================================================================== 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+0x525/0xee0 fs/ext4/inline.c:1515 Read of size 68 at addr ffff888121fa1d05 by task syz-executor/501 CPU: 0 PID: 501 Comm: syz-executor Not tainted 5.10.226-syzkaller-1003632-g139a6bb26d9d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118 print_address_description+0x81/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0x179/0x1c0 mm/kasan/report.c:452 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:209 [inline] ext4_read_inline_dir+0x525/0xee0 fs/ext4/inline.c:1515 ext4_readdir+0x3c5/0x37c0 fs/ext4/dir.c:158 iterate_dir+0x265/0x580 __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 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f9b5ce9f193 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:00007ffd1393a1c8 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 00005555585b4520 RCX: 00007f9b5ce9f193 RDX: 0000000000008000 RSI: 00005555585b4520 RDI: 0000000000000006 RBP: 00005555585b44f4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000001000 R11: 0000000000000293 R12: ffffffffffffffa8 R13: 0000000000000016 R14: 00005555585b44f0 R15: 00007ffd1393d560 The buggy address belongs to the page: page:ffffea000487e840 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x121fa1 flags: 0x4000000000000000() raw: 4000000000000000 ffffea000487e7c8 ffffea00049a7e48 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 0x8100dca(GFP_HIGHUSER_MOVABLE|__GFP_ZERO|0x8000000), pid 518, ts 52752913924, free_ts 52929351790 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x166/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x2d8c/0x2f30 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x435/0xaf0 mm/page_alloc.c:5348 __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] do_anonymous_page mm/memory.c:3935 [inline] handle_pte_fault+0x175a/0x3e10 mm/memory.c:4758 __handle_mm_fault mm/memory.c:4916 [inline] handle_mm_fault+0x11d6/0x1a10 mm/memory.c:5330 do_user_addr_fault arch/x86/mm/fault.c:1362 [inline] handle_page_fault arch/x86/mm/fault.c:1428 [inline] exc_page_fault+0x2a6/0x5b0 arch/x86/mm/fault.c:1484 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:571 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+0x2ae/0x2d0 mm/page_alloc.c:3336 free_unref_page_list+0x122/0xb20 mm/page_alloc.c:3443 release_pages+0xea0/0xef0 mm/swap.c:1103 free_pages_and_swap_cache+0x8a/0xa0 mm/swap_state.c:356 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:326 exit_mmap+0x312/0x5c0 mm/mmap.c:3357 __mmput+0x95/0x2d0 kernel/fork.c:1153 mmput+0x59/0x170 kernel/fork.c:1176 exit_mm kernel/exit.c:539 [inline] do_exit+0xbda/0x2a50 kernel/exit.c:850 do_group_exit+0x141/0x310 kernel/exit.c:985 get_signal+0x10a0/0x1410 kernel/signal.c:2790 arch_do_signal_or_restart+0xbd/0x17c0 arch/x86/kernel/signal.c:805 handle_signal_work kernel/entry/common.c:145 [inline] exit_to_user_mode_loop+0x9b/0xd0 kernel/entry/common.c:169 exit_to_user_mode_prepare kernel/entry/common.c:199 [inline] syscall_exit_to_user_mode+0xa2/0x1a0 kernel/entry/common.c:274 do_syscall_64+0x40/0x70 arch/x86/entry/common.c:56 entry_SYSCALL_64_after_hwframe+0x61/0xcb Memory state around the buggy address: ffff888121fa1c00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888121fa1c80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff888121fa1d00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888121fa1d80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888121fa1e00: 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:1596: 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:1596: 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:1850: 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:1857: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs error (device loop3): ext4_read_inline_dir:1596: 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:1596: 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:1850: 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:1857: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs error (device loop3): ext4_read_inline_dir:1596: 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:1596: 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:1850: 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:1857: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs warning (device loop3): empty_inline_dir:1857: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs warning (device loop3): empty_inline_dir:1857: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs warning (device loop3): empty_inline_dir:1857: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs warning (device loop3): empty_inline_dir:1857: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs warning (device loop3): empty_inline_dir:1857: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs warning (device loop3): empty_inline_dir:1857: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60 EXT4-fs warning (device loop3): empty_inline_dir:1857: bad inline directory (dir #12) - inode 1633771873, rec_len 24929, name_len 97inline size 60