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BUG: KASAN: slab-out-of-bounds in xfrm_policy_inexact_list_reinsert+0x606/0x6c0 net/xfrm/xfrm_policy.c:853
Read of size 1 at addr ffff888120c8ebf8 by task syz.6.329/1244

CPU: 0 PID: 1244 Comm: syz.6.329 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:88
 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:427 [inline]
 kasan_report+0xf1/0x140 mm/kasan/report.c:444
 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306
 xfrm_policy_inexact_list_reinsert+0x606/0x6c0 net/xfrm/xfrm_policy.c:853
 xfrm_policy_inexact_node_merge net/xfrm/xfrm_policy.c:985 [inline]
 xfrm_policy_inexact_insert_node+0x938/0xb50 net/xfrm/xfrm_policy.c:1041
 xfrm_policy_inexact_alloc_chain+0x53d/0xb30 net/xfrm/xfrm_policy.c:1157
 xfrm_policy_inexact_insert+0x70/0x1130 net/xfrm/xfrm_policy.c:1200
 xfrm_policy_insert+0x126/0x9a0 net/xfrm/xfrm_policy.c:1586
 xfrm_add_policy+0x4ed/0x850 net/xfrm/xfrm_user.c:1832
 xfrm_user_rcv_msg+0x4dc/0x7b0 net/xfrm/xfrm_user.c:2981
 netlink_rcv_skb+0x1f5/0x440 net/netlink/af_netlink.c:2511
 xfrm_netlink_rcv+0x72/0x90 net/xfrm/xfrm_user.c:3003
 netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline]
 netlink_unicast+0x876/0xa40 net/netlink/af_netlink.c:1348
 netlink_sendmsg+0x879/0xb80 net/netlink/af_netlink.c:1922
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 ____sys_sendmsg+0x5b7/0x8f0 net/socket.c:2435
 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2489
 __sys_sendmsg net/socket.c:2518 [inline]
 __do_sys_sendmsg net/socket.c:2527 [inline]
 __se_sys_sendmsg net/socket.c:2525 [inline]
 __x64_sys_sendmsg+0x206/0x2f0 net/socket.c:2525
 x64_sys_call+0x4b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f49d061f799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f49cf07a028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f49d0898fa0 RCX: 00007f49d061f799
RDX: 0000000000000000 RSI: 0000200000000580 RDI: 0000000000000009
RBP: 00007f49d06b5c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f49d0899038 R14: 00007f49d0898fa0 R15: 00007fff7c239ec8
 </TASK>

Allocated by task 1244:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:433 [inline]
 ____kasan_kmalloc mm/kasan/common.c:512 [inline]
 __kasan_kmalloc+0xda/0x110 mm/kasan/common.c:521
 kasan_kmalloc include/linux/kasan.h:227 [inline]
 __kmalloc+0x13d/0x2c0 mm/slub.c:4436
 kmalloc include/linux/slab.h:624 [inline]
 sk_prot_alloc+0xed/0x320 net/core/sock.c:1868
 sk_alloc+0x38/0x430 net/core/sock.c:1928
 pfkey_create+0x12a/0x660 net/key/af_key.c:152
 __sock_create+0x38d/0x7a0 net/socket.c:1485
 sock_create net/socket.c:1541 [inline]
 __sys_socket+0xec/0x190 net/socket.c:1583
 __do_sys_socket net/socket.c:1592 [inline]
 __se_sys_socket net/socket.c:1590 [inline]
 __x64_sys_socket+0x7a/0x90 net/socket.c:1590
 x64_sys_call+0x8c5/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:42
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

The buggy address belongs to the object at ffff888120c8e800
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 1016 bytes inside of
 1024-byte region [ffff888120c8e800, ffff888120c8ec00)
The buggy address belongs to the page:
page:ffffea0004832200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x120c88
head:ffffea0004832200 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100043080
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 273, ts 20194076494, free_ts 0
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2605
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2611
 get_page_from_freelist+0x2d3a/0x2dc0 mm/page_alloc.c:4485
 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5822
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab mm/slub.c:1937 [inline]
 new_slab+0xa1/0x4d0 mm/slub.c:2000
 ___slab_alloc+0x381/0x810 mm/slub.c:3033
 __slab_alloc+0x49/0x90 mm/slub.c:3120
 slab_alloc_node mm/slub.c:3211 [inline]
 slab_alloc mm/slub.c:3255 [inline]
 __kmalloc_track_caller+0x169/0x2c0 mm/slub.c:4954
 kmalloc_reserve net/core/skbuff.c:357 [inline]
 __alloc_skb+0x21a/0x740 net/core/skbuff.c:428
 __napi_alloc_skb+0x162/0x2e0 net/core/skbuff.c:569
 napi_alloc_skb include/linux/skbuff.h:3102 [inline]
 page_to_skb+0x287/0xb60 drivers/net/virtio_net.c:474
 receive_mergeable drivers/net/virtio_net.c:1102 [inline]
 receive_buf+0xcc7/0x4c50 drivers/net/virtio_net.c:1212
 virtnet_receive drivers/net/virtio_net.c:1504 [inline]
 virtnet_poll+0x570/0xf40 drivers/net/virtio_net.c:1617
 __napi_poll+0xbe/0x590 net/core/dev.c:7109
 napi_poll net/core/dev.c:7176 [inline]
 net_rx_action+0x389/0x900 net/core/dev.c:7266
 handle_softirqs+0x250/0x560 kernel/softirq.c:583
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888120c8ea80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888120c8eb00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff888120c8eb80: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
                                                                ^
 ffff888120c8ec00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888120c8ec80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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