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BUG: KASAN: use-after-free in do_csum+0x2db/0x2e0 lib/checksum.c:73
Read of size 4 at addr ffff888042690000 by task syz-executor.4/20382

CPU: 1 PID: 20382 Comm: syz-executor.4 Not tainted 6.1.0-syzkaller-04286-gbe1236fce5f4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:306 [inline]
 print_report+0x15e/0x45d mm/kasan/report.c:417
 kasan_report+0xbf/0x1f0 mm/kasan/report.c:517
 do_csum+0x2db/0x2e0 lib/checksum.c:73
 csum_partial+0x24/0x60 lib/checksum.c:128
 __skb_checksum+0x4b6/0x890 net/core/skbuff.c:3094
 skb_checksum net/core/skbuff.c:3146 [inline]
 __skb_checksum_complete+0xaf/0x3e0 net/core/skbuff.c:3268
 __skb_checksum_validate_complete include/linux/skbuff.h:4436 [inline]
 icmp_rcv+0x55f/0x1030 net/ipv4/icmp.c:1205
 ip_protocol_deliver_rcu+0x9f/0x460 net/ipv4/ip_input.c:205
 ip_local_deliver_finish+0x2ec/0x4c0 net/ipv4/ip_input.c:233
 NF_HOOK include/linux/netfilter.h:302 [inline]
 NF_HOOK include/linux/netfilter.h:296 [inline]
 ip_local_deliver+0x1ae/0x200 net/ipv4/ip_input.c:254
 dst_input include/net/dst.h:454 [inline]
 ip_rcv_finish+0x1cf/0x2f0 net/ipv4/ip_input.c:449
 NF_HOOK include/linux/netfilter.h:302 [inline]
 NF_HOOK include/linux/netfilter.h:296 [inline]
 ip_rcv+0xae/0xd0 net/ipv4/ip_input.c:569
 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5482
 __netif_receive_skb+0x1f/0x1c0 net/core/dev.c:5596
 process_backlog+0x3e4/0x810 net/core/dev.c:5924
 __napi_poll+0xb8/0x770 net/core/dev.c:6485
 napi_poll net/core/dev.c:6552 [inline]
 net_rx_action+0xa00/0xde0 net/core/dev.c:6663
 __do_softirq+0x1fb/0xadc kernel/softirq.c:571
 do_softirq.part.0+0xde/0x130 kernel/softirq.c:472
 </IRQ>
 <TASK>
 do_softirq kernel/softirq.c:464 [inline]
 __local_bh_enable_ip+0x106/0x130 kernel/softirq.c:396
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:834 [inline]
 ip_finish_output2+0x7dc/0x2180 net/ipv4/ip_output.c:229
 __ip_finish_output net/ipv4/ip_output.c:306 [inline]
 __ip_finish_output+0x396/0x650 net/ipv4/ip_output.c:288
 ip_finish_output+0x31/0x280 net/ipv4/ip_output.c:316
 NF_HOOK_COND include/linux/netfilter.h:291 [inline]
 ip_output+0x1a3/0x320 net/ipv4/ip_output.c:430
 dst_output include/net/dst.h:444 [inline]
 ip_local_out net/ipv4/ip_output.c:126 [inline]
 ip_send_skb net/ipv4/ip_output.c:1586 [inline]
 ip_push_pending_frames+0x129/0x2b0 net/ipv4/ip_output.c:1606
 ping_v4_push_pending_frames net/ipv4/ping.c:657 [inline]
 ping_v4_sendmsg+0xef6/0x1790 net/ipv4/ping.c:843
 inet_sendmsg+0x9d/0xe0 net/ipv4/af_inet.c:827
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg+0xd3/0x120 net/socket.c:734
 ____sys_sendmsg+0x712/0x8c0 net/socket.c:2476
 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2530
 __sys_sendmsg+0xf7/0x1c0 net/socket.c:2559
 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: 0033:0x7f665a88c0a9
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:00007f665b65c168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f665a9abf80 RCX: 00007f665a88c0a9
RDX: 0000000000000000 RSI: 0000000020001280 RDI: 0000000000000003
RBP: 00007f665a8e7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff85bbd26f R14: 00007f665b65c300 R15: 0000000000022000
 </TASK>

The buggy address belongs to the physical page:
page:ffffea000109a400 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x42690
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea0000ac3a08 ffff8880b9942260 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1528c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 20382, tgid 20381 (syz-executor.4), ts 1739515046266, free_ts 1739516413129
 prep_new_page mm/page_alloc.c:2531 [inline]
 get_page_from_freelist+0x119c/0x2ce0 mm/page_alloc.c:4283
 __alloc_pages+0x1cb/0x5b0 mm/page_alloc.c:5549
 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2285
 skb_page_frag_refill net/core/sock.c:2865 [inline]
 skb_page_frag_refill+0x195/0x360 net/core/sock.c:2849
 sk_page_frag_refill+0x58/0x300 net/core/sock.c:2885
 __ip_append_data+0x9c1/0x39f0 net/ipv4/ip_output.c:1213
 ip_append_data net/ipv4/ip_output.c:1343 [inline]
 ip_append_data+0x115/0x1a0 net/ipv4/ip_output.c:1322
 ping_v4_sendmsg+0xaac/0x1790 net/ipv4/ping.c:837
 inet_sendmsg+0x9d/0xe0 net/ipv4/af_inet.c:827
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg+0xd3/0x120 net/socket.c:734
 ____sys_sendmsg+0x712/0x8c0 net/socket.c:2476
 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2530
 __sys_sendmsg+0xf7/0x1c0 net/socket.c:2559
 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:
 create_dummy_stack mm/page_owner.c:67 [inline]
 register_dummy_stack+0x65/0xa4 mm/page_owner.c:73
 init_page_owner+0x4c/0x636 mm/page_owner.c:91
 invoke_init_callbacks mm/page_ext.c:126 [inline]
 page_ext_init+0x4c2/0x4d5 mm/page_ext.c:518
 kernel_init_freeable+0x4c4/0x782 init/main.c:1632

Memory state around the buggy address:
 ffff88804268ff00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff88804268ff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888042690000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                   ^
 ffff888042690080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888042690100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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