==================================================================
BUG: KASAN: slab-out-of-bounds in do_csum+0x2cd/0x2e0 lib/checksum.c:73
Read of size 4 at addr ffff88801ef32980 by task syz-executor.2/24871

CPU: 0 PID: 24871 Comm: syz-executor.2 Not tainted 6.5.0-rc4-syzkaller-01180-gcc97777c80fd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0xc4/0x620 mm/kasan/report.c:475
 kasan_report+0xda/0x110 mm/kasan/report.c:588
 do_csum+0x2cd/0x2e0 lib/checksum.c:73
 csum_partial+0x23/0x50 lib/checksum.c:128
 gso_make_checksum include/net/gso.h:74 [inline]
 __skb_udp_tunnel_segment net/ipv4/udp_offload.c:140 [inline]
 skb_udp_tunnel_segment+0x126d/0x2000 net/ipv4/udp_offload.c:182
 udp6_ufo_fragment+0x9f1/0xd50 net/ipv6/udp_offload.c:35
 ipv6_gso_segment+0x5c4/0x17b0 net/ipv6/ip6_offload.c:120
 skb_mac_gso_segment+0x292/0x610 net/core/gso.c:53
 __skb_gso_segment+0x339/0x710 net/core/gso.c:124
 skb_gso_segment include/net/gso.h:83 [inline]
 ip6_finish_output_gso_slowpath_drop net/ipv6/ip6_output.c:153 [inline]
 __ip6_finish_output net/ipv6/ip6_output.c:189 [inline]
 ip6_finish_output+0xf2a/0x1250 net/ipv6/ip6_output.c:207
 NF_HOOK_COND include/linux/netfilter.h:293 [inline]
 ip6_output+0x23a/0x880 net/ipv6/ip6_output.c:228
 dst_output include/net/dst.h:458 [inline]
 ip6_local_out+0xaf/0x190 net/ipv6/output_core.c:155
 ip6tunnel_xmit include/net/ip6_tunnel.h:161 [inline]
 udp_tunnel6_xmit_skb+0x741/0xbd0 net/ipv6/ip6_udp_tunnel.c:109
 geneve6_xmit_skb drivers/net/geneve.c:1071 [inline]
 geneve_xmit+0x1b98/0x4aa0 drivers/net/geneve.c:1100
 __netdev_start_xmit include/linux/netdevice.h:4889 [inline]
 netdev_start_xmit include/linux/netdevice.h:4903 [inline]
 xmit_one net/core/dev.c:3544 [inline]
 dev_hard_start_xmit+0x13d/0x6c0 net/core/dev.c:3560
 __dev_queue_xmit+0x9be/0x3d60 net/core/dev.c:4337
 dev_queue_xmit include/linux/netdevice.h:3082 [inline]
 packet_xmit+0x257/0x380 net/packet/af_packet.c:276
 packet_snd net/packet/af_packet.c:3083 [inline]
 packet_sendmsg+0x24c7/0x5550 net/packet/af_packet.c:3115
 sock_sendmsg_nosec net/socket.c:725 [inline]
 sock_sendmsg+0xd9/0x180 net/socket.c:748
 __sys_sendto+0x255/0x340 net/socket.c:2134
 __do_sys_sendto net/socket.c:2146 [inline]
 __se_sys_sendto net/socket.c:2142 [inline]
 __x64_sys_sendto+0xe0/0x1b0 net/socket.c:2142
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f8b9247cae9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8b930f70c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f8b9259bf80 RCX: 00007f8b9247cae9
RDX: 000000000000fc13 RSI: 0000000020000280 RDI: 0000000000000003
RBP: 00007f8b924c847a R08: 0000000000000000 R09: 000000000000002f
R10: 0000000000000800 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f8b9259bf80 R15: 00007ffc421c2ef8
 </TASK>

Allocated by task 24871:
 kasan_save_stack+0x33/0x50 mm/kasan/common.c:45
 kasan_set_track+0x25/0x30 mm/kasan/common.c:52
 __kasan_slab_alloc+0x81/0x90 mm/kasan/common.c:328
 kasan_slab_alloc include/linux/kasan.h:186 [inline]
 slab_post_alloc_hook mm/slab.h:762 [inline]
 slab_alloc_node mm/slub.c:3470 [inline]
 kmem_cache_alloc_node+0x185/0x3f0 mm/slub.c:3515
 kmalloc_reserve+0x167/0x270 net/core/skbuff.c:559
 __alloc_skb+0x12b/0x330 net/core/skbuff.c:644
 skb_segment+0x87c/0x3ef0 net/core/skbuff.c:4512
 __udp_gso_segment+0x1496/0x1bf0 net/ipv4/udp_offload.c:298
 udp4_ufo_fragment+0x510/0x700 net/ipv4/udp_offload.c:399
 inet_gso_segment+0x548/0x12d0 net/ipv4/af_inet.c:1398
 skb_mac_gso_segment+0x292/0x610 net/core/gso.c:53
 __skb_udp_tunnel_segment net/ipv4/udp_offload.c:87 [inline]
 skb_udp_tunnel_segment+0x8e9/0x2000 net/ipv4/udp_offload.c:182
 udp6_ufo_fragment+0x9f1/0xd50 net/ipv6/udp_offload.c:35
 ipv6_gso_segment+0x5c4/0x17b0 net/ipv6/ip6_offload.c:120
 skb_mac_gso_segment+0x292/0x610 net/core/gso.c:53
 __skb_gso_segment+0x339/0x710 net/core/gso.c:124
 skb_gso_segment include/net/gso.h:83 [inline]
 ip6_finish_output_gso_slowpath_drop net/ipv6/ip6_output.c:153 [inline]
 __ip6_finish_output net/ipv6/ip6_output.c:189 [inline]
 ip6_finish_output+0xf2a/0x1250 net/ipv6/ip6_output.c:207
 NF_HOOK_COND include/linux/netfilter.h:293 [inline]
 ip6_output+0x23a/0x880 net/ipv6/ip6_output.c:228
 dst_output include/net/dst.h:458 [inline]
 ip6_local_out+0xaf/0x190 net/ipv6/output_core.c:155
 ip6tunnel_xmit include/net/ip6_tunnel.h:161 [inline]
 udp_tunnel6_xmit_skb+0x741/0xbd0 net/ipv6/ip6_udp_tunnel.c:109
 geneve6_xmit_skb drivers/net/geneve.c:1071 [inline]
 geneve_xmit+0x1b98/0x4aa0 drivers/net/geneve.c:1100
 __netdev_start_xmit include/linux/netdevice.h:4889 [inline]
 netdev_start_xmit include/linux/netdevice.h:4903 [inline]
 xmit_one net/core/dev.c:3544 [inline]
 dev_hard_start_xmit+0x13d/0x6c0 net/core/dev.c:3560
 __dev_queue_xmit+0x9be/0x3d60 net/core/dev.c:4337
 dev_queue_xmit include/linux/netdevice.h:3082 [inline]
 packet_xmit+0x257/0x380 net/packet/af_packet.c:276
 packet_snd net/packet/af_packet.c:3083 [inline]
 packet_sendmsg+0x24c7/0x5550 net/packet/af_packet.c:3115
 sock_sendmsg_nosec net/socket.c:725 [inline]
 sock_sendmsg+0xd9/0x180 net/socket.c:748
 __sys_sendto+0x255/0x340 net/socket.c:2134
 __do_sys_sendto net/socket.c:2146 [inline]
 __se_sys_sendto net/socket.c:2142 [inline]
 __x64_sys_sendto+0xe0/0x1b0 net/socket.c:2142
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff88801ef32700
 which belongs to the cache skbuff_small_head of size 640
The buggy address is located 0 bytes to the right of
 allocated 640-byte region [ffff88801ef32700, ffff88801ef32980)

The buggy address belongs to the physical page:
page:ffffea00007bcc00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1ef30
head:ffffea00007bcc00 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000010200 ffff888141a5f780 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000150015 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5019, tgid 5019 (sshd), ts 77911268842, free_ts 48901229367
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x2d2/0x350 mm/page_alloc.c:1570
 prep_new_page mm/page_alloc.c:1577 [inline]
 get_page_from_freelist+0x10a9/0x31e0 mm/page_alloc.c:3221
 __alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4477
 alloc_pages+0x1a9/0x270 mm/mempolicy.c:2292
 alloc_slab_page mm/slub.c:1862 [inline]
 allocate_slab+0x24e/0x380 mm/slub.c:2009
 new_slab mm/slub.c:2062 [inline]
 ___slab_alloc+0x8bc/0x1570 mm/slub.c:3215
 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3314
 __slab_alloc_node mm/slub.c:3367 [inline]
 slab_alloc_node mm/slub.c:3460 [inline]
 kmem_cache_alloc_node+0x137/0x3f0 mm/slub.c:3515
 kmalloc_reserve+0x167/0x270 net/core/skbuff.c:559
 __alloc_skb+0x12b/0x330 net/core/skbuff.c:644
 alloc_skb_fclone include/linux/skbuff.h:1337 [inline]
 tcp_stream_alloc_skb+0x34/0x560 net/ipv4/tcp.c:868
 tcp_sendmsg_locked+0xf47/0x3420 net/ipv4/tcp.c:1148
 tcp_sendmsg+0x2e/0x40 net/ipv4/tcp.c:1334
 inet_sendmsg+0x9d/0xe0 net/ipv4/af_inet.c:830
 sock_sendmsg_nosec net/socket.c:725 [inline]
 sock_sendmsg+0xd9/0x180 net/socket.c:748
 sock_write_iter+0x29b/0x3d0 net/socket.c:1129
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+0x508/0xb90 mm/page_alloc.c:2348
 free_unref_page+0x33/0x3b0 mm/page_alloc.c:2443
 __unfreeze_partials+0x21d/0x240 mm/slub.c:2647
 qlink_free mm/kasan/quarantine.c:166 [inline]
 qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:185
 kasan_quarantine_reduce+0x18b/0x1d0 mm/kasan/quarantine.c:292
 __kasan_slab_alloc+0x65/0x90 mm/kasan/common.c:305
 kasan_slab_alloc include/linux/kasan.h:186 [inline]
 slab_post_alloc_hook mm/slab.h:762 [inline]
 slab_alloc_node mm/slub.c:3470 [inline]
 slab_alloc mm/slub.c:3478 [inline]
 __kmem_cache_alloc_lru mm/slub.c:3485 [inline]
 kmem_cache_alloc+0x172/0x3b0 mm/slub.c:3494
 getname_flags.part.0+0x50/0x4d0 fs/namei.c:140
 getname_flags include/linux/audit.h:319 [inline]
 getname+0x90/0xe0 fs/namei.c:219
 do_sys_openat2+0x100/0x1e0 fs/open.c:1401
 do_sys_open fs/open.c:1422 [inline]
 __do_sys_openat fs/open.c:1438 [inline]
 __se_sys_openat fs/open.c:1433 [inline]
 __x64_sys_openat+0x175/0x210 fs/open.c:1433
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
 ffff88801ef32880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88801ef32900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88801ef32980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff88801ef32a00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88801ef32a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================