REISERFS (device loop1): journal params: device loop1, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30 REISERFS (device loop1): checking transaction log (loop1) REISERFS (device loop1): Using r5 hash to sort names ================================================================== BUG: KASAN: use-after-free in strlen+0x7d/0xa0 lib/string.c:418 Read of size 1 at addr ffff88808d8711b3 by task syz-executor.1/25643 CPU: 0 PID: 25643 Comm: syz-executor.1 Not tainted 6.4.0-rc7-syzkaller-00234-g547cc9be86f4 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:351 print_report mm/kasan/report.c:462 [inline] kasan_report+0x11c/0x130 mm/kasan/report.c:572 strlen+0x7d/0xa0 lib/string.c:418 __fortify_strlen include/linux/fortify-string.h:241 [inline] set_de_name_and_namelen+0x4c4/0x6a0 fs/reiserfs/namei.c:82 search_by_entry_key+0x4f3/0x960 fs/reiserfs/namei.c:172 reiserfs_find_entry.part.0+0x139/0xdf0 fs/reiserfs/namei.c:322 reiserfs_find_entry fs/reiserfs/namei.c:368 [inline] reiserfs_lookup+0x24e/0x610 fs/reiserfs/namei.c:368 __lookup_slow+0x24c/0x460 fs/namei.c:1690 lookup_one_len+0x16e/0x1a0 fs/namei.c:2742 reiserfs_lookup_privroot+0x96/0x210 fs/reiserfs/xattr.c:976 reiserfs_fill_super+0x1a8d/0x2eb0 fs/reiserfs/super.c:2192 mount_bdev+0x358/0x420 fs/super.c:1380 legacy_get_tree+0x109/0x220 fs/fs_context.c:610 vfs_get_tree+0x8d/0x350 fs/super.c:1510 do_new_mount fs/namespace.c:3039 [inline] path_mount+0x134b/0x1e40 fs/namespace.c:3369 do_mount fs/namespace.c:3382 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __x64_sys_mount+0x283/0x300 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f2cd7e8d8ba Code: 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2cd8c07f88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000000111c RCX: 00007f2cd7e8d8ba RDX: 0000000020000540 RSI: 0000000020000280 RDI: 00007f2cd8c07fe0 RBP: 00007f2cd8c08020 R08: 00007f2cd8c08020 R09: 000000000120c083 R10: 000000000120c083 R11: 0000000000000202 R12: 0000000020000540 R13: 0000000020000280 R14: 00007f2cd8c07fe0 R15: 0000000020000580 The buggy address belongs to the physical page: page:ffffea0002361c40 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x8d871 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000000 dead000000000100 dead000000000122 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 0x140dca(GFP_HIGHUSER_MOVABLE|__GFP_COMP|__GFP_ZERO), pid 5063, tgid 4989 (syz-fuzzer), ts 363350068038, free_ts 842875300002 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2db/0x350 mm/page_alloc.c:1731 prep_new_page mm/page_alloc.c:1738 [inline] get_page_from_freelist+0xf41/0x2c00 mm/page_alloc.c:3502 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4768 __folio_alloc+0x16/0x40 mm/page_alloc.c:4800 vma_alloc_folio+0x155/0x890 mm/mempolicy.c:2240 do_anonymous_page mm/memory.c:4085 [inline] do_pte_missing mm/memory.c:3645 [inline] handle_pte_fault mm/memory.c:4947 [inline] __handle_mm_fault+0x224c/0x41c0 mm/memory.c:5089 handle_mm_fault+0x2af/0x9f0 mm/memory.c:5243 do_user_addr_fault+0x2ca/0x1210 arch/x86/mm/fault.c:1349 handle_page_fault arch/x86/mm/fault.c:1534 [inline] exc_page_fault+0x98/0x170 arch/x86/mm/fault.c:1590 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1302 [inline] free_unref_page_prepare+0x62e/0xcb0 mm/page_alloc.c:2564 free_unref_page_list+0xe3/0xa70 mm/page_alloc.c:2705 release_pages+0xcd8/0x1380 mm/swap.c:1042 tlb_batch_pages_flush+0xa8/0x1a0 mm/mmu_gather.c:97 tlb_flush_mmu_free mm/mmu_gather.c:292 [inline] tlb_flush_mmu mm/mmu_gather.c:299 [inline] tlb_finish_mmu+0x14b/0x7e0 mm/mmu_gather.c:391 zap_page_range_single+0x347/0x4a0 mm/memory.c:1756 madvise_dontneed_single_vma mm/madvise.c:803 [inline] madvise_dontneed_free mm/madvise.c:884 [inline] madvise_vma_behavior+0x1356/0x20a0 mm/madvise.c:1023 madvise_walk_vmas+0x1c7/0x2b0 mm/madvise.c:1248 do_madvise.part.0+0x274/0x5c0 mm/madvise.c:1428 do_madvise mm/madvise.c:1441 [inline] __do_sys_madvise mm/madvise.c:1441 [inline] __se_sys_madvise mm/madvise.c:1439 [inline] __x64_sys_madvise+0x117/0x150 mm/madvise.c:1439 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff88808d871080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88808d871100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff88808d871180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88808d871200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88808d871280: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================