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BUG: KASAN: stack-out-of-bounds in skb_splice_from_iter+0x919/0x9d0 net/core/skbuff.c:6933
Read of size 8 at addr ffffc900049ef930 by task syz-executor.0/5444

CPU: 1 PID: 5444 Comm: syz-executor.0 Not tainted 6.4.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x64/0xb0 lib/dump_stack.c:106
 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:351
 print_report mm/kasan/report.c:462 [inline]
 kasan_report+0x11c/0x130 mm/kasan/report.c:572
 skb_splice_from_iter+0x919/0x9d0 net/core/skbuff.c:6933
 __ip_append_data+0xf53/0x3560 net/ipv4/ip_output.c:1210
 ip_append_data net/ipv4/ip_output.c:1350 [inline]
 ip_append_data+0xc2/0x170 net/ipv4/ip_output.c:1329
 raw_sendmsg+0x8b9/0x2950 net/ipv4/raw.c:641
 sock_sendmsg_nosec net/socket.c:722 [inline]
 sock_sendmsg+0xc0/0x150 net/socket.c:745
 splice_to_socket+0x738/0xd70 fs/splice.c:917
 do_splice_from fs/splice.c:969 [inline]
 do_splice+0x9e1/0x1f00 fs/splice.c:1278
 __do_splice+0x117/0x1f0 fs/splice.c:1356
 __do_sys_splice fs/splice.c:1567 [inline]
 __se_sys_splice fs/splice.c:1549 [inline]
 __x64_sys_splice+0x14e/0x200 fs/splice.c:1549
 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: 0033:0x7f7deb28c169
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:00007f7debf57168 EFLAGS: 00000246 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 00007f7deb3abf80 RCX: 00007f7deb28c169
RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007f7deb2e7ca1 R08: 000000000004ffdd R09: 000000000000000d
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffda84dd78f R14: 00007f7debf57300 R15: 0000000000022000
 </TASK>

The buggy address belongs to stack of task syz-executor.0/5444
 and is located at offset 408 in frame:
 raw_sendmsg+0x0/0x2950 include/net/sock.h:2732

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
 [ffffc900049e8000, ffffc900049f1000) created by:
 kernel_clone+0xbc/0x640 kernel/fork.c:2915

The buggy address belongs to the physical page:
page:ffffea0001dc9b80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7726e
memcg:ffff888028a0b002
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff ffff888028a0b002
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 5425, tgid 5425 (dhcpcd-run-hook), ts 71002012495, free_ts 71000533390
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x2db/0x350 mm/page_alloc.c:1731
 prep_new_page mm/page_alloc.c:1738 [inline]
 get_page_from_freelist+0xf41/0x2c00 mm/page_alloc.c:3502
 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4768
 vm_area_alloc_pages mm/vmalloc.c:3009 [inline]
 __vmalloc_area_node mm/vmalloc.c:3085 [inline]
 __vmalloc_node_range+0x7ff/0x1070 mm/vmalloc.c:3257
 alloc_thread_stack_node kernel/fork.c:313 [inline]
 dup_task_struct kernel/fork.c:1116 [inline]
 copy_process+0x1181/0x6bf0 kernel/fork.c:2333
 kernel_clone+0xbc/0x640 kernel/fork.c:2915
 __do_sys_clone+0xa1/0xe0 kernel/fork.c:3058
 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:1302 [inline]
 free_unref_page_prepare+0x62e/0xcb0 mm/page_alloc.c:2564
 free_unref_page_list+0xe3/0xa70 mm/page_alloc.c:2705
 release_pages+0x321/0x10e0 mm/swap.c:1042
 tlb_batch_pages_flush+0x85/0x160 mm/mmu_gather.c:97
 tlb_flush_mmu_free mm/mmu_gather.c:292 [inline]
 tlb_flush_mmu mm/mmu_gather.c:299 [inline]
 tlb_finish_mmu+0x114/0x6c0 mm/mmu_gather.c:391
 exit_mmap+0x23d/0x750 mm/mmap.c:3123
 __mmput+0xf3/0x440 kernel/fork.c:1351
 exit_mm kernel/exit.c:567 [inline]
 do_exit+0x85d/0x24d0 kernel/exit.c:861
 do_group_exit+0xb4/0x250 kernel/exit.c:1024
 __do_sys_exit_group kernel/exit.c:1035 [inline]
 __se_sys_exit_group kernel/exit.c:1033 [inline]
 __x64_sys_exit_group+0x39/0x40 kernel/exit.c:1033
 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

Memory state around the buggy address:
 ffffc900049ef800: f2 00 00 00 00 00 f2 f2 f2 f2 f2 00 00 00 00 00
 ffffc900049ef880: 00 f2 f2 f2 f2 00 00 00 00 00 00 00 00 f2 f2 f2
>ffffc900049ef900: f2 00 00 00 f2 f2 f2 f2 f2 00 00 00 00 00 00 00
                                     ^
 ffffc900049ef980: 00 00 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00 00
 ffffc900049efa00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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