================================================================== BUG: KASAN: use-after-free in ext4_read_inline_data fs/ext4/inline.c:210 [inline] BUG: KASAN: use-after-free in ext4_read_inline_dir+0x48c/0xf60 fs/ext4/inline.c:1512 Read of size 68 at addr ffff88813008fd05 by task syz-executor/488 CPU: 1 PID: 488 Comm: syz-executor Not tainted 6.1.129-syzkaller-1168452-g3e6e324f5b47 #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+0x151/0x1b7 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 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x294/0x2a0 mm/kasan/generic.c:189 memcpy+0x2d/0x70 mm/kasan/shadow.c:65 ext4_read_inline_data fs/ext4/inline.c:210 [inline] ext4_read_inline_dir+0x48c/0xf60 fs/ext4/inline.c:1512 ext4_readdir+0x3d1/0x3860 fs/ext4/dir.c:158 iterate_dir+0x265/0x600 fs/readdir.c:-1 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64+0x1c1/0x460 fs/readdir.c:354 __x64_sys_getdents64+0x7b/0x90 fs/readdir.c:354 x64_sys_call+0x5ae/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:218 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: 0033:0x7fe00b3b8693 Code: c1 66 0f 1f 44 00 00 48 83 c4 08 48 89 ef 5b 5d e9 82 3e f8 ff 66 90 b8 ff ff ff 7f 48 39 c2 48 0f 47 d0 b8 d9 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 05 c3 0f 1f 40 00 48 c7 c2 a8 ff ff ff f7 d8 RSP: 002b:00007ffe4e29e588 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 00005555649f7520 RCX: 00007fe00b3b8693 RDX: 0000000000008000 RSI: 00005555649f7520 RDI: 0000000000000006 RBP: 00005555649f74f4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000001000 R11: 0000000000000293 R12: ffffffffffffffa8 R13: 0000000000000016 R14: 00005555649f74f0 R15: 0000000000000001 The buggy address belongs to the physical page: page:ffffea0004c023c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x13008f flags: 0x4000000000000000(zone=1) raw: 4000000000000000 ffffea0004c01c88 ffffea0004c02388 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 0x8140dca(GFP_HIGHUSER_MOVABLE|__GFP_COMP|__GFP_ZERO|__GFP_CMA), pid 493, tgid 492 (syz.3.20), ts 52247620637, free_ts 52283350673 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x213/0x220 mm/page_alloc.c:2637 prep_new_page+0x1b/0x110 mm/page_alloc.c:2644 get_page_from_freelist+0x3a98/0x3b10 mm/page_alloc.c:4539 __alloc_pages+0x234/0x610 mm/page_alloc.c:5837 __folio_alloc+0x15/0x40 mm/page_alloc.c:5869 __folio_alloc_node include/linux/gfp.h:245 [inline] folio_alloc include/linux/gfp.h:274 [inline] alloc_page_vma include/linux/gfp.h:283 [inline] wp_page_copy+0x23b/0x1690 mm/memory.c:3202 do_wp_page+0xc5c/0xf30 mm/memory.c:-1 handle_pte_fault mm/memory.c:5175 [inline] __handle_mm_fault mm/memory.c:5299 [inline] handle_mm_fault+0x15e0/0x30e0 mm/memory.c:5439 do_user_addr_fault arch/x86/mm/fault.c:1323 [inline] handle_page_fault arch/x86/mm/fault.c:1466 [inline] exc_page_fault+0x3b3/0x6d0 arch/x86/mm/fault.c:1522 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:608 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1545 [inline] free_pcp_prepare mm/page_alloc.c:1619 [inline] free_unref_page_prepare+0x9f1/0xa00 mm/page_alloc.c:3581 free_unref_page_list+0xf1/0x7b0 mm/page_alloc.c:3729 release_pages+0xef9/0xf50 mm/swap.c:1043 folios_put include/linux/mm.h:1470 [inline] folio_batch_move_lru+0x3cf/0x4a0 mm/swap.c:245 folio_batch_add_and_move mm/swap.c:255 [inline] folio_add_lru+0x23c/0x3f0 mm/swap.c:526 filemap_add_folio+0x18f/0x200 mm/filemap.c:997 page_cache_ra_unbounded+0x2e9/0x800 mm/readahead.c:263 do_page_cache_ra mm/readahead.c:312 [inline] page_cache_ra_order+0x987/0xc40 mm/readahead.c:576 ondemand_readahead+0x925/0xef0 mm/readahead.c:704 page_cache_async_ra+0xee/0x120 mm/readahead.c:753 do_async_mmap_readahead mm/filemap.c:3191 [inline] filemap_fault+0x6de/0x11a0 mm/filemap.c:3245 __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 Memory state around the buggy address: ffff88813008fc00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88813008fc80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff88813008fd00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff88813008fd80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff88813008fe00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== EXT4-fs error (device loop3): ext4_read_inline_dir:1593: inode #12: block 5: comm syz-executor: path /0/file0/file0: bad entry in directory: rec_len % 4 != 0 - offset=24, inode=1633771873, rec_len=24929, size=148 fake=0 EXT4-fs error (device loop3): ext4_read_inline_dir:1593: inode #12: block 5: comm syz-executor: path /0/file0/file0: bad entry in directory: rec_len % 4 != 0 - offset=24, inode=1633771873, rec_len=24929, size=148 fake=0 EXT4-fs error (device loop3): empty_inline_dir:1877: inode #12: block 5: comm syz-executor: bad entry in directory: rec_len % 4 != 0 - offset=4, inode=1633771873, rec_len=24929, size=60 fake=0 EXT4-fs warning (device loop3): empty_inline_dir:1884: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs error (device loop3): ext4_read_inline_dir:1593: inode #12: block 5: comm syz-executor: path /0/file0/file0: bad entry in directory: rec_len % 4 != 0 - offset=24, inode=1633771873, rec_len=24929, size=148 fake=0 EXT4-fs error (device loop3): ext4_read_inline_dir:1593: inode #12: block 5: comm syz-executor: path /0/file0/file0: bad entry in directory: rec_len % 4 != 0 - offset=24, inode=1633771873, rec_len=24929, size=148 fake=0 EXT4-fs error (device loop3): empty_inline_dir:1877: inode #12: block 5: comm syz-executor: bad entry in directory: rec_len % 4 != 0 - offset=4, inode=1633771873, rec_len=24929, size=60 fake=0 EXT4-fs warning (device loop3): empty_inline_dir:1884: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs error (device loop3): ext4_read_inline_dir:1593: inode #12: block 5: comm syz-executor: path /0/file0/file0: bad entry in directory: rec_len % 4 != 0 - offset=24, inode=1633771873, rec_len=24929, size=148 fake=0 EXT4-fs error (device loop3): ext4_read_inline_dir:1593: inode #12: block 5: comm syz-executor: path /0/file0/file0: bad entry in directory: rec_len % 4 != 0 - offset=24, inode=1633771873, rec_len=24929, size=148 fake=0 EXT4-fs error (device loop3): empty_inline_dir:1877: inode #12: block 5: comm syz-executor: bad entry in directory: rec_len % 4 != 0 - offset=4, inode=1633771873, rec_len=24929, size=60 fake=0 EXT4-fs warning (device loop3): empty_inline_dir:1884: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs warning (device loop3): empty_inline_dir:1884: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs warning (device loop3): empty_inline_dir:1884: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs warning (device loop3): empty_inline_dir:1884: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs warning (device loop3): empty_inline_dir:1884: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs warning (device loop3): empty_inline_dir:1884: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs warning (device loop3): empty_inline_dir:1884: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs warning (device loop3): empty_inline_dir:1884: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs (loop3): unmounting filesystem.