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BUG: KASAN: slab-out-of-bounds in ext4_xattr_set_entry+0xff8/0x15c0 fs/ext4/xattr.c:1740
Write of size 1032 at addr ffff0000d9265800 by task syz.4.412/9235

CPU: 0 UID: 0 PID: 9235 Comm: syz.4.412 Tainted: G             L      syzkaller #0 PREEMPT 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/03/2025
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+0xa8/0x238 mm/kasan/report.c:378
 print_report+0x68/0x84 mm/kasan/report.c:482
 kasan_report+0xb0/0x110 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x264/0x2a4 mm/kasan/generic.c:200
 __asan_memset+0x34/0x64 mm/kasan/shadow.c:84
 ext4_xattr_set_entry+0xff8/0x15c0 fs/ext4/xattr.c:1740
 ext4_xattr_block_set+0x5fc/0x24bc fs/ext4/xattr.c:2029
 ext4_xattr_set_handle+0xde8/0x1260 fs/ext4/xattr.c:2456
 ext4_xattr_set+0x1e4/0x2b8 fs/ext4/xattr.c:2558
 ext4_xattr_trusted_set+0x4c/0x64 fs/ext4/xattr_trusted.c:38
 __vfs_setxattr+0x3d8/0x400 fs/xattr.c:200
 __vfs_setxattr_noperm+0x120/0x5c4 fs/xattr.c:234
 __vfs_setxattr_locked+0x1e8/0x214 fs/xattr.c:295
 vfs_setxattr+0x158/0x2a8 fs/xattr.c:321
 do_setxattr fs/xattr.c:636 [inline]
 filename_setxattr+0x20c/0x4f8 fs/xattr.c:665
 path_setxattrat+0x2e8/0x320 fs/xattr.c:713
 __do_sys_lsetxattr fs/xattr.c:754 [inline]
 __se_sys_lsetxattr fs/xattr.c:750 [inline]
 __arm64_sys_lsetxattr+0xc0/0xdc fs/xattr.c:750
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596

Allocated by task 9235:
 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:5657 [inline]
 __kmalloc_node_track_caller_noprof+0x510/0x778 mm/slub.c:5764
 kmemdup_noprof+0x44/0x8c mm/util.c:138
 kmemdup_noprof include/linux/fortify-string.h:765 [inline]
 ext4_xattr_block_set+0x544/0x24bc fs/ext4/xattr.c:1977
 ext4_xattr_set_handle+0xde8/0x1260 fs/ext4/xattr.c:2456
 ext4_xattr_set+0x1e4/0x2b8 fs/ext4/xattr.c:2558
 ext4_xattr_trusted_set+0x4c/0x64 fs/ext4/xattr_trusted.c:38
 __vfs_setxattr+0x3d8/0x400 fs/xattr.c:200
 __vfs_setxattr_noperm+0x120/0x5c4 fs/xattr.c:234
 __vfs_setxattr_locked+0x1e8/0x214 fs/xattr.c:295
 vfs_setxattr+0x158/0x2a8 fs/xattr.c:321
 do_setxattr fs/xattr.c:636 [inline]
 filename_setxattr+0x20c/0x4f8 fs/xattr.c:665
 path_setxattrat+0x2e8/0x320 fs/xattr.c:713
 __do_sys_lsetxattr fs/xattr.c:754 [inline]
 __se_sys_lsetxattr fs/xattr.c:750 [inline]
 __arm64_sys_lsetxattr+0xc0/0xdc fs/xattr.c:750
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x254 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xe8/0x23c arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
 el0_svc+0x5c/0x26c arch/arm64/kernel/entry-common.c:724
 el0t_64_sync_handler+0x84/0x12c arch/arm64/kernel/entry-common.c:743
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:596

The buggy address belongs to the object at ffff0000d9265800
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 0 bytes inside of
 allocated 1024-byte region [ffff0000d9265800, ffff0000d9265c00)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x119260
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 fffffdffc3571000 dead000000000002
raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
head: 05ffc00000000040 ffff0000c0001dc0 fffffdffc3571000 dead000000000002
head: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
head: 05ffc00000000003 fffffdffc3649801 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000d9265b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000d9265b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff0000d9265c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff0000d9265c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000d9265d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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