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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 ffffc9000a2e78f8 by task syz-executor.0/8357

CPU: 1 PID: 8357 Comm: syz-executor.0 Not tainted 6.4.0-rc5-syzkaller-01229-g97c5209b3d37 #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:351
 print_report mm/kasan/report.c:462 [inline]
 kasan_report+0x11c/0x130 mm/kasan/report.c:572
 skb_splice_from_iter+0xcd6/0xd70 net/core/skbuff.c:6793
 __ip_append_data+0x1439/0x3c20 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:724 [inline]
 sock_sendmsg+0xde/0x190 net/socket.c:747
 splice_to_socket+0x954/0xe30 fs/splice.c:917
 do_splice_from fs/splice.c:969 [inline]
 do_splice+0xb8c/0x1e50 fs/splice.c:1309
 __do_splice+0x14e/0x270 fs/splice.c:1387
 __do_sys_splice fs/splice.c:1598 [inline]
 __se_sys_splice fs/splice.c:1580 [inline]
 __x64_sys_splice+0x19c/0x250 fs/splice.c:1580
 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: 0033:0x7f188ca8c389
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:00007f188d856168 EFLAGS: 00000246 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 00007f188cbabf80 RCX: 00007f188ca8c389
RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007f188cad7493 R08: 0000000000007fff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe5726d47f R14: 00007f188d856300 R15: 0000000000022000
 </TASK>

The buggy address belongs to stack of task syz-executor.0/8357
 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
 [ffffc9000a2e0000, ffffc9000a2e9000) created by:
 kernel_clone+0xeb/0x890 kernel/fork.c:2915

The buggy address belongs to the physical page:
page:ffffea0002239880 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x88e62
memcg:ffff888078350d82
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff ffff888078350d82
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 8349, tgid 8349 (syz-executor.1), ts 2455774930681, free_ts 2455522495295
 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
 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2279
 vm_area_alloc_pages mm/vmalloc.c:3009 [inline]
 __vmalloc_area_node mm/vmalloc.c:3085 [inline]
 __vmalloc_node_range+0xb1c/0x14a0 mm/vmalloc.c:3257
 alloc_thread_stack_node kernel/fork.c:313 [inline]
 dup_task_struct kernel/fork.c:1116 [inline]
 copy_process+0x13bb/0x75c0 kernel/fork.c:2333
 kernel_clone+0xeb/0x890 kernel/fork.c:2915
 __do_sys_clone+0xba/0x100 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+0x33/0x370 mm/page_alloc.c:2659
 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2636
 qlink_free mm/kasan/quarantine.c:166 [inline]
 qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:185
 kasan_quarantine_reduce+0x195/0x220 mm/kasan/quarantine.c:292
 __kasan_slab_alloc+0x63/0x90 mm/kasan/common.c:305
 kasan_slab_alloc include/linux/kasan.h:186 [inline]
 slab_post_alloc_hook mm/slab.h:711 [inline]
 slab_alloc_node mm/slub.c:3451 [inline]
 slab_alloc mm/slub.c:3459 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3466 [inline]
 kmem_cache_alloc+0x17c/0x3b0 mm/slub.c:3475
 getname_flags.part.0+0x50/0x4f0 fs/namei.c:140
 getname_flags include/linux/audit.h:321 [inline]
 getname+0x92/0xd0 fs/namei.c:219
 do_sys_openat2+0xf5/0x4c0 fs/open.c:1350
 do_sys_open fs/open.c:1372 [inline]
 __do_sys_openat fs/open.c:1388 [inline]
 __se_sys_openat fs/open.c:1383 [inline]
 __x64_sys_openat+0x143/0x1f0 fs/open.c:1383
 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:
 ffffc9000a2e7780: f1 f1 04 f2 00 00 00 f2 f2 f2 00 00 00 00 00 f2
 ffffc9000a2e7800: f2 f2 f2 f2 00 00 00 00 00 00 f2 f2 f2 f2 00 00
>ffffc9000a2e7880: 00 00 00 00 00 00 f2 f2 f2 f2 00 00 00 f2 f2 f2
                                                                ^
 ffffc9000a2e7900: f2 f2 00 00 00 00 00 00 00 00 00 f3 f3 f3 f3 f3
 ffffc9000a2e7980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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