================================================================== BUG: KASAN: slab-out-of-bounds in xfrm_policy_inexact_list_reinsert+0x620/0x6d0 net/xfrm/xfrm_policy.c:853 Read of size 1 at addr ffff8881202c1bf8 by task syz-executor403/289 CPU: 1 PID: 289 Comm: syz-executor403 Not tainted 5.15.189-syzkaller-android13-5.15.189_r00 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0xee/0x150 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+0x620/0x6d0 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+0x53a/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+0x4d1/0x830 net/xfrm/xfrm_user.c:1832 xfrm_user_rcv_msg+0x45c/0x6e0 net/xfrm/xfrm_user.c:2981 netlink_rcv_skb+0x1e0/0x430 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+0x86a/0xb70 net/netlink/af_netlink.c:1922 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] ____sys_sendmsg+0x5a2/0x8c0 net/socket.c:2436 ___sys_sendmsg+0x1f0/0x260 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] __x64_sys_sendmsg+0x1e2/0x2a0 net/socket.c:2526 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: 0033:0x7f83166bfae9 Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd70ff5ed8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f83166bfae9 RDX: 0000000000004000 RSI: 0000200000000580 RDI: 0000000000000005 RBP: 0000200000000580 R08: 0000200000000017 R09: 0000000000000000 R10: 0000200000000012 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 000000000000000a Allocated by task 289: 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:4431 kmalloc include/linux/slab.h:621 [inline] sk_prot_alloc+0xed/0x320 net/core/sock.c:1866 sk_alloc+0x38/0x430 net/core/sock.c:1923 pfkey_create+0x12a/0x660 net/key/af_key.c:152 __sock_create+0x38d/0x7a0 net/socket.c:1486 sock_create net/socket.c:1542 [inline] __sys_socket+0xec/0x190 net/socket.c:1584 __do_sys_socket net/socket.c:1593 [inline] __se_sys_socket net/socket.c:1591 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1591 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 ffff8881202c1800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 1016 bytes inside of 1024-byte region [ffff8881202c1800, ffff8881202c1c00) The buggy address belongs to the page: page:ffffea000480b000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1202c0 head:ffffea000480b000 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 0000000000000000 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 0x52a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 289, ts 25471762114, free_ts 25468714264 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+0x2cc5/0x2d50 mm/page_alloc.c:4485 __alloc_pages+0x18f/0x440 mm/page_alloc.c:5795 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1932 [inline] new_slab+0xa1/0x4d0 mm/slub.c:1995 ___slab_alloc+0x381/0x810 mm/slub.c:3028 __slab_alloc+0x49/0x90 mm/slub.c:3115 slab_alloc_node mm/slub.c:3206 [inline] slab_alloc mm/slub.c:3250 [inline] kmem_cache_alloc_trace+0x146/0x270 mm/slub.c:3267 kmalloc include/linux/slab.h:616 [inline] kzalloc include/linux/slab.h:747 [inline] xfrm_policy_alloc+0x79/0x280 net/xfrm/xfrm_policy.c:392 xfrm_compile_policy+0x74e/0xc70 net/xfrm/xfrm_user.c:3342 xfrm_user_policy+0x29f/0x510 net/xfrm/xfrm_state.c:2469 do_ipv6_setsockopt net/ipv6/ipv6_sockglue.c:942 [inline] ipv6_setsockopt+0x10bc/0x38a0 net/ipv6/ipv6_sockglue.c:1006 udpv6_setsockopt+0x92/0xb0 net/ipv6/udp.c:1684 sock_common_setsockopt+0xa0/0xb0 net/core/sock.c:3460 __sys_setsockopt+0x2f0/0x460 net/socket.c:2203 __do_sys_setsockopt net/socket.c:2214 [inline] __se_sys_setsockopt net/socket.c:2211 [inline] __x64_sys_setsockopt+0xbf/0xd0 net/socket.c:2211 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1472 [inline] free_pcp_prepare mm/page_alloc.c:1544 [inline] free_unref_page_prepare+0x542/0x550 mm/page_alloc.c:3534 free_unref_page+0xa2/0x550 mm/page_alloc.c:3616 free_the_page mm/page_alloc.c:805 [inline] free_compound_page+0x78/0xa0 mm/page_alloc.c:828 destroy_compound_page include/linux/mm.h:989 [inline] __put_compound_page+0x77/0xb0 mm/swap.c:111 __put_page+0xbc/0xe0 mm/swap.c:127 put_page include/linux/mm.h:1295 [inline] page_to_skb+0x7b9/0xb60 drivers/net/virtio_net.c:529 receive_mergeable drivers/net/virtio_net.c:1102 [inline] receive_buf+0xc64/0x4ad0 drivers/net/virtio_net.c:1212 virtnet_receive drivers/net/virtio_net.c:1504 [inline] virtnet_poll+0x545/0xef0 drivers/net/virtio_net.c:1617 __napi_poll+0xbe/0x590 net/core/dev.c:7083 napi_poll net/core/dev.c:7150 [inline] net_rx_action+0x371/0x8e0 net/core/dev.c:7240 handle_softirqs+0x250/0x560 kernel/softirq.c:583 __do_softirq+0xb/0xd kernel/softirq.c:621 Memory state around the buggy address: ffff8881202c1a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881202c1b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881202c1b80: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ^ ffff8881202c1c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881202c1c80: fc fc fc fc fc fc fc fc