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BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0xb34/0x2d98 fs/ext4/xattr.c:1747
Read of size 18446744073709551540 at addr ffff0000c8f29070 by task syz.3.31/4278

CPU: 1 PID: 4278 Comm: syz.3.31 Not tainted 5.15.182-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Call trace:
 dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
 print_address_description+0x78/0x30c mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0xec/0x15c mm/kasan/report.c:451
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x270/0x2b0 mm/kasan/generic.c:189
 memmove+0x90/0xe8 mm/kasan/shadow.c:54
 ext4_xattr_set_entry+0xb34/0x2d98 fs/ext4/xattr.c:1747
 ext4_xattr_block_set+0x528/0x26fc fs/ext4/xattr.c:2004
 ext4_xattr_set_handle+0xa08/0x1050 fs/ext4/xattr.c:2412
 ext4_xattr_set+0x1e0/0x2b4 fs/ext4/xattr.c:2522
 ext4_xattr_trusted_set+0x4c/0x64 fs/ext4/xattr_trusted.c:38
 __vfs_setxattr+0x388/0x3a4 fs/xattr.c:182
 __vfs_setxattr_noperm+0x120/0x564 fs/xattr.c:216
 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:277
 vfs_setxattr+0x158/0x2ac fs/xattr.c:303
 do_setxattr fs/xattr.c:588 [inline]
 setxattr+0x248/0x2ac fs/xattr.c:611
 path_setxattr+0x12c/0x25c fs/xattr.c:630
 __do_sys_lsetxattr fs/xattr.c:653 [inline]
 __se_sys_lsetxattr fs/xattr.c:649 [inline]
 __arm64_sys_lsetxattr+0xbc/0xd8 fs/xattr.c:649
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

Allocated by task 4278:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 ____kasan_kmalloc mm/kasan/common.c:513 [inline]
 __kasan_kmalloc+0xb0/0xf0 mm/kasan/common.c:522
 kasan_kmalloc include/linux/kasan.h:264 [inline]
 __kmalloc_track_caller+0x218/0x370 mm/slub.c:4930
 kmemdup+0xcc/0x144 mm/util.c:128
 ext4_xattr_block_set+0x470/0x26fc fs/ext4/xattr.c:1952
 ext4_xattr_set_handle+0xa08/0x1050 fs/ext4/xattr.c:2412
 ext4_xattr_set+0x1e0/0x2b4 fs/ext4/xattr.c:2522
 ext4_xattr_trusted_set+0x4c/0x64 fs/ext4/xattr_trusted.c:38
 __vfs_setxattr+0x388/0x3a4 fs/xattr.c:182
 __vfs_setxattr_noperm+0x120/0x564 fs/xattr.c:216
 __vfs_setxattr_locked+0x1ec/0x218 fs/xattr.c:277
 vfs_setxattr+0x158/0x2ac fs/xattr.c:303
 do_setxattr fs/xattr.c:588 [inline]
 setxattr+0x248/0x2ac fs/xattr.c:611
 path_setxattr+0x12c/0x25c fs/xattr.c:630
 __do_sys_lsetxattr fs/xattr.c:653 [inline]
 __se_sys_lsetxattr fs/xattr.c:649 [inline]
 __arm64_sys_lsetxattr+0xbc/0xd8 fs/xattr.c:649
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

The buggy address belongs to the object at ffff0000c8f29000
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 112 bytes inside of
 1024-byte region [ffff0000c8f29000, ffff0000c8f29400)
The buggy address belongs to the page:
page:000000005222864a refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x108f28
head:000000005222864a order:3 compound_mapcount:0 compound_pincount:0
flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000010200 0000000000000000 0000000c00000001 ffff0000c0002780
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000c8f28f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000c8f28f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff0000c8f29000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                                             ^
 ffff0000c8f29080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000c8f29100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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