================================================================== BUG: KASAN: use-after-free in ext4_read_inline_data fs/ext4/inline.c:209 [inline] BUG: KASAN: use-after-free in ext4_read_inline_dir+0x435/0xd90 fs/ext4/inline.c:1523 Read of size 68 at addr ffff8881246c1d05 by task syz-executor/474 CPU: 0 PID: 474 Comm: syz-executor Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2025 Call Trace: __dump_stack+0x21/0x24 lib/dump_stack.c:77 dump_stack_lvl+0x169/0x1d8 lib/dump_stack.c:118 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0xe2/0x130 mm/kasan/report.c:452 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x280/0x290 mm/kasan/generic.c:189 memcpy+0x2d/0x70 mm/kasan/shadow.c:65 ext4_read_inline_data fs/ext4/inline.c:209 [inline] ext4_read_inline_dir+0x435/0xd90 fs/ext4/inline.c:1523 ext4_readdir+0x380/0x39b0 fs/ext4/dir.c:161 iterate_dir+0x260/0x570 fs/readdir.c:-1 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64+0xe5/0x240 fs/readdir.c:354 __x64_sys_getdents64+0x7b/0x90 fs/readdir.c:354 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f1bca80e193 Code: c1 66 0f 1f 44 00 00 48 83 c4 08 48 89 ef 5b 5d e9 42 43 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:00007fff6dbdb558 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 0000555580a01520 RCX: 00007f1bca80e193 RDX: 0000000000008000 RSI: 0000555580a01520 RDI: 0000000000000006 RBP: 0000555580a014f4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000001000 R11: 0000000000000293 R12: ffffffffffffffa8 R13: 0000000000000016 R14: 0000555580a014f0 R15: 00007fff6dbde8f0 The buggy address belongs to the page: page:ffffea000491b040 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x1246c1 flags: 0x4000000000000000() raw: 4000000000000000 ffffea000491b088 ffffea000491b008 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 0x100cca(GFP_HIGHUSER_MOVABLE), pid 467, ts 48742389497, free_ts 49500435793 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x179/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x2235/0x23d0 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x268/0x5f0 mm/page_alloc.c:5370 __alloc_pages include/linux/gfp.h:544 [inline] __alloc_pages_node include/linux/gfp.h:557 [inline] alloc_pages_node include/linux/gfp.h:571 [inline] alloc_pages include/linux/gfp.h:590 [inline] shmem_alloc_page+0x1b1/0x300 mm/shmem.c:1584 shmem_alloc_and_acct_page+0x36f/0x7b0 mm/shmem.c:1609 shmem_getpage_gfp+0x625/0x2110 mm/shmem.c:1922 shmem_getpage mm/shmem.c:165 [inline] shmem_write_begin+0xce/0x1b0 mm/shmem.c:2501 generic_perform_write+0x2be/0x510 mm/filemap.c:3509 __generic_file_write_iter+0x24b/0x480 mm/filemap.c:3638 generic_file_write_iter+0xa9/0x1d0 mm/filemap.c:3670 call_write_iter include/linux/fs.h:2066 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x725/0xd60 fs/read_write.c:605 ksys_write+0x140/0x240 fs/read_write.c:658 __do_sys_write fs/read_write.c:670 [inline] __se_sys_write fs/read_write.c:667 [inline] __x64_sys_write+0x7b/0x90 fs/read_write.c:667 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1349 [inline] free_pcp_prepare mm/page_alloc.c:1421 [inline] free_unref_page_prepare+0x2b7/0x2d0 mm/page_alloc.c:3336 free_unref_page_list+0x12e/0x9b0 mm/page_alloc.c:3443 release_pages+0xe38/0xe80 mm/swap.c:1103 __pagevec_release+0x71/0xe0 mm/swap.c:1123 pagevec_release include/linux/pagevec.h:88 [inline] shmem_undo_range+0x6e1/0x1760 mm/shmem.c:969 shmem_truncate_range mm/shmem.c:1073 [inline] shmem_evict_inode+0x1fd/0x9c0 mm/shmem.c:1173 evict+0x478/0x910 fs/inode.c:612 iput_final fs/inode.c:1736 [inline] iput+0x638/0x7c0 fs/inode.c:1762 dentry_unlink_inode+0x2cf/0x380 fs/dcache.c:378 __dentry_kill+0x44f/0x650 fs/dcache.c:583 dentry_kill+0xc0/0x2a0 fs/dcache.c:-1 dput+0x42/0x80 fs/dcache.c:883 __fput+0x4fe/0x770 fs/file_table.c:294 ____fput+0x15/0x20 fs/file_table.c:314 task_work_run+0x127/0x190 kernel/task_work.c:189 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0xa4f/0x2480 kernel/exit.c:872 Memory state around the buggy address: ffff8881246c1c00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8881246c1c80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff8881246c1d00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff8881246c1d80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff8881246c1e00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== EXT4-fs error (device loop0): ext4_read_inline_dir:1604: 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 loop0): ext4_read_inline_dir:1604: 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 loop0): empty_inline_dir:1858: 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 loop0): empty_inline_dir:1865: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs error (device loop0): ext4_read_inline_dir:1604: 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 loop0): ext4_read_inline_dir:1604: 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 loop0): empty_inline_dir:1858: 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 loop0): empty_inline_dir:1865: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs error (device loop0): ext4_read_inline_dir:1604: 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 loop0): ext4_read_inline_dir:1604: 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 loop0): empty_inline_dir:1858: 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 loop0): empty_inline_dir:1865: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs warning (device loop0): empty_inline_dir:1865: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs warning (device loop0): empty_inline_dir:1865: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs warning (device loop0): empty_inline_dir:1865: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs warning (device loop0): empty_inline_dir:1865: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs warning (device loop0): empty_inline_dir:1865: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs warning (device loop0): empty_inline_dir:1865: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs warning (device loop0): empty_inline_dir:1865: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60