EXT4-fs (loop4): encrypted files will use data=ordered instead of data journaling mode EXT4-fs (loop4): 1 truncate cleaned up EXT4-fs (loop4): mounted filesystem without journal. Quota mode: writeback. ================================================================== BUG: KASAN: use-after-free in ext4_search_dir+0xf7/0x1b0 fs/ext4/namei.c:1544 Read of size 1 at addr ffff8881377e510b by task syz.4.5602/21332 CPU: 0 PID: 21332 Comm: syz.4.5602 Not tainted 6.1.112-syzkaller-00036-g929ff4817a0f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 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:1544 ext4_find_inline_entry+0x4b6/0x5e0 fs/ext4/inline.c:1726 __ext4_find_entry+0x2b0/0x1af0 fs/ext4/namei.c:1617 ext4_lookup_entry fs/ext4/namei.c:1772 [inline] ext4_lookup+0x176/0x740 fs/ext4/namei.c:1840 __lookup_slow+0x2b9/0x3e0 fs/namei.c:1689 lookup_slow+0x5a/0x80 fs/namei.c:1706 walk_component fs/namei.c:1997 [inline] link_path_walk+0x9d3/0xee0 fs/namei.c:2324 path_openat+0x25f/0x2d60 fs/namei.c:3780 do_filp_open+0x230/0x480 fs/namei.c:3811 do_open_execat+0x16a/0xaf0 fs/exec.c:928 bprm_execve+0x443/0x1480 fs/exec.c:1830 do_execveat_common+0x90a/0xab0 fs/exec.c:1960 do_execve fs/exec.c:2034 [inline] __do_sys_execve fs/exec.c:2110 [inline] __se_sys_execve fs/exec.c:2105 [inline] __x64_sys_execve+0x92/0xb0 fs/exec.c:2105 x64_sys_call+0x1c5/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:60 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: 0033:0x7f78e937e919 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:00007f78ea12a038 EFLAGS: 00000246 ORIG_RAX: 000000000000003b RAX: ffffffffffffffda RBX: 00007f78e9535fa0 RCX: 00007f78e937e919 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020001040 RBP: 00007f78e93f197e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f78e9535fa0 R15: 00007ffca81ea538 The buggy address belongs to the physical page: page:ffffea0004ddf940 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x1377e5 flags: 0x4000000000000000(zone=1) raw: 4000000000000000 dead000000000100 dead000000000122 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 21240, tgid 21239 (syz.2.5570), ts 1370326139334, free_ts 1371235379489 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+0x2980/0x2a10 mm/page_alloc.c:4439 __alloc_pages+0x234/0x610 mm/page_alloc.c:5728 __folio_alloc+0x15/0x40 mm/page_alloc.c:5760 __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:4359 [inline] do_read_fault mm/memory.c:4725 [inline] do_fault+0xbc5/0x1f10 mm/memory.c:4861 handle_pte_fault mm/memory.c:5157 [inline] __handle_mm_fault mm/memory.c:5299 [inline] handle_mm_fault+0x189f/0x30e0 mm/memory.c:5439 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:3061 [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 x64_sys_call+0x67/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:10 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:3511 free_unref_page_list+0xf1/0x7b0 mm/page_alloc.c:3659 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+0x529/0x930 fs/inode.c:701 iput_final fs/inode.c:1826 [inline] iput+0x616/0x690 fs/inode.c:1852 dentry_unlink_inode+0x34e/0x430 fs/dcache.c:405 __dentry_kill+0x447/0x650 fs/dcache.c:611 dentry_kill+0xc0/0x2a0 dput+0x40/0x80 fs/dcache.c:918 __fput+0x56c/0x870 fs/file_table.c:328 ____fput+0x15/0x20 fs/file_table.c:348 task_work_run+0x24d/0x2e0 kernel/task_work.c:203 exit_task_work include/linux/task_work.h:39 [inline] do_exit+0xbd5/0x2b80 kernel/exit.c:877 Memory state around the buggy address: ffff8881377e5000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8881377e5080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff8881377e5100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff8881377e5180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8881377e5200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ==================================================================