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BUG: KASAN: slab-out-of-bounds in _copy_to_iter+0xb56/0xfa0 lib/iov_iter.c:527
Write of size 22 at addr ffff88801eff82c7 by task kworker/1:2/142

CPU: 1 PID: 142 Comm: kworker/1:2 Not tainted 6.1.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Workqueue: events p9_read_work
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x57/0x7d lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:284 [inline]
 print_report+0x15e/0x461 mm/kasan/report.c:395
 kasan_report+0xbb/0x1f0 mm/kasan/report.c:495
 check_region_inline mm/kasan/generic.c:183 [inline]
 kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189
 memcpy+0x39/0x60 mm/kasan/shadow.c:66
 _copy_to_iter+0xb56/0xfa0 lib/iov_iter.c:527
 copy_page_to_iter+0xa5/0x8e0 lib/iov_iter.c:725
 pipe_read+0x440/0xe20 fs/pipe.c:307
 __kernel_read+0x27c/0x6d0 fs/read_write.c:428
 p9_fd_read net/9p/trans_fd.c:266 [inline]
 p9_read_work+0x25b/0x1280 net/9p/trans_fd.c:301
 process_one_work+0x8ba/0x14b0 kernel/workqueue.c:2289
 worker_thread+0x598/0xec0 kernel/workqueue.c:2436
 kthread+0x294/0x330 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>

Allocated by task 4152:
 kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45
 kasan_set_track+0x21/0x30 mm/kasan/common.c:52
 ____kasan_kmalloc mm/kasan/common.c:371 [inline]
 ____kasan_kmalloc mm/kasan/common.c:330 [inline]
 __kasan_kmalloc+0x9f/0xb0 mm/kasan/common.c:380
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slab_common.c:955 [inline]
 __kmalloc+0x54/0xc0 mm/slab_common.c:968
 kmalloc include/linux/slab.h:581 [inline]
 p9_fcall_init+0x79/0x200 net/9p/client.c:228
 p9_tag_alloc+0x1b4/0x710 net/9p/client.c:293
 p9_client_prepare_req+0xde/0x480 net/9p/client.c:631
 p9_client_rpc+0x168/0x9d0 net/9p/client.c:678
 p9_client_walk+0x17f/0x420 net/9p/client.c:1152
 v9fs_vfs_lookup.part.0+0x12a/0x440 fs/9p/vfs_inode.c:777
 __lookup_hash+0xe1/0x140 fs/namei.c:1601
 filename_create+0x18c/0x3c0 fs/namei.c:3807
 do_mkdirat+0x8d/0x280 fs/namei.c:4050
 __do_sys_mkdir fs/namei.c:4080 [inline]
 __se_sys_mkdir fs/namei.c:4078 [inline]
 __x64_sys_mkdir+0xd0/0x120 fs/namei.c:4078
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff88801eff82c0
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 7 bytes inside of
 32-byte region [ffff88801eff82c0, ffff88801eff82e0)

The buggy address belongs to the physical page:
page:ffffea00007bfe00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88801eff8fc1 pfn:0x1eff8
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffffea0000584708 ffff888010c41250 ffff888010c40100
raw: ffff88801eff8fc1 ffff88801eff8000 000000010000003f 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 0x2420c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_COMP|__GFP_THISNODE), pid 1, tgid 1 (swapper/0), ts 5846908935, free_ts 0
 prep_new_page mm/page_alloc.c:2539 [inline]
 get_page_from_freelist+0x10b5/0x2d50 mm/page_alloc.c:4288
 __alloc_pages+0x1c7/0x5a0 mm/page_alloc.c:5555
 __alloc_pages_node include/linux/gfp.h:223 [inline]
 kmem_getpages mm/slab.c:1363 [inline]
 cache_grow_begin+0x75/0x360 mm/slab.c:2570
 cache_alloc_refill+0x27f/0x380 mm/slab.c:2943
 ____cache_alloc mm/slab.c:3019 [inline]
 ____cache_alloc mm/slab.c:3002 [inline]
 __do_cache_alloc mm/slab.c:3202 [inline]
 slab_alloc_node mm/slab.c:3250 [inline]
 __kmem_cache_alloc_node+0x442/0x500 mm/slab.c:3549
 __do_kmalloc_node mm/slab_common.c:954 [inline]
 __kmalloc_node_track_caller+0x45/0xc0 mm/slab_common.c:975
 kstrdup+0x2e/0x60 mm/util.c:61
 __kernfs_new_node+0x94/0x7b0 fs/kernfs/dir.c:599
 kernfs_new_node fs/kernfs/dir.c:665 [inline]
 kernfs_create_dir_ns+0x80/0x220 fs/kernfs/dir.c:1011
 sysfs_create_dir_ns+0x116/0x260 fs/sysfs/dir.c:59
 create_dir lib/kobject.c:63 [inline]
 kobject_add_internal+0x272/0x7d0 lib/kobject.c:223
 kobject_add_varg lib/kobject.c:358 [inline]
 kobject_add+0x120/0x190 lib/kobject.c:410
 blk_mq_register_hctx+0xfe/0x2a0 block/blk-mq-sysfs.c:193
 blk_mq_sysfs_register+0x1d6/0x500 block/blk-mq-sysfs.c:254
 blk_register_queue+0xcd/0x3c0 block/blk-sysfs.c:821
 device_add_disk+0x67a/0xdc0 block/genhd.c:486
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88801eff8180: 00 00 01 fc fc fc fc fc 00 04 fc fc fc fc fc fc
 ffff88801eff8200: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
>ffff88801eff8280: 00 06 fc fc fc fc fc fc 00 00 06 fc fc fc fc fc
                                                 ^
 ffff88801eff8300: 05 fc fc fc fc fc fc fc 05 fc fc fc fc fc fc fc
 ffff88801eff8380: 05 fc fc fc fc fc fc fc 00 00 00 00 fc fc fc fc
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