================================================================== 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+0x525/0xee0 fs/ext4/inline.c:1533 Read of size 68 at addr ffff888127cd3d05 by task syz-executor245/300 CPU: 0 PID: 300 Comm: syz-executor245 Not tainted 5.15.175-syzkaller-00803-g19092c8155b4 #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+0x151/0x1c0 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 kasan_check_range+0x293/0x2a0 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+0x525/0xee0 fs/ext4/inline.c:1533 ext4_readdir+0x410/0x3960 fs/ext4/dir.c:158 iterate_dir+0x265/0x600 __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:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f59c9b63133 Code: c1 66 0f 1f 44 00 00 48 83 c4 08 48 89 ef 5b 5d e9 62 47 fb 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 b8 ff ff ff f7 d8 RSP: 002b:00007ffdca7bed08 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 000055556187b770 RCX: 00007f59c9b63133 RDX: 0000000000008000 RSI: 000055556187b770 RDI: 0000000000000005 RBP: 000055556187b744 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000001000 R11: 0000000000000293 R12: ffffffffffffffb8 R13: 0000000000000016 R14: 000055556187b740 R15: 00007ffdca7c2070 The buggy address belongs to the page: page:ffffea00049f34c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x127cd3 flags: 0x4000000000000000(zone=1) raw: 4000000000000000 ffffea00049f3508 ffffea00049f3488 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 0x100dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO), pid 234, ts 17127654341, free_ts 17139797497 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] do_anonymous_page mm/memory.c:4066 [inline] handle_pte_fault+0xe7e/0x25c0 mm/memory.c:4903 do_handle_mm_fault+0x20bc/0x2400 mm/memory.c:5327 handle_mm_fault include/linux/mm.h:1836 [inline] do_user_addr_fault arch/x86/mm/fault.c:1418 [inline] handle_page_fault arch/x86/mm/fault.c:1509 [inline] exc_page_fault+0x3b5/0x7f0 arch/x86/mm/fault.c:1565 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:606 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 free_pages_and_swap_cache+0x8a/0xa0 mm/swap_state.c:320 tlb_batch_pages_flush mm/mmu_gather.c:49 [inline] tlb_flush_mmu_free mm/mmu_gather.c:240 [inline] tlb_flush_mmu mm/mmu_gather.c:247 [inline] tlb_finish_mmu+0x177/0x320 mm/mmu_gather.c:338 unmap_region+0x304/0x350 mm/mmap.c:2680 __do_munmap+0x13e4/0x19d0 mm/mmap.c:2913 __vm_munmap+0x166/0x2a0 mm/mmap.c:2966 __do_sys_munmap mm/mmap.c:2992 [inline] __se_sys_munmap mm/mmap.c:2988 [inline] __x64_sys_munmap+0x6b/0x80 mm/mmap.c:2988 x64_sys_call+0x75/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:12 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 Memory state around the buggy address: ffff888127cd3c00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888127cd3c80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff888127cd3d00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888127cd3d80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888127cd3e00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== EXT4-fs error (device loop4): ext4_read_inline_dir:1614: inode #12: block 5: comm syz-executor245: path /root/syzkaller.4UZACA/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 loop4): ext4_read_inline_dir:1614: inode #12: block 5: comm syz-executor245: path /root/syzkaller.4UZACA/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 loop4): empty_inline_dir:1869: inode #12: block 5: comm syz-executor245: bad entry in directory: rec_len % 4 != 0 - offset=4, inode=1633771873, rec_len=24929, size=60 fake=0 EXT4-fs warning (device loop4): empty_inline_dir:1876: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs error (device loop4): ext4_read_inline_dir:1614: inode #12: block 5: comm syz-executor245: path /root/syzkaller.4UZACA/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 loop4): ext4_read_inline_dir:1614: inode #12: block 5: comm syz-executor245: path /root/syzkaller.4UZACA/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 loop4): empty_inline_dir:1869: inode #12: block 5: comm syz-executor245: bad entry in directory: rec_len % 4 != 0 - offset=4, inode=1633771873, rec_len=24929, size=60 fake=0 EXT4-fs warning (device loop4): empty_inline_dir:1876: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs error (device loop4): ext4_read_inline_dir:1614: inode #12: block 5: comm syz-executor245: path /root/syzkaller.4UZACA/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 loop4): ext4_read_inline_dir:1614: inode #12: block 5: comm syz-executor245: path /root/syzkaller.4UZACA/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 loop4): empty_inline_dir:1869: inode #12: block 5: comm syz-executor245: bad entry in directory: rec_len % 4 != 0 - offset=4, inode=1633771873, rec_len=24929, size=60 fake=0 EXT4-fs warning (device loop4): empty_inline_dir:1876: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs warning (device loop4): empty_inline_dir:1876: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs warning (device loop4): empty_inline_dir:1876: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs warning (device loop4): empty_inline_dir:1876: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs warning (device loop4): empty_inline_dir:1876: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs warning (device loop4): empty_inline_dir:1876: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs warning (device loop4): empty_inline_dir:1876: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs warning (device loop4): empty_inline_dir:1876: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60