EXT4-fs warning (device loop3): ext4_group_add:1723: Can't resize non-sparse filesystem further ================================================================== BUG: KASAN: use-after-free in ext4_search_dir+0xf7/0x1b0 fs/ext4/namei.c:1543 Read of size 1 at addr ffff88817bbe766d by task syz.3.9409/16139 CPU: 1 PID: 16139 Comm: syz.3.9409 Not tainted 6.1.84-syzkaller-00005-g96d66062d076 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 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_open fs/namei.c:3461 [inline] open_last_lookups fs/namei.c:3551 [inline] path_openat+0x10fd/0x2d60 fs/namei.c:3781 do_filp_open+0x230/0x480 fs/namei.c:3811 do_sys_openat2+0x13f/0x850 fs/open.c:1341 do_sys_open fs/open.c:1357 [inline] __do_sys_creat fs/open.c:1433 [inline] __se_sys_creat fs/open.c:1427 [inline] __x64_sys_creat+0x11f/0x160 fs/open.c:1427 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7ff73af75bd9 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:00007ff73bcf9048 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007ff73b103f60 RCX: 00007ff73af75bd9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000440 RBP: 00007ff73afe4e60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007ff73b103f60 R15: 00007ffe2d1ef348 The buggy address belongs to the physical page: page:ffffea0005eef9c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x17bbe7 flags: 0x4000000000000000(zone=1) raw: 4000000000000000 ffffea000529c008 ffffea0005eef988 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 11492, tgid 11490 (syz.2.9355), ts 1159038779849, free_ts 1159940746188 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] shmem_alloc_folio mm/shmem.c:1597 [inline] shmem_alloc_and_acct_folio+0x78c/0xa50 mm/shmem.c:1622 shmem_get_folio_gfp+0x12d4/0x24b0 mm/shmem.c:1951 shmem_fault+0x1f7/0x840 mm/shmem.c:2166 __do_fault mm/memory.c:4335 [inline] do_read_fault mm/memory.c:4694 [inline] do_fault+0xdb6/0x1cd0 mm/memory.c:4830 handle_pte_fault mm/memory.c:5127 [inline] __handle_mm_fault mm/memory.c:5269 [inline] handle_mm_fault+0x189f/0x30e0 mm/memory.c:5409 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 ksys_mmap_pgoff+0xed/0x1e0 mm/mmap.c:1521 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:93 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline] __x64_sys_mmap+0x103/0x120 arch/x86/kernel/sys_x86_64.c:86 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81 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] shmem_undo_range+0x5fc/0x1660 mm/shmem.c:951 shmem_truncate_range mm/shmem.c:1067 [inline] shmem_evict_inode+0x25f/0xa30 mm/shmem.c:1176 evict+0x2a3/0x630 fs/inode.c:666 iput_final fs/inode.c:1791 [inline] iput+0x642/0x870 fs/inode.c:1817 dentry_unlink_inode+0x34f/0x440 fs/dcache.c:401 __dentry_kill+0x447/0x650 fs/dcache.c:607 dentry_kill+0xc0/0x2a0 dput+0x40/0x80 fs/dcache.c:914 __fput+0x5f0/0x870 fs/file_table.c:328 ____fput+0x15/0x20 fs/file_table.c:348 task_work_run+0x24d/0x2e0 kernel/task_work.c:179 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xbd5/0x2b80 kernel/exit.c:875 Memory state around the buggy address: ffff88817bbe7500: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88817bbe7580: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff88817bbe7600: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88817bbe7680: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88817bbe7700: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== EXT4-fs error (device loop3): ext4_check_all_de:655: inode #12: block 7: comm syz.3.9409: bad entry in directory: rec_len % 4 != 0 - offset=0, inode=95227824, rec_len=26915, size=108 fake=0