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BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x8e9/0x1e20 fs/ext4/xattr.c:1783
Read of size 18446744073709551588 at addr ffff88802a8cd040 by task syz.1.738/8060

CPU: 1 UID: 0 PID: 8060 Comm: syz.1.738 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xba/0x230 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200
 __asan_memmove+0x29/0x70 mm/kasan/shadow.c:94
 ext4_xattr_set_entry+0x8e9/0x1e20 fs/ext4/xattr.c:1783
 ext4_xattr_block_set+0x878/0x2ad0 fs/ext4/xattr.c:2030
 ext4_xattr_set_handle+0x1286/0x14c0 fs/ext4/xattr.c:2457
 ext4_xattr_set+0x255/0x340 fs/ext4/xattr.c:2559
 __vfs_setxattr+0x43c/0x480 fs/xattr.c:200
 __vfs_setxattr_noperm+0x12d/0x660 fs/xattr.c:234
 vfs_setxattr+0x163/0x360 fs/xattr.c:321
 do_setxattr fs/xattr.c:636 [inline]
 filename_setxattr+0x296/0x630 fs/xattr.c:664
 path_setxattrat+0x3eb/0x440 fs/xattr.c:708
 __do_sys_setxattr fs/xattr.c:742 [inline]
 __se_sys_setxattr fs/xattr.c:738 [inline]
 __x64_sys_setxattr+0xbc/0xe0 fs/xattr.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f98d2d9aeb9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f98d3c0d028 EFLAGS: 00000246 ORIG_RAX: 00000000000000bc
RAX: ffffffffffffffda RBX: 00007f98d3015fa0 RCX: 00007f98d2d9aeb9
RDX: 0000200000000100 RSI: 00002000000000c0 RDI: 0000200000000080
RBP: 00007f98d2e08c1f R08: 0000000000000000 R09: 0000000000000000
R10: 00000000000003c8 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f98d3016038 R14: 00007f98d3015fa0 R15: 00007ffd1a573958
 </TASK>

Allocated by task 8060:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5170 [inline]
 __kmalloc_node_track_caller_noprof+0x4db/0x7b0 mm/slub.c:5278
 kmemdup_noprof+0x2b/0x70 mm/util.c:138
 kmemdup_noprof include/linux/fortify-string.h:763 [inline]
 ext4_xattr_block_set+0x787/0x2ad0 fs/ext4/xattr.c:1978
 ext4_xattr_set_handle+0x1286/0x14c0 fs/ext4/xattr.c:2457
 ext4_xattr_set+0x255/0x340 fs/ext4/xattr.c:2559
 __vfs_setxattr+0x43c/0x480 fs/xattr.c:200
 __vfs_setxattr_noperm+0x12d/0x660 fs/xattr.c:234
 vfs_setxattr+0x163/0x360 fs/xattr.c:321
 do_setxattr fs/xattr.c:636 [inline]
 filename_setxattr+0x296/0x630 fs/xattr.c:664
 path_setxattrat+0x3eb/0x440 fs/xattr.c:708
 __do_sys_setxattr fs/xattr.c:742 [inline]
 __se_sys_setxattr fs/xattr.c:738 [inline]
 __x64_sys_setxattr+0xbc/0xe0 fs/xattr.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88802a8cd000
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 64 bytes inside of
 1024-byte region [ffff88802a8cd000, ffff88802a8cd400)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2a8c8
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88813ffa6dc0 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88813ffa6dc0 dead000000000100 dead000000000122
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000003 ffffea0000aa3201 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
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 5872, tgid 5872 (udevd), ts 175833367059, free_ts 175820509578
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x231/0x280 mm/page_alloc.c:1883
 prep_new_page mm/page_alloc.c:1891 [inline]
 get_page_from_freelist+0x24dc/0x2580 mm/page_alloc.c:3956
 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5244
 alloc_slab_page mm/slub.c:3235 [inline]
 allocate_slab+0x7b/0x660 mm/slub.c:3408
 new_slab mm/slub.c:3466 [inline]
 refill_objects+0x33a/0x3d0 mm/slub.c:7077
 refill_sheaf mm/slub.c:2784 [inline]
 __pcs_replace_empty_main+0x2b9/0x620 mm/slub.c:4529
 alloc_from_pcs mm/slub.c:4632 [inline]
 slab_alloc_node mm/slub.c:4766 [inline]
 __do_kmalloc_node mm/slub.c:5169 [inline]
 __kmalloc_node_track_caller_noprof+0x572/0x7b0 mm/slub.c:5278
 kmalloc_reserve net/core/skbuff.c:634 [inline]
 __alloc_skb+0x2c1/0x7d0 net/core/skbuff.c:712
 netlink_sendmsg+0x5d4/0xb40 net/netlink/af_netlink.c:1869
 sock_sendmsg_nosec+0x18f/0x1d0 net/socket.c:737
 __sock_sendmsg net/socket.c:752 [inline]
 ____sys_sendmsg+0x589/0x8c0 net/socket.c:2610
 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2664
 __sys_sendmsg net/socket.c:2696 [inline]
 __do_sys_sendmsg net/socket.c:2701 [inline]
 __se_sys_sendmsg net/socket.c:2699 [inline]
 __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2699
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 5872 tgid 5872 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1432 [inline]
 __free_frozen_pages+0xc01/0xd80 mm/page_alloc.c:2972
 __slab_free+0x263/0x2b0 mm/slub.c:5483
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4452 [inline]
 slab_alloc_node mm/slub.c:4781 [inline]
 kmem_cache_alloc_noprof+0x2bc/0x650 mm/slub.c:4788
 alloc_filename fs/namei.c:142 [inline]
 do_getname+0x2e/0x250 fs/namei.c:182
 getname include/linux/fs.h:2512 [inline]
 class_filename_constructor include/linux/fs.h:2539 [inline]
 do_sys_openat2+0xca/0x200 fs/open.c:1365
 do_sys_open fs/open.c:1372 [inline]
 __do_sys_openat fs/open.c:1388 [inline]
 __se_sys_openat fs/open.c:1383 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1383
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88802a8ccf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88802a8ccf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88802a8cd000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                           ^
 ffff88802a8cd080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88802a8cd100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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