REISERFS (device loop4): using 3.5.x disk format ================================================================== 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+0x575/0x1380 fs/reiserfs/namei.c:165 Read of size 4 at addr ffff888034e9e7d4 by task syz-executor.4/20267 CPU: 1 PID: 20267 Comm: syz-executor.4 Not tainted 6.1.62-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15f/0x4f0 mm/kasan/report.c:395 kasan_report+0x136/0x160 mm/kasan/report.c:495 bin_search_in_dir_item fs/reiserfs/namei.c:40 [inline] search_by_entry_key+0x575/0x1380 fs/reiserfs/namei.c:165 reiserfs_find_entry+0xf47/0x19b0 fs/reiserfs/namei.c:322 reiserfs_lookup+0x1e6/0x4b0 fs/reiserfs/namei.c:368 __lookup_slow+0x27e/0x3d0 fs/namei.c:1686 lookup_one_len+0x187/0x2d0 fs/namei.c:2712 reiserfs_lookup_privroot+0x85/0x1e0 fs/reiserfs/xattr.c:973 reiserfs_fill_super+0x21bd/0x2620 fs/reiserfs/super.c:2174 mount_bdev+0x2c9/0x3f0 fs/super.c:1432 legacy_get_tree+0xeb/0x180 fs/fs_context.c:632 vfs_get_tree+0x88/0x270 fs/super.c:1562 do_new_mount+0x28b/0xae0 fs/namespace.c:3040 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f869a87e1ea 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:00007f869b592ee8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f869b592f80 RCX: 00007f869a87e1ea RDX: 0000000020000040 RSI: 0000000020000080 RDI: 00007f869b592f40 RBP: 0000000020000040 R08: 00007f869b592f80 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000080 R13: 00007f869b592f40 R14: 0000000000001120 R15: 0000000020000000 The buggy address belongs to the physical page: page:ffffea0000d3a780 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x34e9e flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 ffffea0000b4bc88 ffffea0000b66248 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 0x140cca(GFP_HIGHUSER_MOVABLE|__GFP_COMP), pid 20274, tgid 20268 (syz-executor.3), ts 3592881261144, free_ts 3593136021599 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2513 prep_new_page mm/page_alloc.c:2520 [inline] get_page_from_freelist+0x31a1/0x3320 mm/page_alloc.c:4279 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5545 __folio_alloc+0xf/0x30 mm/page_alloc.c:5577 vma_alloc_folio+0x486/0x990 mm/mempolicy.c:2243 shmem_alloc_folio mm/shmem.c:1572 [inline] shmem_alloc_and_acct_folio+0x5a8/0xd50 mm/shmem.c:1596 shmem_get_folio_gfp+0x13f0/0x3470 mm/shmem.c:1924 shmem_get_folio mm/shmem.c:2055 [inline] shmem_write_begin+0x16e/0x4e0 mm/shmem.c:2542 generic_perform_write+0x2fc/0x5e0 mm/filemap.c:3754 __generic_file_write_iter+0x176/0x400 mm/filemap.c:3882 generic_file_write_iter+0xab/0x310 mm/filemap.c:3914 call_write_iter include/linux/fs.h:2205 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x7ae/0xba0 fs/read_write.c:584 ksys_write+0x19c/0x2c0 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1440 [inline] free_pcp_prepare mm/page_alloc.c:1490 [inline] free_unref_page_prepare+0xf63/0x1120 mm/page_alloc.c:3358 free_unref_page_list+0x663/0x900 mm/page_alloc.c:3499 release_pages+0x2836/0x2b40 mm/swap.c:1055 __pagevec_release+0x80/0xf0 mm/swap.c:1075 pagevec_release include/linux/pagevec.h:71 [inline] folio_batch_release include/linux/pagevec.h:135 [inline] shmem_undo_range+0x867/0x2020 mm/shmem.c:946 shmem_truncate_range mm/shmem.c:1045 [inline] shmem_evict_inode+0x265/0xa60 mm/shmem.c:1154 evict+0x2a4/0x620 fs/inode.c:664 __dentry_kill+0x436/0x650 fs/dcache.c:607 dentry_kill+0xbb/0x290 dput+0x21a/0x470 fs/dcache.c:913 __fput+0x5e4/0x890 fs/file_table.c:328 task_work_run+0x246/0x300 kernel/task_work.c:179 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+0xb1/0x140 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline] syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:297 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 Memory state around the buggy address: ffff888034e9e680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888034e9e700: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff888034e9e780: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888034e9e800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888034e9e880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================