syzbot

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BUG: KASAN: slab-out-of-bounds in xfrm_policy_inexact_list_reinsert+0x518/0x568 net/xfrm/xfrm_policy.c:874
Read of size 1 at addr ffff0000c2abb600 by task syz-executor160/4019

CPU: 0 PID: 4019 Comm: syz-executor160 Not tainted 5.15.177-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 print_address_description+0x7c/0x3f0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:434 [inline]
 kasan_report+0x174/0x1e4 mm/kasan/report.c:451
 __asan_report_load1_noabort+0x44/0x50 mm/kasan/report_generic.c:306
 xfrm_policy_inexact_list_reinsert+0x518/0x568 net/xfrm/xfrm_policy.c:874
 xfrm_policy_inexact_node_merge net/xfrm/xfrm_policy.c:1006 [inline]
 xfrm_policy_inexact_insert_node+0x77c/0x924 net/xfrm/xfrm_policy.c:1062
 xfrm_policy_inexact_alloc_chain+0x57c/0x1078 net/xfrm/xfrm_policy.c:1178
 xfrm_policy_inexact_insert+0xdc/0x1084 net/xfrm/xfrm_policy.c:1221
 xfrm_policy_insert+0xd0/0x870 net/xfrm/xfrm_policy.c:1602
 xfrm_add_policy+0x424/0x82c net/xfrm/xfrm_user.c:1833
 xfrm_user_rcv_msg+0x4a8/0x72c net/xfrm/xfrm_user.c:2979
 netlink_rcv_skb+0x20c/0x3b8 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+0x664/0x938 net/netlink/af_netlink.c:1337
 netlink_sendmsg+0x844/0xb38 net/netlink/af_netlink.c:1905
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 ____sys_sendmsg+0x584/0x870 net/socket.c:2436
 ___sys_sendmsg+0x214/0x294 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+0x1ac/0x25c 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+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584

Allocated by task 4019:
 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+0xbc/0xfc mm/kasan/common.c:513
 __kasan_kmalloc+0x10/0x1c mm/kasan/common.c:522
 kasan_kmalloc include/linux/kasan.h:264 [inline]
 __kmalloc+0x29c/0x4c8 mm/slub.c:4407
 kmalloc include/linux/slab.h:596 [inline]
 sk_prot_alloc+0xc4/0x1f0 net/core/sock.c:1866
 sk_alloc+0x40/0x3e0 net/core/sock.c:1919
 pfkey_create+0xcc/0x53c net/key/af_key.c:152
 __sock_create+0x43c/0x8a0 net/socket.c:1486
 sock_create net/socket.c:1542 [inline]
 __sys_socket+0x168/0x310 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+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 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 ffff0000c2abb000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1536 bytes inside of
 2048-byte region [ffff0000c2abb000, ffff0000c2abb800)
The buggy address belongs to the page:
page:000000001f79c778 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x102ab8
head:000000001f79c778 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 0000000080080008 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000c2abb500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000c2abb580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc
>ffff0000c2abb600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                   ^
 ffff0000c2abb680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff0000c2abb700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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