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BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x909/0x1fa0 fs/ext4/xattr.c:1732
Read of size 18446744073709551572 at addr ffff88811da20050 by task syz.3.406/2155

CPU: 1 PID: 2155 Comm: syz.3.406 Not tainted 6.1.118-syzkaller-00021-gd12538e9da37 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:
 <TASK>
 __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
 kasan_check_range+0x294/0x2a0 mm/kasan/generic.c:189
 memmove+0x2d/0x70 mm/kasan/shadow.c:54
 ext4_xattr_set_entry+0x909/0x1fa0 fs/ext4/xattr.c:1732
 ext4_xattr_block_set+0x99c/0x37f0 fs/ext4/xattr.c:1979
 ext4_xattr_move_to_block fs/ext4/xattr.c:2616 [inline]
 ext4_xattr_make_inode_space fs/ext4/xattr.c:2691 [inline]
 ext4_expand_extra_isize_ea+0x10eb/0x1c40 fs/ext4/xattr.c:2783
 __ext4_expand_extra_isize+0x31a/0x420 fs/ext4/inode.c:5938
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5981 [inline]
 __ext4_mark_inode_dirty+0x4bb/0x7d0 fs/ext4/inode.c:6059
 __ext4_unlink+0x6ed/0xba0 fs/ext4/namei.c:3341
 ext4_unlink+0x142/0x3f0 fs/ext4/namei.c:3370
 vfs_unlink+0x38c/0x630 fs/namei.c:4321
 do_unlinkat+0x483/0x920 fs/namei.c:4389
 __do_sys_unlink fs/namei.c:4437 [inline]
 __se_sys_unlink fs/namei.c:4435 [inline]
 __x64_sys_unlink+0x49/0x50 fs/namei.c:4435
 x64_sys_call+0x289/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:88
 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: 0033:0x7fdefe785d29
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:00007fdeff63b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 00007fdefe975fa0 RCX: 00007fdefe785d29
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000180
RBP: 00007fdefe801b08 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fdefe975fa0 R15: 00007ffdf28c0728
 </TASK>

Allocated by task 2155:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:379 [inline]
 __kasan_kmalloc+0x9c/0xb0 mm/kasan/common.c:388
 kasan_kmalloc include/linux/kasan.h:212 [inline]
 __do_kmalloc_node mm/slab_common.c:938 [inline]
 __kmalloc_node_track_caller+0xb3/0x1e0 mm/slab_common.c:958
 kmemdup+0x29/0x60 mm/util.c:134
 _Z7kmemdupPKvU17pass_object_size0mj include/linux/fortify-string.h:585 [inline]
 ext4_xattr_block_set+0x80f/0x37f0 fs/ext4/xattr.c:1927
 ext4_xattr_move_to_block fs/ext4/xattr.c:2616 [inline]
 ext4_xattr_make_inode_space fs/ext4/xattr.c:2691 [inline]
 ext4_expand_extra_isize_ea+0x10eb/0x1c40 fs/ext4/xattr.c:2783
 __ext4_expand_extra_isize+0x31a/0x420 fs/ext4/inode.c:5938
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5981 [inline]
 __ext4_mark_inode_dirty+0x4bb/0x7d0 fs/ext4/inode.c:6059
 __ext4_unlink+0x6ed/0xba0 fs/ext4/namei.c:3341
 ext4_unlink+0x142/0x3f0 fs/ext4/namei.c:3370
 vfs_unlink+0x38c/0x630 fs/namei.c:4321
 do_unlinkat+0x483/0x920 fs/namei.c:4389
 __do_sys_unlink fs/namei.c:4437 [inline]
 __se_sys_unlink fs/namei.c:4435 [inline]
 __x64_sys_unlink+0x49/0x50 fs/namei.c:4435
 x64_sys_call+0x289/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:88
 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

The buggy address belongs to the object at ffff88811da20000
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 80 bytes inside of
 1024-byte region [ffff88811da20000, ffff88811da20400)

The buggy address belongs to the physical page:
page:ffffea0004768800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11da20
head:ffffea0004768800 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 ffffea000446b600 dead000000000002 ffff888100043080
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 165, tgid 165 (dhcpcd-run-hook), ts 6041773292, free_ts 0
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x213/0x220 mm/page_alloc.c:2590
 prep_new_page+0x1b/0x110 mm/page_alloc.c:2597
 get_page_from_freelist+0x2f41/0x2fc0 mm/page_alloc.c:4462
 __alloc_pages+0x234/0x610 mm/page_alloc.c:5759
 alloc_slab_page+0x6c/0xf0
 allocate_slab mm/slub.c:1962 [inline]
 new_slab+0x90/0x3e0 mm/slub.c:2015
 ___slab_alloc+0x6f9/0xb80 mm/slub.c:3203
 __slab_alloc+0x5d/0xa0 mm/slub.c:3302
 slab_alloc_node mm/slub.c:3387 [inline]
 __kmem_cache_alloc_node+0x207/0x2a0 mm/slub.c:3462
 __do_kmalloc_node mm/slab_common.c:937 [inline]
 __kmalloc+0xa3/0x1e0 mm/slab_common.c:951
 kmalloc_array include/linux/slab.h:609 [inline]
 kcalloc include/linux/slab.h:640 [inline]
 alloc_pipe_info+0x204/0x4b0 fs/pipe.c:812
 get_pipe_inode fs/pipe.c:886 [inline]
 create_pipe_files+0x89/0x6e0 fs/pipe.c:918
 __do_pipe_flags+0x4c/0x210 fs/pipe.c:967
 do_pipe2+0xd0/0x300 fs/pipe.c:1015
 __do_sys_pipe2 fs/pipe.c:1033 [inline]
 __se_sys_pipe2 fs/pipe.c:1031 [inline]
 __x64_sys_pipe2+0x5a/0x70 fs/pipe.c:1031
 x64_sys_call+0x7bb/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:294
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88811da1ff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88811da1ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88811da20000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                                 ^
 ffff88811da20080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88811da20100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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