==================================================================
BUG: KASAN: slab-out-of-bounds in iov_iter_revert+0x1c1/0x590 lib/iov_iter.c:633
Read of size 4 at addr ffff88807e41e618 by task kworker/u8:3/53

CPU: 1 UID: 0 PID: 53 Comm: kworker/u8:3 Not tainted 6.14.0-rc6-syzkaller-00205-g3571e8b091f4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: events_unbound netfs_write_collection_worker
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:408 [inline]
 print_report+0x16e/0x5b0 mm/kasan/report.c:521
 kasan_report+0x143/0x180 mm/kasan/report.c:634
 iov_iter_revert+0x1c1/0x590 lib/iov_iter.c:633
 netfs_retry_write_stream fs/netfs/write_retry.c:44 [inline]
 netfs_retry_writes+0x17db/0x19b0 fs/netfs/write_retry.c:231
 netfs_collect_write_results fs/netfs/write_collect.c:352 [inline]
 netfs_write_collection_worker+0x2f90/0x3bb0 fs/netfs/write_collect.c:374
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xac0/0x18e0 kernel/workqueue.c:3319
 worker_thread+0x870/0xd30 kernel/workqueue.c:3400
 kthread+0x7ab/0x920 kernel/kthread.c:464
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

Allocated by task 5837:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
 __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394
 kasan_kmalloc include/linux/kasan.h:260 [inline]
 __do_kmalloc_node mm/slub.c:4294 [inline]
 __kmalloc_noprof+0x285/0x4c0 mm/slub.c:4306
 kmalloc_noprof include/linux/slab.h:905 [inline]
 kzalloc_noprof include/linux/slab.h:1037 [inline]
 lsm_blob_alloc security/security.c:684 [inline]
 lsm_sock_alloc security/security.c:4839 [inline]
 security_sk_alloc+0x53/0x360 security/security.c:4855
 sk_prot_alloc+0xfa/0x210 net/core/sock.c:2184
 sk_alloc+0x3e/0x370 net/core/sock.c:2234
 inet_create+0x648/0xea0 net/ipv4/af_inet.c:326
 __sock_create+0x4c2/0xa30 net/socket.c:1548
 sock_create net/socket.c:1606 [inline]
 __sys_socket_create net/socket.c:1643 [inline]
 __sys_socket+0x150/0x3c0 net/socket.c:1690
 __do_sys_socket net/socket.c:1704 [inline]
 __se_sys_socket net/socket.c:1702 [inline]
 __x64_sys_socket+0x7a/0x90 net/socket.c:1702
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 5837:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:576
 poison_slab_object mm/kasan/common.c:247 [inline]
 __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264
 kasan_slab_free include/linux/kasan.h:233 [inline]
 slab_free_hook mm/slub.c:2353 [inline]
 slab_free mm/slub.c:4609 [inline]
 kfree+0x196/0x430 mm/slub.c:4757
 security_sk_free+0xa4/0x1a0 security/security.c:4874
 sk_prot_free net/core/sock.c:2213 [inline]
 __sk_destruct+0x4e8/0x690 net/core/sock.c:2312
 inet_release+0x17f/0x200 net/ipv4/af_inet.c:435
 __sock_release net/socket.c:647 [inline]
 sock_close+0xbe/0x240 net/socket.c:1398
 __fput+0x3eb/0x9f0 fs/file_table.c:464
 __do_sys_close fs/open.c:1580 [inline]
 __se_sys_close fs/open.c:1565 [inline]
 __x64_sys_close+0x7f/0x110 fs/open.c:1565
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88807e41e600
 which belongs to the cache kmalloc-16 of size 16
The buggy address is located 8 bytes to the right of
 allocated 16-byte region [ffff88807e41e600, ffff88807e41e610)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7e41e
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801b041640 ffffea00008ae2c0 dead000000000002
raw: 0000000000000000 0000000080800080 00000000f5000000 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 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5838, tgid 5838 (syz-executor), ts 83674334440, free_ts 83674110949
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1551
 prep_new_page mm/page_alloc.c:1559 [inline]
 get_page_from_freelist+0x365c/0x37a0 mm/page_alloc.c:3477
 __alloc_frozen_pages_noprof+0x292/0x710 mm/page_alloc.c:4740
 alloc_pages_mpol+0x311/0x660 mm/mempolicy.c:2270
 alloc_slab_page mm/slub.c:2423 [inline]
 allocate_slab+0x8f/0x3a0 mm/slub.c:2587
 new_slab mm/slub.c:2640 [inline]
 ___slab_alloc+0xc27/0x14a0 mm/slub.c:3826
 __slab_alloc+0x58/0xa0 mm/slub.c:3916
 __slab_alloc_node mm/slub.c:3991 [inline]
 slab_alloc_node mm/slub.c:4152 [inline]
 __do_kmalloc_node mm/slub.c:4293 [inline]
 __kmalloc_noprof+0x2e6/0x4c0 mm/slub.c:4306
 kmalloc_noprof include/linux/slab.h:905 [inline]
 kzalloc_noprof include/linux/slab.h:1037 [inline]
 xt_jumpstack_alloc net/netfilter/x_tables.c:1335 [inline]
 xt_replace_table+0x91/0x780 net/netfilter/x_tables.c:1394
 xt_register_table+0x293/0x750 net/netfilter/x_tables.c:1480
 ipt_register_table+0x163/0x740 net/ipv4/netfilter/ip_tables.c:1748
 iptable_nat_table_init+0x43/0x2d0 net/ipv4/netfilter/iptable_nat.c:115
 xt_find_table_lock+0x324/0x400 net/netfilter/x_tables.c:1260
 xt_request_find_table_lock+0x26/0x100 net/netfilter/x_tables.c:1285
 get_info net/ipv4/netfilter/ip_tables.c:963 [inline]
 do_ipt_get_ctl+0x890/0x18b0 net/ipv4/netfilter/ip_tables.c:1659
 nf_getsockopt+0x29b/0x2c0 net/netfilter/nf_sockopt.c:116
page last free pid 5838 tgid 5838 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1127 [inline]
 free_frozen_pages+0xe0d/0x10e0 mm/page_alloc.c:2660
 vfree+0x1c3/0x360 mm/vmalloc.c:3383
 copy_entries_to_user net/ipv4/netfilter/ip_tables.c:866 [inline]
 get_entries net/ipv4/netfilter/ip_tables.c:1022 [inline]
 do_ipt_get_ctl+0x1238/0x18b0 net/ipv4/netfilter/ip_tables.c:1668
 nf_getsockopt+0x29b/0x2c0 net/netfilter/nf_sockopt.c:116
 ip_getsockopt+0x222/0x2e0 net/ipv4/ip_sockglue.c:1777
 tcp_getsockopt+0x165/0x1c0 net/ipv4/tcp.c:4684
 do_sock_getsockopt+0x390/0x740 net/socket.c:2364
 __sys_getsockopt net/socket.c:2393 [inline]
 __do_sys_getsockopt net/socket.c:2400 [inline]
 __se_sys_getsockopt net/socket.c:2397 [inline]
 __x64_sys_getsockopt+0x2a1/0x370 net/socket.c:2397
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88807e41e500: fa fb fc fc 00 00 fc fc fa fb fc fc 00 00 fc fc
 ffff88807e41e580: fa fb fc fc 00 00 fc fc fa fb fc fc 00 00 fc fc
>ffff88807e41e600: fa fb fc fc 00 00 fc fc 00 00 fc fc fa fb fc fc
                            ^
 ffff88807e41e680: 00 00 fc fc fa fb fc fc 00 00 fc fc 00 00 fc fc
 ffff88807e41e700: 00 00 fc fc 00 00 fc fc 00 00 fc fc 00 00 fc fc
==================================================================