================================================================== BUG: KASAN: use-after-free in reiserfs_release_objectid+0x521/0x780 fs/reiserfs/objectid.c:165 Read of size 8188 at addr ffff88804bca0050 by task syz.3.393/6331 CPU: 1 PID: 6331 Comm: syz.3.393 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Call Trace: dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0xa8/0x210 mm/kasan/report.c:420 kasan_report+0x10b/0x140 mm/kasan/report.c:524 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x27b/0x290 mm/kasan/generic.c:189 memmove+0x25/0x60 mm/kasan/shadow.c:54 reiserfs_release_objectid+0x521/0x780 fs/reiserfs/objectid.c:165 remove_save_link+0x2b6/0x3c0 fs/reiserfs/super.c:542 reiserfs_evict_inode+0x391/0x490 fs/reiserfs/inode.c:91 evict+0x485/0x870 fs/inode.c:705 __dentry_kill+0x431/0x650 fs/dcache.c:611 dentry_kill+0xb8/0x290 fs/dcache.c:-1 dput+0xfa/0x1d0 fs/dcache.c:918 __fput+0x5e0/0x920 fs/file_table.c:328 task_work_run+0x1ca/0x250 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f710238f749 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:00007ffe6b0118d8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007f71025e7da0 RCX: 00007f710238f749 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007f71025e7da0 R08: 000000000000021c R09: 0000001e6b011bcf R10: 00000000003ffbc0 R11: 0000000000000246 R12: 0000000000036c9f R13: 00007ffe6b0119d0 R14: ffffffffffffffff R15: 00007ffe6b0119f0 The buggy address belongs to the physical page: page:ffffea00012f2800 refcount:2 mapcount:0 mapping:ffff888140885ff8 index:0x10 pfn:0x4bca0 memcg:ffff888052de2000 aops:def_blk_aops ino:700003 flags: 0xfff58000022056(referenced|uptodate|lru|workingset|private|mappedtodisk|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff58000022056 ffffea000145f508 ffffea00010d3f48 ffff888140885ff8 raw: 0000000000000010 ffff888054b27570 00000002ffffffff ffff888052de2000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Movable, gfp_mask 0x148c48(GFP_NOFS|__GFP_NOFAIL|__GFP_COMP|__GFP_HARDWALL|__GFP_MOVABLE), pid 6333, tgid 6331 (syz.3.393), ts 221727616223, free_ts 221584251220 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2532 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x1a26/0x1ac0 mm/page_alloc.c:4328 __alloc_pages+0x1df/0x4e0 mm/page_alloc.c:5614 folio_alloc+0x1c/0x60 mm/mempolicy.c:2292 filemap_alloc_folio+0xdb/0x460 mm/filemap.c:999 __filemap_get_folio+0x697/0xdd0 mm/filemap.c:1993 pagecache_get_page+0x26/0x250 mm/folio-compat.c:110 find_or_create_page include/linux/pagemap.h:646 [inline] grow_dev_page fs/buffer.c:946 [inline] grow_buffers fs/buffer.c:1011 [inline] __getblk_slow fs/buffer.c:1038 [inline] __getblk_gfp+0x2d8/0xb20 fs/buffer.c:1333 __bread_gfp+0x26/0x330 fs/buffer.c:1367 sb_bread include/linux/buffer_head.h:338 [inline] read_super_block+0x91/0x7c0 fs/reiserfs/super.c:1604 reiserfs_fill_super+0x79e/0x2340 fs/reiserfs/super.c:1966 mount_bdev+0x287/0x3c0 fs/super.c:1443 legacy_get_tree+0xe6/0x180 fs/fs_context.c:632 vfs_get_tree+0x88/0x270 fs/super.c:1573 do_new_mount+0x24a/0xa40 fs/namespace.c:3078 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3606 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1459 [inline] free_pcp_prepare mm/page_alloc.c:1509 [inline] free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3384 free_unref_page_list+0xbb/0x8e0 mm/page_alloc.c:3525 release_pages+0x1f92/0x2200 mm/swap.c:1035 tlb_batch_pages_flush mm/mmu_gather.c:59 [inline] tlb_flush_mmu_free mm/mmu_gather.c:254 [inline] tlb_flush_mmu+0xff/0x210 mm/mmu_gather.c:261 tlb_finish_mmu+0xbd/0x1c0 mm/mmu_gather.c:361 exit_mmap+0x343/0x8e0 mm/mmap.c:3262 __mmput+0x118/0x3c0 kernel/fork.c:1200 exit_mm+0x1e6/0x2c0 kernel/exit.c:565 do_exit+0x8c1/0x2400 kernel/exit.c:867 do_group_exit+0x217/0x2d0 kernel/exit.c:1022 __do_sys_exit_group kernel/exit.c:1033 [inline] __se_sys_exit_group kernel/exit.c:1031 [inline] __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1031 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Memory state around the buggy address: ffff88804bca0f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88804bca0f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88804bca1000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88804bca1080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88804bca1100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================