loop1: detected capacity change from 0 to 1024 EXT4-fs: Ignoring removed orlov option EXT4-fs (loop1): mounted filesystem without journal. Quota mode: none. ================================================================== BUG: KASAN: use-after-free in ext4_search_dir+0xf7/0x1b0 fs/ext4/namei.c:1543 Read of size 1 at addr ffff8881139d4900 by task syz.1.78/545 CPU: 0 PID: 545 Comm: syz.1.78 Not tainted 6.1.93-syzkaller-00002-gd02968a02321 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0x158/0x4e0 mm/kasan/report.c:427 kasan_report+0x13c/0x170 mm/kasan/report.c:531 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:348 ext4_search_dir+0xf7/0x1b0 fs/ext4/namei.c:1543 ext4_find_inline_entry+0x4b6/0x5e0 fs/ext4/inline.c:1722 __ext4_find_entry+0x2b0/0x1af0 fs/ext4/namei.c:1616 ext4_lookup_entry fs/ext4/namei.c:1771 [inline] ext4_lookup+0x176/0x740 fs/ext4/namei.c:1839 lookup_one_qstr_excl+0x143/0x290 fs/namei.c:1604 filename_create+0x28e/0x530 fs/namei.c:3878 do_mkdirat+0xbd/0x450 fs/namei.c:4122 __do_sys_mkdirat fs/namei.c:4147 [inline] __se_sys_mkdirat fs/namei.c:4145 [inline] __x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4145 x64_sys_call+0x6c6/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:259 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fb496f7c797 Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 02 01 00 00 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:00007fb497df2e68 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007fb497df2ef0 RCX: 00007fb496f7c797 RDX: 00000000000001ff RSI: 0000000020000080 RDI: 00000000ffffff9c RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000080 R13: 00007fb497df2eb0 R14: 0000000000000000 R15: 0000000000000000 The buggy address belongs to the physical page: page:ffffea00044e7500 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x1139d4 flags: 0x4000000000000000(zone=1) raw: 4000000000000000 ffffea00044e7548 ffffea0004811048 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 0x152c4a(GFP_NOFS|__GFP_HIGHMEM|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL|__GFP_MOVABLE), pid 503, tgid 502 (syz.2.62), ts 25798874854, free_ts 25917650274 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x213/0x220 mm/page_alloc.c:2590 prep_new_page+0x1b/0x110 mm/page_alloc.c:2597 get_page_from_freelist+0x27ea/0x2870 mm/page_alloc.c:4425 __alloc_pages+0x3a1/0x780 mm/page_alloc.c:5714 __folio_alloc+0x15/0x40 mm/page_alloc.c:5746 __folio_alloc_node include/linux/gfp.h:245 [inline] folio_alloc include/linux/gfp.h:274 [inline] filemap_alloc_folio include/linux/pagemap.h:513 [inline] page_cache_ra_unbounded+0x2a4/0x690 mm/readahead.c:259 do_page_cache_ra mm/readahead.c:311 [inline] page_cache_ra_order+0x987/0xc40 mm/readahead.c:575 ondemand_readahead+0x91a/0xee0 mm/readahead.c:699 page_cache_async_ra+0xee/0x120 mm/readahead.c:748 do_async_mmap_readahead mm/filemap.c:3162 [inline] filemap_fault+0x6de/0x11a0 mm/filemap.c:3216 f2fs_filemap_fault+0x7d/0x260 fs/f2fs/file.c:44 __do_fault mm/memory.c:4340 [inline] do_read_fault mm/memory.c:4699 [inline] do_fault+0xc58/0x1bf0 mm/memory.c:4835 handle_pte_fault mm/memory.c:5132 [inline] __handle_mm_fault mm/memory.c:5274 [inline] handle_mm_fault+0x189f/0x30e0 mm/memory.c:5414 faultin_page mm/gup.c:1009 [inline] __get_user_pages+0x377/0xf20 mm/gup.c:1233 populate_vma_page_range mm/gup.c:1590 [inline] __mm_populate+0x375/0x570 mm/gup.c:1704 mm_populate include/linux/mm.h:3052 [inline] vm_mmap_pgoff+0x290/0x430 mm/util.c:530 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1498 [inline] free_pcp_prepare mm/page_alloc.c:1572 [inline] free_unref_page_prepare+0x83d/0x850 mm/page_alloc.c:3498 free_unref_page_list+0xf1/0x7b0 mm/page_alloc.c:3646 release_pages+0xf7f/0xfe0 mm/swap.c:1063 __pagevec_release+0x84/0x100 mm/swap.c:1083 pagevec_release include/linux/pagevec.h:71 [inline] folio_batch_release include/linux/pagevec.h:135 [inline] truncate_inode_pages_range+0x1d1/0x1020 mm/truncate.c:374 truncate_inode_pages mm/truncate.c:456 [inline] truncate_inode_pages_final+0x83/0x90 mm/truncate.c:495 f2fs_evict_inode+0x1cb/0x1480 fs/f2fs/inode.c:753 evict+0x2a3/0x630 fs/inode.c:666 dispose_list fs/inode.c:699 [inline] evict_inodes+0x5d1/0x650 fs/inode.c:749 generic_shutdown_super+0x97/0x370 fs/super.c:482 kill_block_super+0x7e/0xe0 fs/super.c:1461 kill_f2fs_super+0x2f9/0x3c0 fs/f2fs/super.c:4756 deactivate_locked_super+0xad/0x110 fs/super.c:334 deactivate_super+0xbe/0xf0 fs/super.c:365 cleanup_mnt+0x485/0x510 fs/namespace.c:1186 __cleanup_mnt+0x19/0x20 fs/namespace.c:1193 Memory state around the buggy address: ffff8881139d4800: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8881139d4880: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff8881139d4900: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff8881139d4980: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8881139d4a00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== EXT4-fs error (device loop1): ext4_find_dest_de:2112: inode #12: block 7: comm syz.1.78: bad entry in directory: directory entry overrun - offset=0, inode=1793120026, rec_len=34652, size=56 fake=0