EXT4-fs (loop4): mounted filesystem without journal. Quota mode: writeback.
==================================================================
BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x979/0x21d0 fs/ext4/xattr.c:1741
Read of size 18446744073709551572 at addr ffff88811b21b850 by task syz.4.127/904

CPU: 1 PID: 904 Comm: syz.4.127 Not tainted 6.1.138-syzkaller-00046-gdb710ea87c32 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 __dump_stack+0x21/0x24 lib/dump_stack.c:88
 dump_stack_lvl+0xee/0x150 lib/dump_stack.c:106
 print_address_description+0x71/0x210 mm/kasan/report.c:316
 print_report+0x4a/0x60 mm/kasan/report.c:427
 kasan_report+0x122/0x150 mm/kasan/report.c:531
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x280/0x290 mm/kasan/generic.c:189
 memmove+0x2d/0x70 mm/kasan/shadow.c:54
 ext4_xattr_set_entry+0x979/0x21d0 fs/ext4/xattr.c:1741
 ext4_xattr_block_set+0xada/0x3270 fs/ext4/xattr.c:1988
 ext4_xattr_move_to_block fs/ext4/xattr.c:2625 [inline]
 ext4_xattr_make_inode_space fs/ext4/xattr.c:2700 [inline]
 ext4_expand_extra_isize_ea+0xf30/0x1990 fs/ext4/xattr.c:2792
 __ext4_expand_extra_isize+0x2fe/0x3e0 fs/ext4/inode.c:5967
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6010 [inline]
 __ext4_mark_inode_dirty+0x3cf/0x600 fs/ext4/inode.c:6088
 __ext4_unlink+0x673/0xb00 fs/ext4/namei.c:3341
 ext4_unlink+0x13a/0x3a0 fs/ext4/namei.c:3370
 vfs_unlink+0x39f/0x630 fs/namei.c:4321
 do_unlinkat+0x31f/0x6b0 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+0x958/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:88
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f5cf8b8e969
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:00007f5cf9a6c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 00007f5cf8db5fa0 RCX: 00007f5cf8b8e969
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000180
RBP: 00007f5cf8c10ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f5cf8db5fa0 R15: 00007fff42e80f38
 </TASK>

Allocated by task 904:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 kasan_save_alloc_info+0x25/0x30 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:379 [inline]
 __kasan_kmalloc+0x95/0xb0 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+0xb1/0x1e0 mm/slab_common.c:958
 kmemdup+0x2b/0x60 mm/util.c:134
 _Z7kmemdupPKvU17pass_object_size0mj include/linux/fortify-string.h:585 [inline]
 ext4_xattr_block_set+0x9dc/0x3270 fs/ext4/xattr.c:1936
 ext4_xattr_move_to_block fs/ext4/xattr.c:2625 [inline]
 ext4_xattr_make_inode_space fs/ext4/xattr.c:2700 [inline]
 ext4_expand_extra_isize_ea+0xf30/0x1990 fs/ext4/xattr.c:2792
 __ext4_expand_extra_isize+0x2fe/0x3e0 fs/ext4/inode.c:5967
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:6010 [inline]
 __ext4_mark_inode_dirty+0x3cf/0x600 fs/ext4/inode.c:6088
 __ext4_unlink+0x673/0xb00 fs/ext4/namei.c:3341
 ext4_unlink+0x13a/0x3a0 fs/ext4/namei.c:3370
 vfs_unlink+0x39f/0x630 fs/namei.c:4321
 do_unlinkat+0x31f/0x6b0 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+0x958/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:88
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

The buggy address belongs to the object at ffff88811b21b800
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 80 bytes inside of
 1024-byte region [ffff88811b21b800, ffff88811b21bc00)

The buggy address belongs to the physical page:
page:ffffea00046c8600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11b218
head:ffffea00046c8600 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 ffffea00046aac00 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 103, tgid 103 (udevd), ts 5308862969, free_ts 0
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2637
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2644
 get_page_from_freelist+0x2c6e/0x2ce0 mm/page_alloc.c:4539
 __alloc_pages+0x19e/0x3a0 mm/page_alloc.c:5842
 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1
 allocate_slab mm/slub.c:1962 [inline]
 new_slab+0x98/0x3d0 mm/slub.c:2015
 ___slab_alloc+0x6f6/0xb50 mm/slub.c:3203
 __slab_alloc+0x5e/0xa0 mm/slub.c:3302
 slab_alloc_node mm/slub.c:3387 [inline]
 __kmem_cache_alloc_node+0x203/0x2c0 mm/slub.c:3462
 __do_kmalloc_node mm/slab_common.c:937 [inline]
 __kmalloc_node_track_caller+0xa0/0x1e0 mm/slab_common.c:958
 kmalloc_reserve net/core/skbuff.c:446 [inline]
 __alloc_skb+0x224/0x7e0 net/core/skbuff.c:515
 alloc_skb include/linux/skbuff.h:1290 [inline]
 netlink_alloc_large_skb net/netlink/af_netlink.c:1184 [inline]
 netlink_sendmsg+0x626/0xbc0 net/netlink/af_netlink.c:1835
 sock_sendmsg_nosec net/socket.c:716 [inline]
 __sock_sendmsg net/socket.c:728 [inline]
 ____sys_sendmsg+0x5a9/0x990 net/socket.c:2509
 ___sys_sendmsg+0x21c/0x290 net/socket.c:2563
 __sys_sendmsg net/socket.c:2592 [inline]
 __do_sys_sendmsg net/socket.c:2601 [inline]
 __se_sys_sendmsg net/socket.c:2599 [inline]
 __x64_sys_sendmsg+0x1f0/0x2c0 net/socket.c:2599
 x64_sys_call+0x171/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88811b21b700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88811b21b780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88811b21b800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                                 ^
 ffff88811b21b880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88811b21b900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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