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BUG: KASAN: slab-out-of-bounds in xfrm_policy_inexact_list_reinsert+0x494/0x564 net/xfrm/xfrm_policy.c:874
Read of size 1 at addr ffff0000d242d600 by task syz-executor360/4024

CPU: 1 PID: 4024 Comm: syz-executor360 Not tainted 5.15.184-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call trace:
 dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack+0x30/0x40 lib/dump_stack.c:88
 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106
 print_address_description+0x78/0x30c mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0xec/0x15c mm/kasan/report.c:451
 __asan_report_load1_noabort+0x44/0x50 mm/kasan/report_generic.c:306
 xfrm_policy_inexact_list_reinsert+0x494/0x564 net/xfrm/xfrm_policy.c:874
 xfrm_policy_inexact_node_merge net/xfrm/xfrm_policy.c:1006 [inline]
 xfrm_policy_inexact_insert_node+0x780/0x924 net/xfrm/xfrm_policy.c:1062
 xfrm_policy_inexact_alloc_chain+0x874/0x1160 net/xfrm/xfrm_policy.c:1178
 xfrm_policy_inexact_insert+0xe0/0x1088 net/xfrm/xfrm_policy.c:1221
 xfrm_policy_insert+0xd0/0x830 net/xfrm/xfrm_policy.c:1602
 xfrm_add_policy+0x400/0x74c net/xfrm/xfrm_user.c:1833
 xfrm_user_rcv_msg+0x40c/0x650 net/xfrm/xfrm_user.c:2979
 netlink_rcv_skb+0x208/0x3c4 net/netlink/af_netlink.c:2489
 xfrm_netlink_rcv+0x80/0x9c net/xfrm/xfrm_user.c:3001
 netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline]
 netlink_unicast+0x60c/0x89c net/netlink/af_netlink.c:1337
 netlink_sendmsg+0x6e8/0x9cc net/netlink/af_netlink.c:1905
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 ____sys_sendmsg+0x61c/0x920 net/socket.c:2436
 ___sys_sendmsg+0x1d0/0x240 net/socket.c:2490
 __sys_sendmsg net/socket.c:2519 [inline]
 __do_sys_sendmsg net/socket.c:2528 [inline]
 __se_sys_sendmsg net/socket.c:2526 [inline]
 __arm64_sys_sendmsg+0x1a8/0x254 net/socket.c:2526
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

Allocated by task 4024:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 ____kasan_kmalloc mm/kasan/common.c:513 [inline]
 __kasan_kmalloc+0xb0/0xf0 mm/kasan/common.c:522
 kasan_kmalloc include/linux/kasan.h:264 [inline]
 __kmalloc+0x298/0x44c mm/slub.c:4407
 kmalloc include/linux/slab.h:609 [inline]
 sk_prot_alloc+0xc4/0x1f0 net/core/sock.c:1864
 sk_alloc+0x40/0x388 net/core/sock.c:1917
 pfkey_create+0xcc/0x540 net/key/af_key.c:152
 __sock_create+0x4b0/0x8b4 net/socket.c:1486
 sock_create net/socket.c:1542 [inline]
 __sys_socket+0xf0/0x18c net/socket.c:1584
 __do_sys_socket net/socket.c:1593 [inline]
 __se_sys_socket net/socket.c:1591 [inline]
 __arm64_sys_socket+0x7c/0x94 net/socket.c:1591
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

The buggy address belongs to the object at ffff0000d242d000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1536 bytes inside of
 2048-byte region [ffff0000d242d000, ffff0000d242d800)
The buggy address belongs to the page:
page:000000009f3e825f refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x112428
head:000000009f3e825f order:3 compound_mapcount:0 compound_pincount:0
flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000010200 0000000000000000 dead000000000122 ffff0000c0002900
raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000d242d500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000d242d580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc
>ffff0000d242d600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff0000d242d680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000d242d700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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