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BUG: KASAN: slab-out-of-bounds in reg_fixed_voltage_probe+0xa8b/0xd30 drivers/regulator/fixed.c:232
Read of size 4 at addr ffff888024d73cbc by task syz.0.17/4431

CPU: 1 PID: 4431 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:316 [inline]
 print_report+0xa8/0x210 mm/kasan/report.c:420
 kasan_report+0x10b/0x140 mm/kasan/report.c:524
 reg_fixed_voltage_probe+0xa8b/0xd30 drivers/regulator/fixed.c:232
 platform_probe+0x137/0x1c0 drivers/base/platform.c:1400
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x24a/0xb40 drivers/base/dd.c:638
 __driver_probe_device+0x1f5/0x390 drivers/base/dd.c:804
 device_driver_attach+0xd9/0x1c0 drivers/base/dd.c:1131
 bind_store+0x33b/0x380 drivers/base/bus.c:216
 kernfs_fop_write_iter+0x3a0/0x520 fs/kernfs/file.c:352
 call_write_iter include/linux/fs.h:2265 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x482/0x9a0 fs/read_write.c:584
 ksys_write+0x14d/0x260 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f0d61f9e0d9
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:00007ffeb97975d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f0d62225fa0 RCX: 00007f0d61f9e0d9
RDX: 000000000000000b RSI: 0000200000000700 RDI: 0000000000000005
RBP: 00007f0d62035024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0d62225fac R14: 00007f0d62225fa0 R15: 00007f0d62225fa0
 </TASK>

Allocated by task 1:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 ____kasan_kmalloc mm/kasan/common.c:375 [inline]
 __kasan_kmalloc+0x8e/0xa0 mm/kasan/common.c:384
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slab_common.c:936 [inline]
 __kmalloc_node_track_caller+0xb0/0x240 mm/slab_common.c:956
 kmemdup+0x27/0x60 mm/util.c:129
 kmemdup include/linux/fortify-string.h:585 [inline]
 platform_device_add_data+0x2a/0xa0 drivers/base/platform.c:638
 dummy_hcd_init+0x766/0x1167 drivers/usb/gadget/udc/dummy_hcd.c:2848
 do_one_initcall+0x257/0x800 init/main.c:1309
 do_initcall_level+0x13d/0x1ed init/main.c:1382
 do_initcalls+0x4b/0x8a init/main.c:1398
 kernel_init_freeable+0x401/0x5ab init/main.c:1637
 kernel_init+0x19/0x1b0 init/main.c:1525
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

The buggy address belongs to the object at ffff888024d73ca8
 which belongs to the cache kmalloc-8 of size 8
The buggy address is located 12 bytes to the right of
 8-byte region [ffff888024d73ca8, ffff888024d73cb0)

The buggy address belongs to the physical page:
page:ffffea0000935cc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x24d73
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 0000000000000000 dead000000000001 ffff888017441280
raw: 0000000000000000 0000000000660066 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 1, tgid 1 (swapper/0), ts 8299956847, free_ts 8298990318
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2560
 prep_new_page mm/page_alloc.c:2567 [inline]
 get_page_from_freelist+0x206b/0x2180 mm/page_alloc.c:4358
 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5658
 alloc_page_interleave+0x24/0x1e0 mm/mempolicy.c:2115
 alloc_slab_page+0x5d/0x180 mm/slub.c:1799
 allocate_slab mm/slub.c:1944 [inline]
 new_slab+0x87/0x2d0 mm/slub.c:1997
 ___slab_alloc+0xbc5/0x1240 mm/slub.c:3154
 __slab_alloc mm/slub.c:3240 [inline]
 slab_alloc_node mm/slub.c:3325 [inline]
 __kmem_cache_alloc_node+0x126/0x270 mm/slub.c:3398
 __do_kmalloc_node mm/slab_common.c:935 [inline]
 __kmalloc_node_track_caller+0xa0/0x240 mm/slab_common.c:956
 kstrdup mm/util.c:61 [inline]
 kstrdup_const+0x56/0x90 mm/util.c:84
 __kernfs_new_node+0xa6/0x7f0 fs/kernfs/dir.c:610
 kernfs_new_node+0x148/0x250 fs/kernfs/dir.c:690
 kernfs_create_link+0xa3/0x200 fs/kernfs/symlink.c:39
 sysfs_do_create_link_sd+0x83/0x110 fs/sysfs/symlink.c:44
 device_add_class_symlinks drivers/base/core.c:3439 [inline]
 device_add+0x83b/0x1050 drivers/base/core.c:3645
 device_add_disk+0x417/0xf70 block/genhd.c:470
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1487 [inline]
 free_pcp_prepare mm/page_alloc.c:1537 [inline]
 free_unref_page_prepare+0x8e5/0x9e0 mm/page_alloc.c:3414
 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3509
 mm_free_pgd kernel/fork.c:748 [inline]
 __mmdrop+0xb0/0x480 kernel/fork.c:799
 free_bprm+0x122/0x2d0 fs/exec.c:1515
 kernel_execve+0x3e5/0x980 fs/exec.c:2041
 call_usermodehelper_exec_async+0x207/0x350 kernel/umh.c:113
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

Memory state around the buggy address:
 ffff888024d73b80: fc fc 05 fc fc fc fc 05 fc fc fc fc 05 fc fc fc
 ffff888024d73c00: fc 04 fc fc fc fc 00 fc fc fc fc 00 fc fc fc fc
>ffff888024d73c80: 00 fc fc fc fc 00 fc fc fc fc 00 fc fc fc fc 00
                                        ^
 ffff888024d73d00: fc fc fc fc 00 fc fc fc fc 00 fc fc fc fc 00 fc
 ffff888024d73d80: fc fc fc 00 fc fc fc fc 00 fc fc fc fc 00 fc fc
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