================================================================== BUG: KASAN: slab-out-of-bounds in xfrm_policy_inexact_list_reinsert+0x5df/0x690 net/xfrm/xfrm_policy.c:874 Read of size 1 at addr ffff88805ca6a600 by task syz.2.138/4728 CPU: 0 PID: 4728 Comm: syz.2.138 Not tainted 5.15.189-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106 print_address_description+0x60/0x2d0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xdf/0x130 mm/kasan/report.c:451 xfrm_policy_inexact_list_reinsert+0x5df/0x690 net/xfrm/xfrm_policy.c:874 xfrm_policy_inexact_node_merge net/xfrm/xfrm_policy.c:1006 [inline] xfrm_policy_inexact_insert_node+0x950/0xb60 net/xfrm/xfrm_policy.c:1062 xfrm_policy_inexact_alloc_chain+0x7cf/0xea0 net/xfrm/xfrm_policy.c:1178 xfrm_policy_inexact_insert+0xe0/0x1460 net/xfrm/xfrm_policy.c:1221 xfrm_policy_insert+0x112/0x930 net/xfrm/xfrm_policy.c:1605 xfrm_add_policy+0x4d6/0x860 net/xfrm/xfrm_user.c:1833 xfrm_user_rcv_msg+0x58d/0x860 net/xfrm/xfrm_user.c:2979 netlink_rcv_skb+0x1e0/0x430 net/netlink/af_netlink.c:2507 xfrm_netlink_rcv+0x75/0x90 net/xfrm/xfrm_user.c:3001 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x774/0x920 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x8ab/0xbc0 net/netlink/af_netlink.c:1918 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+0x190/0x250 net/socket.c:2526 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: 0033:0x7f5656048be9 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:00007f56542b0038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f565626ffa0 RCX: 00007f5656048be9 RDX: 0000000000004000 RSI: 0000200000000580 RDI: 0000000000000004 RBP: 00007f56560cbe19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5656270038 R14: 00007f565626ffa0 R15: 00007ffcc50e3fe8 Allocated by task 4728: 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+0xb5/0xf0 mm/kasan/common.c:522 kmalloc include/linux/slab.h:609 [inline] sk_prot_alloc+0xe7/0x210 net/core/sock.c:1864 sk_alloc+0x2f/0x310 net/core/sock.c:1917 pfkey_create+0xd8/0x560 net/key/af_key.c:152 __sock_create+0x47b/0x900 net/socket.c:1486 sock_create net/socket.c:1542 [inline] __sys_socket+0xe2/0x170 net/socket.c:1584 __do_sys_socket net/socket.c:1593 [inline] __se_sys_socket net/socket.c:1591 [inline] __x64_sys_socket+0x76/0x80 net/socket.c:1591 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 ffff88805ca6a000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 1536 bytes inside of 2048-byte region [ffff88805ca6a000, ffff88805ca6a800) The buggy address belongs to the page: page:ffffea0001729a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5ca68 head:ffffea0001729a00 order:3 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 0000000100000001 ffff888016842000 raw: 0000000000000000 0000000080080008 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 4322, ts 63197355389, free_ts 63019286629 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192 __alloc_pages+0x1e1/0x470 mm/page_alloc.c:5474 alloc_slab_page mm/slub.c:1775 [inline] allocate_slab mm/slub.c:1912 [inline] new_slab+0xc0/0x4b0 mm/slub.c:1975 ___slab_alloc+0x81e/0xdf0 mm/slub.c:3008 __slab_alloc mm/slub.c:3095 [inline] slab_alloc_node mm/slub.c:3186 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc_trace+0x1a5/0x2a0 mm/slub.c:3245 kmalloc include/linux/slab.h:604 [inline] kzalloc include/linux/slab.h:735 [inline] alloc_tty_struct+0xa6/0x780 drivers/tty/tty_io.c:3127 pty_common_install+0x17e/0x780 drivers/tty/pty.c:379 tty_driver_install_tty drivers/tty/tty_io.c:1317 [inline] tty_init_dev+0xbb/0x470 drivers/tty/tty_io.c:1431 ptmx_open+0xe1/0x2c0 drivers/tty/pty.c:824 chrdev_open+0x597/0x670 fs/char_dev.c:414 do_dentry_open+0x7ff/0xf80 fs/open.c:826 do_open fs/namei.c:3608 [inline] path_openat+0x2682/0x2f30 fs/namei.c:3742 do_filp_open+0x1b3/0x3e0 fs/namei.c:3769 do_sys_openat2+0x142/0x4a0 fs/open.c:1253 do_sys_open fs/open.c:1269 [inline] __do_sys_openat fs/open.c:1285 [inline] __se_sys_openat fs/open.c:1280 [inline] __x64_sys_openat+0x135/0x160 fs/open.c:1280 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317 free_unref_page+0x94/0x280 mm/page_alloc.c:3396 put_page include/linux/mm.h:1247 [inline] bio_release_pages+0x2b9/0x4e0 block/bio.c:1031 blkdev_bio_end_io+0x2bf/0x3e0 block/fops.c:186 req_bio_endio block/blk-core.c:261 [inline] blk_update_request+0x876/0x1200 block/blk-core.c:1441 blk_mq_end_request+0x3a/0x70 block/blk-mq.c:575 blk_flush_complete_seq+0x5d4/0xc90 block/blk-flush.c:204 mq_flush_data_end_io+0x33f/0x460 block/blk-flush.c:369 blk_complete_reqs block/blk-mq.c:587 [inline] blk_done_softirq+0xfa/0x140 block/blk-mq.c:592 handle_softirqs+0x328/0x820 kernel/softirq.c:576 run_ksoftirqd+0x98/0xf0 kernel/softirq.c:943 smpboot_thread_fn+0x4f6/0x970 kernel/smpboot.c:164 kthread+0x436/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Memory state around the buggy address: ffff88805ca6a500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88805ca6a580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc >ffff88805ca6a600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88805ca6a680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805ca6a700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc 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