_mask 0x8(__GFP_MOVABLE), pid 1, ts 16332501623, free_ts 17398870023 split_map_pages+0x246/0x510 mm/compaction.c:99 isolate_freepages_range+0x47c/0x4e0 mm/compaction.c:749 alloc_contig_range+0xc2b/0xf90 mm/page_alloc.c:9258 __alloc_contig_pages mm/page_alloc.c:9282 [inline] alloc_contig_pages+0x3ea/0x4e0 mm/page_alloc.c:9362 debug_vm_pgtable_alloc_huge_page+0xb9/0x110 mm/debug_vm_pgtable.c:1085 init_args+0xc62/0xf50 mm/debug_vm_pgtable.c:1207 debug_vm_pgtable+0xaa/0x470 mm/debug_vm_pgtable.c:1245 do_one_initcall+0x22b/0x7a0 init/main.c:1302 do_initcall_level+0x157/0x210 init/main.c:1375 do_initcalls+0x49/0x90 init/main.c:1391 kernel_init_freeable+0x425/0x5c0 init/main.c:1615 kernel_init+0x19/0x290 init/main.c:1506 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0xc34/0xcf0 mm/page_alloc.c:3317 free_unref_page+0x95/0x2d0 mm/page_alloc.c:3396 free_contig_range+0x95/0xf0 mm/page_alloc.c:9384 destroy_args+0xfe/0x980 mm/debug_vm_pgtable.c:1018 debug_vm_pgtable+0x40d/0x470 mm/debug_vm_pgtable.c:1331 do_one_initcall+0x22b/0x7a0 init/main.c:1302 do_initcall_level+0x157/0x210 init/main.c:1375 do_initcalls+0x49/0x90 init/main.c:1391 kernel_init_freeable+0x425/0x5c0 init/main.c:1615 kernel_init+0x19/0x290 init/main.c:1506 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Memory state around the buggy address: ffff888066d0c680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888066d0c700: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff888066d0c780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888066d0c800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888066d0c880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff 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