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BUG: KASAN: stack-out-of-bounds in cp2112_write_req drivers/hid/hid-cp2112.c:483 [inline]
BUG: KASAN: stack-out-of-bounds in cp2112_xfer+0x714/0xf00 drivers/hid/hid-cp2112.c:698
Read of size 42 at addr ffffc9000c60fd41 by task syz.1.140/6307

CPU: 1 PID: 6307 Comm: syz.1.140 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0xac/0x220 mm/kasan/report.c:468
 kasan_report+0x117/0x150 mm/kasan/report.c:581
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x288/0x290 mm/kasan/generic.c:187
 __asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105
 cp2112_write_req drivers/hid/hid-cp2112.c:483 [inline]
 cp2112_xfer+0x714/0xf00 drivers/hid/hid-cp2112.c:698
 __i2c_smbus_xfer+0x888/0x1d90 drivers/i2c/i2c-core-smbus.c:590
 i2c_smbus_xfer+0x267/0x3a0 drivers/i2c/i2c-core-smbus.c:545
 i2cdev_ioctl_smbus+0x423/0x670 drivers/i2c/i2c-dev.c:381
 i2cdev_ioctl+0x5d1/0x7e0 drivers/i2c/i2c-dev.c:467
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:871 [inline]
 __se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f35cbb8f749
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:00007f35cca6b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f35cbde6090 RCX: 00007f35cbb8f749
RDX: 0000200000000200 RSI: 0000000000000720 RDI: 0000000000000005
RBP: 00007f35cbc13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f35cbde6128 R14: 00007f35cbde6090 R15: 00007ffc67b26668
 </TASK>

The buggy address belongs to stack of task syz.1.140/6307
 and is located at offset 33 in frame:
 i2cdev_ioctl_smbus+0x0/0x670

This frame has 1 object:
 [32, 66) 'temp'

The buggy address belongs to a 8-page vmalloc region starting at 0xffffc9000c608000 allocated at copy_process+0x549/0x3d70 kernel/fork.c:2331
The buggy address belongs to the physical page:
page:ffffea0000a36240 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x28d89
memcg:ffff88801a352002
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff ffff88801a352002
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x102dc2(GFP_HIGHUSER|__GFP_NOWARN|__GFP_ZERO), pid 6291, tgid 6291 (syz.1.140), ts 129156674332, free_ts 116941492412
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1cd/0x210 mm/page_alloc.c:1554
 prep_new_page mm/page_alloc.c:1561 [inline]
 get_page_from_freelist+0x195c/0x19f0 mm/page_alloc.c:3191
 __alloc_pages+0x1e3/0x460 mm/page_alloc.c:4457
 vm_area_alloc_pages mm/vmalloc.c:3089 [inline]
 __vmalloc_area_node mm/vmalloc.c:3158 [inline]
 __vmalloc_node_range+0x96b/0x1320 mm/vmalloc.c:3339
 alloc_thread_stack_node kernel/fork.c:310 [inline]
 dup_task_struct+0x3d0/0x7c0 kernel/fork.c:1124
 copy_process+0x549/0x3d70 kernel/fork.c:2331
 kernel_clone+0x21b/0x840 kernel/fork.c:2914
 __do_sys_clone3 kernel/fork.c:3215 [inline]
 __se_sys_clone3+0x252/0x2c0 kernel/fork.c:3199
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1154 [inline]
 free_unref_page_prepare+0x7ce/0x8e0 mm/page_alloc.c:2336
 free_unref_page_list+0xbe/0x860 mm/page_alloc.c:2475
 release_pages+0x1fa0/0x2220 mm/swap.c:1022
 __folio_batch_release+0x71/0xe0 mm/swap.c:1042
 folio_batch_release include/linux/pagevec.h:83 [inline]
 truncate_inode_pages_range+0x358/0xf00 mm/truncate.c:396
 kill_bdev block/bdev.c:76 [inline]
 blkdev_flush_mapping+0x132/0x290 block/bdev.c:649
 blkdev_put_whole block/bdev.c:680 [inline]
 blkdev_put+0x498/0x760 block/bdev.c:958
 blkdev_release+0x84/0x90 block/fops.c:604
 __fput+0x234/0x970 fs/file_table.c:384
 task_work_run+0x1ce/0x250 kernel/task_work.c:245
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0xf6/0x180 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Memory state around the buggy address:
 ffffc9000c60fc00: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 f3 f3 f3
 ffffc9000c60fc80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc9000c60fd00: 00 00 00 00 f1 f1 f1 f1 00 00 00 00 02 f3 f3 f3
                                                       ^
 ffffc9000c60fd80: f3 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00
 ffffc9000c60fe00: f1 f1 f1 f1 04 f2 00 00 f2 f2 00 00 f3 f3 f3 f3
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