================================================================== BUG: KASAN: slab-out-of-bounds in xfrm_policy_inexact_list_reinsert+0x5b0/0x660 net/xfrm/xfrm_policy.c:853 Read of size 1 at addr ffff888115f47bd8 by task syz.0.1219/5159 CPU: 1 PID: 5159 Comm: syz.0.1219 Tainted: G W 5.10.233-syzkaller-00881-gfbe98d68b6b3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118 print_address_description+0x81/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0x179/0x1c0 mm/kasan/report.c:452 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306 xfrm_policy_inexact_list_reinsert+0x5b0/0x660 net/xfrm/xfrm_policy.c:853 xfrm_policy_inexact_node_merge net/xfrm/xfrm_policy.c:985 [inline] xfrm_policy_inexact_insert_node+0x917/0xb00 net/xfrm/xfrm_policy.c:1041 xfrm_policy_inexact_alloc_chain+0x4ec/0xaf0 net/xfrm/xfrm_policy.c:1157 xfrm_policy_inexact_insert+0x6a/0x1160 net/xfrm/xfrm_policy.c:1200 xfrm_policy_insert+0xe7/0x940 net/xfrm/xfrm_policy.c:1583 xfrm_add_policy+0x4f2/0x980 net/xfrm/xfrm_user.c:1733 xfrm_user_rcv_msg+0x4e7/0x7c0 net/xfrm/xfrm_user.c:2789 netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2485 xfrm_netlink_rcv+0x72/0x90 net/xfrm/xfrm_user.c:2811 netlink_unicast_kernel net/netlink/af_netlink.c:1307 [inline] netlink_unicast+0x8df/0xac0 net/netlink/af_netlink.c:1333 netlink_sendmsg+0xa46/0xd00 net/netlink/af_netlink.c:1901 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2376 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2430 __sys_sendmsg net/socket.c:2459 [inline] __do_sys_sendmsg net/socket.c:2468 [inline] __se_sys_sendmsg+0x1b1/0x280 net/socket.c:2466 __x64_sys_sendmsg+0x7b/0x90 net/socket.c:2466 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f76250b2da9 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:00007f762371d038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f76252cbfa0 RCX: 00007f76250b2da9 RDX: 0000000000004000 RSI: 0000000020000580 RDI: 0000000000000005 RBP: 00007f76251342a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f76252cbfa0 R15: 00007ffd01dc48d8 Allocated by task 5159: 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:430 [inline] ____kasan_kmalloc+0xdb/0x110 mm/kasan/common.c:509 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:518 kasan_kmalloc include/linux/kasan.h:254 [inline] __kmalloc+0x1aa/0x330 mm/slub.c:4033 kmalloc include/linux/slab.h:557 [inline] sk_prot_alloc+0xbe/0x370 net/core/sock.c:1716 sk_alloc+0x38/0x4d0 net/core/sock.c:1774 pfkey_create+0x12c/0x620 net/key/af_key.c:154 __sock_create+0x3a6/0x760 net/socket.c:1436 sock_create net/socket.c:1487 [inline] __sys_socket+0x132/0x370 net/socket.c:1529 __do_sys_socket net/socket.c:1538 [inline] __se_sys_socket net/socket.c:1536 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1536 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff888115f47800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 984 bytes inside of 1024-byte region [ffff888115f47800, ffff888115f47c00) The buggy address belongs to the page: page:ffffea000457d000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x115f40 head:ffffea000457d000 order:3 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head) raw: 4000000000010200 dead000000000100 dead000000000122 ffff888100042f00 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 4262, ts 232807116454, free_ts 230832046776 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x166/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x2d8c/0x2f30 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x435/0xaf0 mm/page_alloc.c:5348 allocate_slab mm/slub.c:1808 [inline] new_slab+0x80/0x400 mm/slub.c:1869 new_slab_objects mm/slub.c:2627 [inline] ___slab_alloc+0x302/0x4b0 mm/slub.c:2791 __slab_alloc+0x63/0xa0 mm/slub.c:2831 slab_alloc_node mm/slub.c:2913 [inline] slab_alloc mm/slub.c:2955 [inline] __kmalloc_track_caller+0x1f8/0x320 mm/slub.c:4536 __kmalloc_reserve net/core/skbuff.c:144 [inline] __alloc_skb+0xbc/0x510 net/core/skbuff.c:212 alloc_skb include/linux/skbuff.h:1126 [inline] nlmsg_new include/net/netlink.h:953 [inline] rtmsg_fib+0x5de/0xbf0 net/ipv4/fib_semantics.c:522 fib_table_insert+0x1096/0x1eb0 net/ipv4/fib_trie.c:1354 fib_magic net/ipv4/fib_frontend.c:1093 [inline] fib_add_ifaddr+0xe1e/0x1a40 net/ipv4/fib_frontend.c:1137 fib_netdev_event+0x235/0x5d0 net/ipv4/fib_frontend.c:1477 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0x8c/0xf0 kernel/notifier.c:410 __dev_notify_flags+0x304/0x610 dev_change_flags+0xf0/0x1a0 net/core/dev.c:8609 do_setlink+0xc5c/0x3c30 net/core/rtnetlink.c:2729 page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1349 [inline] free_pcp_prepare mm/page_alloc.c:1421 [inline] free_unref_page_prepare+0x2ae/0x2d0 mm/page_alloc.c:3336 free_unref_page mm/page_alloc.c:3391 [inline] free_the_page+0x9e/0x370 mm/page_alloc.c:5407 __free_pages+0x67/0xc0 mm/page_alloc.c:5418 __vunmap+0x7bc/0x8f0 mm/vmalloc.c:2301 __vfree mm/vmalloc.c:2349 [inline] vfree+0x5c/0x80 mm/vmalloc.c:2380 kcov_put kernel/kcov.c:408 [inline] kcov_close+0x2b/0x50 kernel/kcov.c:510 __fput+0x33d/0x7b0 fs/file_table.c:281 ____fput+0x15/0x20 fs/file_table.c:314 task_work_run+0x129/0x190 kernel/task_work.c:189 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0xc83/0x2a50 kernel/exit.c:863 do_group_exit+0x141/0x310 kernel/exit.c:985 __do_sys_exit_group kernel/exit.c:996 [inline] __se_sys_exit_group kernel/exit.c:994 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:994 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xcb Memory state around the buggy address: ffff888115f47a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888115f47b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888115f47b80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff888115f47c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888115f47c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================