================================================================== BUG: KASAN: slab-out-of-bounds in xfrm_policy_inexact_list_reinsert+0x599/0x650 net/xfrm/xfrm_policy.c:855 Read of size 1 at addr ffff8881df1c5bd8 by task syz.0.272/1031 CPU: 1 PID: 1031 Comm: syz.0.272 Not tainted 5.4.290-syzkaller-00002-g41adfeb3d639 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d8/0x241 lib/dump_stack.c:118 print_address_description+0x8c/0x600 mm/kasan/report.c:384 __kasan_report+0xf3/0x120 mm/kasan/report.c:516 kasan_report+0x30/0x60 mm/kasan/common.c:653 xfrm_policy_inexact_list_reinsert+0x599/0x650 net/xfrm/xfrm_policy.c:855 xfrm_policy_inexact_node_merge net/xfrm/xfrm_policy.c:987 [inline] xfrm_policy_inexact_insert_node+0x8f3/0xb00 net/xfrm/xfrm_policy.c:1043 xfrm_policy_inexact_alloc_chain+0x4f9/0xb10 net/xfrm/xfrm_policy.c:1159 xfrm_policy_inexact_insert+0x69/0x10e0 net/xfrm/xfrm_policy.c:1202 xfrm_policy_insert+0xe1/0x8a0 net/xfrm/xfrm_policy.c:1585 xfrm_add_policy+0x4f2/0x980 net/xfrm/xfrm_user.c:1720 xfrm_user_rcv_msg+0x689/0x9b0 net/xfrm/xfrm_user.c:2775 netlink_rcv_skb+0x1d5/0x420 net/netlink/af_netlink.c:2467 xfrm_netlink_rcv+0x6e/0x80 net/xfrm/xfrm_user.c:2797 netlink_unicast_kernel net/netlink/af_netlink.c:1306 [inline] netlink_unicast+0x936/0xb20 net/netlink/af_netlink.c:1332 netlink_sendmsg+0xa18/0xcf0 net/netlink/af_netlink.c:1900 sock_sendmsg_nosec net/socket.c:638 [inline] __sock_sendmsg net/socket.c:650 [inline] ____sys_sendmsg+0x5ac/0x8f0 net/socket.c:2306 ___sys_sendmsg net/socket.c:2360 [inline] __sys_sendmsg+0x28b/0x380 net/socket.c:2406 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 RIP: 0033:0x7fd58a4f9169 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fd588b63038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fd58a711fa0 RCX: 00007fd58a4f9169 RDX: 0000000000000000 RSI: 0000200000000580 RDI: 0000000000000005 RBP: 00007fd58a57a2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fd58a711fa0 R15: 00007ffe90bed018 Allocated by task 1031: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x171/0x210 mm/kasan/common.c:529 kmalloc include/linux/slab.h:561 [inline] sk_prot_alloc+0xbd/0x3e0 net/core/sock.c:1622 sk_alloc+0x35/0x2f0 net/core/sock.c:1680 pfkey_create+0x122/0x670 net/key/af_key.c:154 __sock_create+0x3cb/0x7a0 net/socket.c:1427 sock_create net/socket.c:1478 [inline] __sys_socket+0x132/0x370 net/socket.c:1520 __do_sys_socket net/socket.c:1529 [inline] __se_sys_socket net/socket.c:1527 [inline] __x64_sys_socket+0x76/0x80 net/socket.c:1527 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Freed by task 0: save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] kasan_set_free_info mm/kasan/common.c:345 [inline] __kasan_slab_free+0x1b5/0x270 mm/kasan/common.c:487 slab_free_hook mm/slub.c:1455 [inline] slab_free_freelist_hook mm/slub.c:1494 [inline] slab_free mm/slub.c:3080 [inline] kfree+0x123/0x370 mm/slub.c:4071 skb_release_all net/core/skbuff.c:675 [inline] __kfree_skb+0x4c/0x60 net/core/skbuff.c:689 tcp_clean_rtx_queue net/ipv4/tcp_input.c:3232 [inline] tcp_ack+0x20cb/0x6080 net/ipv4/tcp_input.c:3783 tcp_rcv_established+0xd16/0x1a80 net/ipv4/tcp_input.c:5742 tcp_v4_do_rcv+0x3a9/0x770 net/ipv4/tcp_ipv4.c:1598 tcp_v4_rcv+0x219a/0x26f0 net/ipv4/tcp_ipv4.c:1990 ip_protocol_deliver_rcu+0x2e0/0x630 net/ipv4/ip_input.c:204 ip_local_deliver_finish net/ipv4/ip_input.c:231 [inline] NF_HOOK include/linux/netfilter.h:303 [inline] ip_local_deliver+0x2c6/0x5a0 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:444 [inline] ip_sublist_rcv_finish net/ipv4/ip_input.c:541 [inline] ip_list_rcv_finish net/ipv4/ip_input.c:579 [inline] ip_sublist_rcv+0xc02/0xc80 net/ipv4/ip_input.c:587 ip_list_rcv+0x477/0x4c0 net/ipv4/ip_input.c:621 __netif_receive_skb_list_ptype net/core/dev.c:5034 [inline] __netif_receive_skb_list_core+0x6dd/0x8f0 net/core/dev.c:5082 __netif_receive_skb_list net/core/dev.c:5134 [inline] netif_receive_skb_list_internal+0x944/0xc90 net/core/dev.c:5229 gro_normal_list net/core/dev.c:5340 [inline] napi_complete_done+0x20a/0x580 net/core/dev.c:6071 virtqueue_napi_complete drivers/net/virtio_net.c:357 [inline] virtnet_poll+0xb6b/0x1250 drivers/net/virtio_net.c:1516 napi_poll net/core/dev.c:6386 [inline] net_rx_action+0x53f/0x1160 net/core/dev.c:6454 __do_softirq+0x23b/0x6b7 kernel/softirq.c:292 The buggy address belongs to the object at ffff8881df1c5800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 984 bytes inside of 1024-byte region [ffff8881df1c5800, ffff8881df1c5c00) The buggy address belongs to the page: page:ffffea00077c7000 refcount:1 mapcount:0 mapping:ffff8881f5c02280 index:0x0 compound_mapcount: 0 flags: 0x8000000000010200(slab|head) raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f5c02280 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC) set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook mm/page_alloc.c:2165 [inline] prep_new_page+0x18f/0x370 mm/page_alloc.c:2171 get_page_from_freelist+0x2d13/0x2d90 mm/page_alloc.c:3794 __alloc_pages_nodemask+0x393/0x840 mm/page_alloc.c:4893 alloc_slab_page+0x39/0x3c0 mm/slub.c:343 allocate_slab mm/slub.c:1683 [inline] new_slab+0x97/0x440 mm/slub.c:1749 new_slab_objects mm/slub.c:2505 [inline] ___slab_alloc+0x2fe/0x490 mm/slub.c:2667 __slab_alloc+0x62/0xa0 mm/slub.c:2707 slab_alloc_node mm/slub.c:2792 [inline] slab_alloc mm/slub.c:2837 [inline] __kmalloc+0x19b/0x2e0 mm/slub.c:3909 kmalloc_array include/linux/slab.h:618 [inline] kcalloc include/linux/slab.h:629 [inline] alloc_pipe_info+0x1f3/0x400 fs/pipe.c:691 get_pipe_inode fs/pipe.c:753 [inline] create_pipe_files+0x85/0x610 fs/pipe.c:785 __do_pipe_flags+0x46/0x200 fs/pipe.c:822 do_pipe2+0xd0/0x300 fs/pipe.c:870 __do_sys_pipe2 fs/pipe.c:888 [inline] __se_sys_pipe2 fs/pipe.c:886 [inline] __x64_sys_pipe2+0x56/0x60 fs/pipe.c:886 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1176 [inline] __free_pages_ok+0x847/0x950 mm/page_alloc.c:1438 free_the_page mm/page_alloc.c:4955 [inline] __free_pages+0x91/0x140 mm/page_alloc.c:4961 free_thread_stack kernel/fork.c:299 [inline] release_task_stack kernel/fork.c:439 [inline] put_task_stack+0x212/0x260 kernel/fork.c:450 finish_task_switch+0x24a/0x590 kernel/sched/core.c:3479 context_switch kernel/sched/core.c:3611 [inline] __schedule+0xb0d/0x1320 kernel/sched/core.c:4307 schedule_idle+0x50/0x80 kernel/sched/core.c:4403 do_idle+0x609/0x660 kernel/sched/idle.c:288 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:356 start_kernel+0x6d9/0x81d init/main.c:1036 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241 Memory state around the buggy address: ffff8881df1c5a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881df1c5b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881df1c5b80: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ^ ffff8881df1c5c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881df1c5c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc 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