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BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x86c/0x15a0 fs/ext4/xattr.c:1763
Read of size 18446744073709551524 at addr ffff0000c7307880 by task syz.3.174/5462

CPU: 0 UID: 0 PID: 5462 Comm: syz.3.174 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call trace:
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C)
 __dump_stack+0x30/0x40 lib/dump_stack.c:94
 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120
 print_address_description+0xb0/0x238 mm/kasan/report.c:378
 print_report+0x68/0x84 mm/kasan/report.c:482
 kasan_report+0x8c/0xc4 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x17c/0x1ac mm/kasan/generic.c:200
 __asan_memmove+0x3c/0x84 mm/kasan/shadow.c:94
 ext4_xattr_set_entry+0x86c/0x15a0 fs/ext4/xattr.c:1763
 ext4_xattr_block_set+0x5ec/0x2188 fs/ext4/xattr.c:2032
 ext4_xattr_set_handle+0xad4/0xe00 fs/ext4/xattr.c:2450
 ext4_xattr_set+0x1f8/0x2c4 fs/ext4/xattr.c:2561
 ext4_xattr_trusted_set+0x4c/0x64 fs/ext4/xattr_trusted.c:38
 __vfs_setxattr+0x130/0x17c fs/xattr.c:218
 __vfs_setxattr_noperm+0x120/0x5c4 fs/xattr.c:252
 __vfs_setxattr_locked+0x114/0x248 fs/xattr.c:313
 vfs_setxattr+0x150/0x2e0 fs/xattr.c:339
 do_setxattr+0xf8/0x190 fs/xattr.c:654
 filename_setxattr+0x134/0x1f8 fs/xattr.c:682
 path_setxattrat+0x200/0x2a8 fs/xattr.c:726
 __do_sys_lsetxattr fs/xattr.c:767 [inline]
 __se_sys_lsetxattr fs/xattr.c:763 [inline]
 __arm64_sys_lsetxattr+0xc0/0xdc fs/xattr.c:763
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:140
 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:736
 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594

Allocated by task 5462:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x40/0x78 mm/kasan/common.c:78
 kasan_save_alloc_info+0x44/0x54 mm/kasan/generic.c:570
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0x9c/0xb4 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5296 [inline]
 __kmalloc_node_track_caller_noprof+0x370/0x748 mm/slub.c:5408
 kmemdup_noprof+0x44/0x8c mm/util.c:138
 kmemdup_noprof include/linux/fortify-string.h:763 [inline]
 ext4_xattr_block_set+0x538/0x2188 fs/ext4/xattr.c:1980
 ext4_xattr_set_handle+0xad4/0xe00 fs/ext4/xattr.c:2450
 ext4_xattr_set+0x1f8/0x2c4 fs/ext4/xattr.c:2561
 ext4_xattr_trusted_set+0x4c/0x64 fs/ext4/xattr_trusted.c:38
 __vfs_setxattr+0x130/0x17c fs/xattr.c:218
 __vfs_setxattr_noperm+0x120/0x5c4 fs/xattr.c:252
 __vfs_setxattr_locked+0x114/0x248 fs/xattr.c:313
 vfs_setxattr+0x150/0x2e0 fs/xattr.c:339
 do_setxattr+0xf8/0x190 fs/xattr.c:654
 filename_setxattr+0x134/0x1f8 fs/xattr.c:682
 path_setxattrat+0x200/0x2a8 fs/xattr.c:726
 __do_sys_lsetxattr fs/xattr.c:767 [inline]
 __se_sys_lsetxattr fs/xattr.c:763 [inline]
 __arm64_sys_lsetxattr+0xc0/0xdc fs/xattr.c:763
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:140
 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:736
 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594

The buggy address belongs to the object at ffff0000c7307800
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 128 bytes inside of
 1024-byte region [ffff0000c7307800, ffff0000c7307c00)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x107300
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x5ffc00000000040(head|node=0|zone=2|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 05ffc00000000040 ffff0000c0001dc0 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000
head: 05ffc00000000040 ffff0000c0001dc0 dead000000000100 dead000000000122
head: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000
head: 05ffc00000000003 fffffdffc31cc001 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000c7307780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000c7307800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000c7307880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                   ^
 ffff0000c7307900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000c7307980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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