REISERFS (device loop0): Using r5 hash to sort names ================================================================== BUG: KASAN: use-after-free in bin_search_in_dir_item fs/reiserfs/namei.c:40 [inline] BUG: KASAN: use-after-free in search_by_entry_key+0x579/0x1380 fs/reiserfs/namei.c:165 Read of size 4 at addr ffff888084652004 by task syz-executor.0/803 CPU: 0 PID: 803 Comm: syz-executor.0 Not tainted 6.7.0-rc5-syzkaller-00134-g3f7168591ebf #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0x163/0x540 mm/kasan/report.c:475 kasan_report+0x142/0x170 mm/kasan/report.c:588 bin_search_in_dir_item fs/reiserfs/namei.c:40 [inline] search_by_entry_key+0x579/0x1380 fs/reiserfs/namei.c:165 reiserfs_find_entry+0xf4b/0x19b0 fs/reiserfs/namei.c:322 reiserfs_lookup+0x1e2/0x580 fs/reiserfs/namei.c:368 __lookup_slow+0x282/0x3e0 fs/namei.c:1694 lookup_one_len+0x188/0x2c0 fs/namei.c:2746 reiserfs_lookup_privroot+0x89/0x180 fs/reiserfs/xattr.c:977 reiserfs_fill_super+0x195b/0x2620 fs/reiserfs/super.c:2192 mount_bdev+0x237/0x300 fs/super.c:1650 legacy_get_tree+0xef/0x190 fs/fs_context.c:662 vfs_get_tree+0x8c/0x2a0 fs/super.c:1771 do_new_mount+0x28f/0xae0 fs/namespace.c:3337 do_mount fs/namespace.c:3677 [inline] __do_sys_mount fs/namespace.c:3886 [inline] __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3863 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x45/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7fbaf847e2aa 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:00007fbaf91d4ee8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fbaf91d4f80 RCX: 00007fbaf847e2aa RDX: 0000000020000000 RSI: 0000000020001240 RDI: 00007fbaf91d4f40 RBP: 0000000020000000 R08: 00007fbaf91d4f80 R09: 000000000300408f R10: 000000000300408f R11: 0000000000000202 R12: 0000000020001240 R13: 00007fbaf91d4f40 R14: 0000000000001135 R15: 0000000020000040 The buggy address belongs to the physical page: page:ffffea0002119480 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x84652 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000000 ffffea00021194c8 ffff8880b9842270 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 0x100cca(GFP_HIGHUSER_MOVABLE), pid 508, tgid 506 (syz-executor.0), ts 2721685923813, free_ts 2723389872413 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1544 [inline] get_page_from_freelist+0x33ea/0x3570 mm/page_alloc.c:3312 __alloc_pages+0x255/0x680 mm/page_alloc.c:4568 alloc_pages_mpol+0x3de/0x640 mm/mempolicy.c:2133 shmem_alloc_folio mm/shmem.c:1613 [inline] shmem_alloc_and_add_folio+0x24f/0xde0 mm/shmem.c:1653 shmem_get_folio_gfp+0x7c3/0x1ee0 mm/shmem.c:2037 shmem_get_folio mm/shmem.c:2119 [inline] shmem_write_begin+0x170/0x4c0 mm/shmem.c:2702 generic_perform_write+0x31b/0x630 mm/filemap.c:3918 shmem_file_write_iter+0xfc/0x120 mm/shmem.c:2878 call_write_iter include/linux/fs.h:2020 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x792/0xb20 fs/read_write.c:584 ksys_write+0x1a0/0x2c0 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x45/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1137 [inline] free_unref_page_prepare+0x931/0xa60 mm/page_alloc.c:2347 free_unref_page_list+0x5a0/0x840 mm/page_alloc.c:2533 release_pages+0x2117/0x2400 mm/swap.c:1042 __folio_batch_release+0x84/0x100 mm/swap.c:1062 folio_batch_release include/linux/pagevec.h:83 [inline] shmem_undo_range+0x6aa/0x19d0 mm/shmem.c:1004 shmem_truncate_range mm/shmem.c:1096 [inline] shmem_evict_inode+0x29b/0xa60 mm/shmem.c:1224 evict+0x2a4/0x630 fs/inode.c:666 __dentry_kill+0x436/0x660 fs/dcache.c:607 dentry_kill+0xbb/0x290 dput+0x21e/0x470 fs/dcache.c:913 __fput+0x60b/0xa10 fs/file_table.c:402 task_work_run+0x24a/0x300 kernel/task_work.c:180 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:171 exit_to_user_mode_prepare+0xb1/0x150 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x69/0x2a0 kernel/entry/common.c:296 do_syscall_64+0x52/0x110 arch/x86/entry/common.c:89 Memory state around the buggy address: ffff888084651f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888084651f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888084652000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888084652080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888084652100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================