================================================================== BUG: KASAN: use-after-free in dx_insert_block fs/ext4/namei.c:1387 [inline] BUG: KASAN: use-after-free in do_split+0x1f31/0x24e0 fs/ext4/namei.c:2080 Read of size 157024 at addr ffff888128652028 by task syz.5.1159/4154 CPU: 1 PID: 4154 Comm: syz.5.1159 Not tainted 5.15.178-syzkaller-1079519-ga8a88afaecee #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1c0 lib/dump_stack.c:106 print_address_description+0x87/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0x179/0x1c0 mm/kasan/report.c:444 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x293/0x2a0 mm/kasan/generic.c:189 memmove+0x2d/0x70 mm/kasan/shadow.c:54 dx_insert_block fs/ext4/namei.c:1387 [inline] do_split+0x1f31/0x24e0 fs/ext4/namei.c:2080 make_indexed_dir+0xeb7/0x15a0 fs/ext4/namei.c:2392 ext4_add_entry+0xde2/0x12b0 fs/ext4/namei.c:2504 __ext4_link+0x4e9/0x790 fs/ext4/namei.c:3536 ext4_link+0x1f3/0x290 fs/ext4/namei.c:3577 vfs_link+0x645/0x7f0 fs/namei.c:4557 do_linkat+0x34d/0x9f0 fs/namei.c:4628 __do_sys_link fs/namei.c:4662 [inline] __se_sys_link fs/namei.c:4660 [inline] __x64_sys_link+0x86/0x90 fs/namei.c:4660 x64_sys_call+0x282/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:87 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f6c461d4169 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:00007f6c45c46038 EFLAGS: 00000246 ORIG_RAX: 0000000000000056 RAX: ffffffffffffffda RBX: 00007f6c463ecfa0 RCX: 00007f6c461d4169 RDX: 0000000000000000 RSI: 0000200000000bc0 RDI: 0000200000001240 RBP: 00007f6c462552a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f6c463ecfa0 R15: 00007ffe9cf37c18 The buggy address belongs to the page: page:ffffea0004a19480 refcount:3 mapcount:1 mapping:ffff88810930bc18 index:0x1 pfn:0x128652 memcg:ffff88810e594000 aops:def_blk_aops ino:700005 flags: 0x400000000032201e(referenced|uptodate|dirty|lru|private|mappedtodisk|unevictable|mlocked|zone=1) raw: 400000000032201e ffffea0004781848 ffffea0004c38908 ffff88810930bc18 raw: 0000000000000001 ffff88810c91f0a8 0000000300000000 ffff88810e594000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Movable, gfp_mask 0x108c48(GFP_NOFS|__GFP_NOFAIL|__GFP_HARDWALL|__GFP_MOVABLE), pid 4154, ts 393199938765, free_ts 392974053332 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2605 prep_new_page+0x1b/0x110 mm/page_alloc.c:2611 get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4485 __alloc_pages+0x27e/0x8f0 mm/page_alloc.c:5780 __alloc_pages_node include/linux/gfp.h:591 [inline] alloc_pages_node include/linux/gfp.h:605 [inline] alloc_pages include/linux/gfp.h:618 [inline] __page_cache_alloc include/linux/pagemap.h:305 [inline] pagecache_get_page+0xb18/0xeb0 mm/filemap.c:1946 find_or_create_page include/linux/pagemap.h:418 [inline] grow_dev_page fs/buffer.c:949 [inline] grow_buffers fs/buffer.c:1014 [inline] __getblk_slow fs/buffer.c:1041 [inline] __getblk_gfp+0x21e/0x7c0 fs/buffer.c:1336 sb_getblk include/linux/buffer_head.h:361 [inline] ext4_getblk+0x259/0x700 fs/ext4/inode.c:877 ext4_bread_batch+0x67/0x4c0 fs/ext4/inode.c:944 __ext4_find_entry+0xfbe/0x1af0 fs/ext4/namei.c:1671 ext4_lookup_entry fs/ext4/namei.c:1774 [inline] ext4_lookup+0x3c6/0xaa0 fs/ext4/namei.c:1842 lookup_open fs/namei.c:3440 [inline] open_last_lookups fs/namei.c:3532 [inline] path_openat+0x1194/0x2f40 fs/namei.c:3739 do_filp_open+0x21c/0x460 fs/namei.c:3769 do_sys_openat2+0x13f/0x820 fs/open.c:1234 do_sys_open fs/open.c:1250 [inline] __do_sys_creat fs/open.c:1326 [inline] __se_sys_creat fs/open.c:1320 [inline] __x64_sys_creat+0x11f/0x160 fs/open.c:1320 x64_sys_call+0x27b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:86 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1472 [inline] free_pcp_prepare mm/page_alloc.c:1544 [inline] free_unref_page_prepare+0x7c8/0x7d0 mm/page_alloc.c:3534 free_unref_page_list+0x14b/0xa60 mm/page_alloc.c:3671 release_pages+0x1310/0x1370 mm/swap.c:1009 __pagevec_release+0x84/0x100 mm/swap.c:1029 pagevec_release include/linux/pagevec.h:81 [inline] shmem_undo_range+0x604/0x1560 mm/shmem.c:965 shmem_truncate_range mm/shmem.c:1064 [inline] shmem_evict_inode+0x215/0x9d0 mm/shmem.c:1146 evict+0x529/0x930 fs/inode.c:647 iput_final fs/inode.c:1769 [inline] iput+0x63b/0x7e0 fs/inode.c:1795 dentry_unlink_inode+0x34e/0x430 fs/dcache.c:380 __dentry_kill+0x447/0x660 fs/dcache.c:586 dentry_kill+0xc0/0x2a0 fs/dcache.c:-1 dput+0x45/0x80 fs/dcache.c:893 __fput+0x59d/0x8c0 fs/file_table.c:319 ____fput+0x15/0x20 fs/file_table.c:339 task_work_run+0x129/0x190 kernel/task_work.c:188 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0xc4/0xe0 kernel/entry/common.c:181 Memory state around the buggy address: ffff888128653f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888128653f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888128654000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888128654080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888128654100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== EXT4-fs error (device loop5): ext4_dx_csum_set:531: inode #2: comm syz.5.1159: dir seems corrupt? Run e2fsck -D.