REISERFS (device loop4): Using r5 hash to sort names REISERFS (device loop4): Created .reiserfs_priv - reserved for xattr storage. ================================================================== BUG: KASAN: use-after-free in strlen+0x56/0x60 lib/string.c:495 Read of size 1 at addr ffff88804df9f9cc by task syz-executor.4/6139 CPU: 1 PID: 6139 Comm: syz-executor.4 Not tainted 6.1.0-rc6-syzkaller-00015-gc3eb11fbb826 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106 print_address_description+0x74/0x340 mm/kasan/report.c:284 print_report+0x107/0x1f0 mm/kasan/report.c:395 kasan_report+0xcd/0x100 mm/kasan/report.c:495 strlen+0x56/0x60 lib/string.c:495 _Z16__fortify_strlenPKcU17pass_object_size1 include/linux/fortify-string.h:196 [inline] set_de_name_and_namelen+0x378/0x5c0 fs/reiserfs/namei.c:82 search_by_entry_key+0x6ca/0xd20 fs/reiserfs/namei.c:172 reiserfs_readdir_inode+0x235/0x1410 fs/reiserfs/dir.c:98 iterate_dir+0x257/0x5f0 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64+0x1db/0x4c0 fs/readdir.c:354 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: 0033:0x7f0b9088c0d9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f0b915cf168 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 00007f0b909abf80 RCX: 00007f0b9088c0d9 RDX: 0000000000000018 RSI: 00000000200022c0 RDI: 0000000000000005 RBP: 00007f0b908e7ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc0d1eec1f R14: 00007f0b915cf300 R15: 0000000000022000 The buggy address belongs to the physical page: page:ffffea000137e7c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x4df9f flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 ffffea000107e008 ffffea000137e788 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 6092, tgid 6090 (syz-executor.0), ts 409104343654, free_ts 409969884842 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x742/0x7c0 mm/page_alloc.c:4288 __alloc_pages+0x259/0x560 mm/page_alloc.c:5555 __folio_alloc+0xf/0x30 mm/page_alloc.c:5587 vma_alloc_folio+0x660/0xb60 mm/mempolicy.c:2246 shmem_alloc_folio mm/shmem.c:1561 [inline] shmem_alloc_and_acct_folio+0x59b/0xd80 mm/shmem.c:1585 shmem_get_folio_gfp+0xd00/0x36e0 mm/shmem.c:1913 shmem_get_folio mm/shmem.c:2044 [inline] shmem_write_begin+0x133/0x480 mm/shmem.c:2531 generic_perform_write+0x2e4/0x5e0 mm/filemap.c:3753 __generic_file_write_iter+0x176/0x400 mm/filemap.c:3881 generic_file_write_iter+0xab/0x310 mm/filemap.c:3913 call_write_iter include/linux/fs.h:2191 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x7dc/0xc50 fs/read_write.c:584 ksys_write+0x177/0x2a0 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:1459 [inline] free_pcp_prepare+0x80c/0x8f0 mm/page_alloc.c:1509 free_unref_page_prepare mm/page_alloc.c:3387 [inline] free_unref_page_list+0xb4/0x7b0 mm/page_alloc.c:3529 release_pages+0x232a/0x25c0 mm/swap.c:1055 __pagevec_release+0x7d/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+0x89a/0x2260 mm/shmem.c:946 shmem_truncate_range mm/shmem.c:1034 [inline] shmem_evict_inode+0x27f/0xab0 mm/shmem.c:1143 evict+0x2a4/0x620 fs/inode.c:664 __dentry_kill+0x3b1/0x5b0 fs/dcache.c:607 dentry_kill+0xbb/0x290 dput+0x1f3/0x410 fs/dcache.c:913 __fput+0x5e4/0x880 fs/file_table.c:328 task_work_run+0x243/0x300 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0x124/0x150 kernel/entry/common.c:171 exit_to_user_mode_prepare+0xb2/0x140 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x26/0x60 kernel/entry/common.c:296 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 Memory state around the buggy address: ffff88804df9f880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88804df9f900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff88804df9f980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88804df9fa00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88804df9fa80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================