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BUG: KASAN: stack-out-of-bounds in skb_splice_from_iter+0xcd6/0xd70 net/core/skbuff.c:6793
Read of size 8 at addr ffffc900056c78f8 by task syz-executor.4/14678

CPU: 0 PID: 14678 Comm: syz-executor.4 Not tainted 6.4.0-rc6-next-20230616-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:364
 print_report mm/kasan/report.c:475 [inline]
 kasan_report+0x11d/0x130 mm/kasan/report.c:588
 skb_splice_from_iter+0xcd6/0xd70 net/core/skbuff.c:6793
 __ip_append_data+0x144f/0x3c80 net/ipv4/ip_output.c:1211
 ip_append_data net/ipv4/ip_output.c:1351 [inline]
 ip_append_data+0x115/0x1a0 net/ipv4/ip_output.c:1330
 raw_sendmsg+0xb50/0x30a0 net/ipv4/raw.c:641
 inet_sendmsg+0x9d/0xe0 net/ipv4/af_inet.c:830
 sock_sendmsg_nosec net/socket.c:725 [inline]
 sock_sendmsg+0xde/0x190 net/socket.c:748
 splice_to_socket+0x954/0xe30 fs/splice.c:885
 do_splice_from fs/splice.c:937 [inline]
 do_splice+0xb8a/0x1f30 fs/splice.c:1298
 __do_splice+0x14e/0x270 fs/splice.c:1376
 __do_sys_splice fs/splice.c:1587 [inline]
 __se_sys_splice fs/splice.c:1569 [inline]
 __x64_sys_splice+0x19c/0x250 fs/splice.c:1569
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f8ae548c389
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8ae613a168 EFLAGS: 00000246 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 00007f8ae55ac050 RCX: 00007f8ae548c389
RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007f8ae54d7493 R08: 0000000000008004 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffce077de3f R14: 00007f8ae613a300 R15: 0000000000022000
 </TASK>

The buggy address belongs to stack of task syz-executor.4/14678
 and is located at offset 408 in frame:
 raw_sendmsg+0x0/0x30a0 include/net/sock.h:2733

This frame has 8 objects:
 [48, 52) 'hdrincl'
 [64, 68) 'err'
 [80, 88) 'rt'
 [112, 152) 'ipc'
 [192, 240) 'state'
 [272, 336) 'fl4'
 [368, 392) 'rfv'
 [432, 504) 'opt_copy'

The buggy address belongs to the virtual mapping at
 [ffffc900056c0000, ffffc900056c9000) created by:
 kernel_clone+0xeb/0x890 kernel/fork.c:2911

The buggy address belongs to the physical page:
page:ffffea0001ec6640 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7b199
memcg:ffff88804ca87802
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff ffff88804ca87802
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 5072, tgid 5072 (syz-executor.2), ts 1092642730711, free_ts 1070530536022
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x2db/0x350 mm/page_alloc.c:1570
 prep_new_page mm/page_alloc.c:1577 [inline]
 get_page_from_freelist+0xfc2/0x2b00 mm/page_alloc.c:3257
 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4513
 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2279
 vm_area_alloc_pages mm/vmalloc.c:3059 [inline]
 __vmalloc_area_node mm/vmalloc.c:3135 [inline]
 __vmalloc_node_range+0xb73/0x14b0 mm/vmalloc.c:3316
 alloc_thread_stack_node kernel/fork.c:309 [inline]
 dup_task_struct kernel/fork.c:1112 [inline]
 copy_process+0x13bb/0x75c0 kernel/fork.c:2329
 kernel_clone+0xeb/0x890 kernel/fork.c:2911
 __do_sys_clone+0xba/0x100 kernel/fork.c:3054
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1161 [inline]
 free_unref_page_prepare+0x4dd/0xb90 mm/page_alloc.c:2384
 free_unref_page+0x33/0x370 mm/page_alloc.c:2479
 kasan_depopulate_vmalloc_pte+0x62/0x80 mm/kasan/shadow.c:427
 apply_to_pte_range mm/memory.c:2597 [inline]
 apply_to_pmd_range mm/memory.c:2641 [inline]
 apply_to_pud_range mm/memory.c:2677 [inline]
 apply_to_p4d_range mm/memory.c:2713 [inline]
 __apply_to_page_range+0x5d2/0xe00 mm/memory.c:2747
 kasan_release_vmalloc+0xab/0xc0 mm/kasan/shadow.c:544
 __purge_vmap_area_lazy+0x886/0x1e60 mm/vmalloc.c:1770
 drain_vmap_area_work+0x54/0xd0 mm/vmalloc.c:1804
 process_one_work+0xa34/0x16f0 kernel/workqueue.c:2594
 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2745
 kthread+0x344/0x440 kernel/kthread.c:379
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

Memory state around the buggy address:
 ffffc900056c7780: f1 f1 04 f2 00 00 00 f2 f2 f2 00 00 00 00 00 f2
 ffffc900056c7800: f2 f2 f2 f2 00 00 00 00 00 00 f2 f2 f2 f2 00 00
>ffffc900056c7880: 00 00 00 00 00 00 f2 f2 f2 f2 00 00 00 f2 f2 f2
                                                                ^
 ffffc900056c7900: f2 f2 00 00 00 00 00 00 00 00 00 f3 f3 f3 f3 f3
 ffffc900056c7980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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