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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 ffffc9000cedf740 by task syz-executor.1/7860

CPU: 1 PID: 7860 Comm: syz-executor.1 Not tainted 6.4.0-rc5-syzkaller-01219-gfa0e21fa4443 #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
 ping_v4_sendmsg+0xafb/0x18a0 net/ipv4/ping.c:822
 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]
 direct_splice_actor+0x114/0x180 fs/splice.c:1157
 splice_direct_to_actor+0x34a/0x9c0 fs/splice.c:1103
 do_splice_direct+0x1ad/0x280 fs/splice.c:1209
 do_sendfile+0xb19/0x12c0 fs/read_write.c:1254
 __do_sys_sendfile64 fs/read_write.c:1322 [inline]
 __se_sys_sendfile64 fs/read_write.c:1308 [inline]
 __x64_sys_sendfile64+0x1d0/0x210 fs/read_write.c:1308
 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: 0033:0x7f8c20a8c149
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:00007f8c21826168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f8c20bac050 RCX: 00007f8c20a8c149
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000003
RBP: 00007f8c20ae7cad R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000001003 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe861edf5f R14: 00007f8c21826300 R15: 0000000000022000
 </TASK>

The buggy address belongs to stack of task syz-executor.1/7860
 and is located at offset 312 in frame:
 ping_v4_sendmsg+0x0/0x18a0 net/ipv4/ping.c:447

This frame has 6 objects:
 [32, 40) 'rt'
 [64, 104) 'ipc'
 [144, 208) 'fl4'
 [240, 248) 'user_icmph'
 [272, 296) 'pfh'
 [336, 408) 'opt_copy'

The buggy address belongs to the virtual mapping at
 [ffffc9000ced8000, ffffc9000cee1000) created by:
 kernel_clone+0xeb/0x890 kernel/fork.c:2915

The buggy address belongs to the physical page:
page:ffffea0001ccc340 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7330d
memcg:ffff88807650ba02
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff ffff88807650ba02
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 7854, tgid 7854 (syz-executor.1), ts 179212840179, free_ts 178892611996
 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_list+0xe3/0xa70 mm/page_alloc.c:2705
 release_pages+0xcd8/0x1380 mm/swap.c:1042
 tlb_batch_pages_flush+0xa8/0x1a0 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+0x14b/0x7e0 mm/mmu_gather.c:391
 exit_mmap+0x2b2/0x930 mm/mmap.c:3123
 __mmput+0x128/0x4c0 kernel/fork.c:1351
 mmput+0x60/0x70 kernel/fork.c:1373
 exit_mm kernel/exit.c:567 [inline]
 do_exit+0x9b0/0x29b0 kernel/exit.c:861
 do_group_exit+0xd4/0x2a0 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+0x3e/0x50 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:
 ffffc9000cedf600: 00 f1 f1 f1 f1 00 f2 f2 f2 00 00 00 00 00 f2 f2
 ffffc9000cedf680: f2 f2 f2 00 00 00 00 00 00 00 00 f2 f2 00 00 00
>ffffc9000cedf700: f2 f2 f2 00 00 00 f2 f2 f2 f2 f2 00 00 00 00 00
                                           ^
 ffffc9000cedf780: 00 00 00 00 f3 f3 f3 f3 f3 00 00 00 00 00 00 00
 ffffc9000cedf800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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