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BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x979/0x21d0 fs/ext4/xattr.c:1732
Read of size 18446744073709551572 at addr ffff88811bc8e050 by task syz.2.15/478

CPU: 0 PID: 478 Comm: syz.2.15 Not tainted 6.1.134-syzkaller-1169243-ga4fc1bef0501 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
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:1732
 ext4_xattr_block_set+0xada/0x3270 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+0xf30/0x1990 fs/ext4/xattr.c:2783
 __ext4_expand_extra_isize+0x2fe/0x3e0 fs/ext4/inode.c:5938
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5981 [inline]
 __ext4_mark_inode_dirty+0x3cf/0x600 fs/ext4/inode.c:6059
 __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: 0033:0x7f82b717e719
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:00007f82b7f6f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 00007f82b7335f80 RCX: 00007f82b717e719
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000180
RBP: 00007f82b71f132e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f82b7335f80 R15: 00007fff663927a8
 </TASK>

Allocated by task 478:
 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: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+0xf30/0x1990 fs/ext4/xattr.c:2783
 __ext4_expand_extra_isize+0x2fe/0x3e0 fs/ext4/inode.c:5938
 ext4_try_to_expand_extra_isize fs/ext4/inode.c:5981 [inline]
 __ext4_mark_inode_dirty+0x3cf/0x600 fs/ext4/inode.c:6059
 __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 ffff88811bc8e000
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 80 bytes inside of
 1024-byte region [ffff88811bc8e000, ffff88811bc8e400)

The buggy address belongs to the physical page:
page:ffffea00046f2200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11bc88
head:ffffea00046f2200 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 ffffea00046e5e00 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 120, tgid 120 (S30dbus), ts 5510699589, 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:5838
 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+0xa1/0x1e0 mm/slab_common.c:951
 kmalloc include/linux/slab.h:568 [inline]
 load_elf_phdrs fs/binfmt_elf.c:481 [inline]
 load_elf_binary+0x2cf/0x2710 fs/binfmt_elf.c:861
 search_binary_handler fs/exec.c:1743 [inline]
 exec_binprm fs/exec.c:1784 [inline]
 bprm_execve+0x787/0x1440 fs/exec.c:1853
 do_execveat_common+0x915/0xa70 fs/exec.c:1958
 do_execve fs/exec.c:2032 [inline]
 __do_sys_execve fs/exec.c:2108 [inline]
 __se_sys_execve fs/exec.c:2103 [inline]
 __x64_sys_execve+0x92/0xb0 fs/exec.c:2103
 x64_sys_call+0x98/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:60
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88811bc8df00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88811bc8df80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88811bc8e000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                                 ^
 ffff88811bc8e080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88811bc8e100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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