================================================================== BUG: KASAN: slab-out-of-bounds in xfrm_policy_inexact_list_reinsert+0x5b0/0x660 net/xfrm/xfrm_policy.c:855 Read of size 1 at addr ffff8881e1d1cbd8 by task syz.5.799/3399 CPU: 1 PID: 3399 Comm: syz.5.799 Tainted: G W 5.4.290-syzkaller #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 __asan_report_load1_noabort+0x14/0x20 mm/kasan/generic_report.c:129 xfrm_policy_inexact_list_reinsert+0x5b0/0x660 net/xfrm/xfrm_policy.c:855 xfrm_policy_inexact_node_merge net/xfrm/xfrm_policy.c:987 [inline] xfrm_policy_inexact_insert_node+0x923/0xb10 net/xfrm/xfrm_policy.c:1043 xfrm_policy_inexact_alloc_chain+0x4ec/0xaf0 net/xfrm/xfrm_policy.c:1159 xfrm_policy_inexact_insert+0x6a/0x1160 net/xfrm/xfrm_policy.c:1202 xfrm_policy_insert+0xe7/0x940 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+0x72/0x90 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+0xa46/0xd00 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_sys_sendmsg net/socket.c:2415 [inline] __se_sys_sendmsg net/socket.c:2413 [inline] __x64_sys_sendmsg+0x7f/0x90 net/socket.c:2413 do_syscall_64+0xd8/0x170 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 RIP: 0033:0x7f11086c2169 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:00007f1106d2b038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f11088e9fa0 RCX: 00007f11086c2169 RDX: 0000000000000000 RSI: 0000200000000580 RDI: 0000000000000006 RBP: 00007f1108744a68 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f11088e9fa0 R15: 00007ffe7525a188 Allocated by task 3399: 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 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:543 __kmalloc+0x129/0x2e0 mm/slub.c:3913 kmalloc include/linux/slab.h:561 [inline] sk_prot_alloc+0xc2/0x440 net/core/sock.c:1622 sk_alloc+0x39/0x310 net/core/sock.c:1680 pfkey_create+0x12c/0x650 net/key/af_key.c:154 __sock_create+0x3ce/0x790 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+0x7a/0x90 net/socket.c:1527 do_syscall_64+0xd8/0x170 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 Freed by task 341: 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 kasan_slab_free+0xe/0x10 mm/kasan/common.c:496 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+0x123/0x360 mm/slub.c:4071 skb_free_head net/core/skbuff.c:601 [inline] skb_release_data+0x525/0x650 net/core/skbuff.c:621 skb_release_all net/core/skbuff.c:675 [inline] __kfree_skb+0x50/0x70 net/core/skbuff.c:689 sk_eat_skb include/net/sock.h:2568 [inline] tcp_recvmsg+0x174c/0x35b0 net/ipv4/tcp.c:2183 inet_recvmsg+0x158/0x510 net/ipv4/af_inet.c:851 sock_recvmsg_nosec net/socket.c:891 [inline] sock_recvmsg net/socket.c:909 [inline] sock_read_iter+0x34e/0x430 net/socket.c:987 call_read_iter include/linux/fs.h:1985 [inline] new_sync_read fs/read_write.c:414 [inline] __vfs_read+0x5cd/0x730 fs/read_write.c:427 vfs_read+0x14c/0x370 fs/read_write.c:461 ksys_read+0x199/0x2c0 fs/read_write.c:587 __do_sys_read fs/read_write.c:597 [inline] __se_sys_read fs/read_write.c:595 [inline] __x64_sys_read+0x7b/0x90 fs/read_write.c:595 do_syscall_64+0xd8/0x170 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 The buggy address belongs to the object at ffff8881e1d1c800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 984 bytes inside of 1024-byte region [ffff8881e1d1c800, ffff8881e1d1cc00) The buggy address belongs to the page: page:ffffea0007874600 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 0x1f2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_MEMALLOC|__GFP_HARDWALL) set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook mm/page_alloc.c:2165 [inline] prep_new_page+0x192/0x370 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+0x3b/0x400 mm/slub.c:343 allocate_slab mm/slub.c:1683 [inline] new_slab+0x98/0x430 mm/slub.c:1749 new_slab_objects mm/slub.c:2505 [inline] ___slab_alloc+0x2e0/0x460 mm/slub.c:2667 __slab_alloc+0x63/0xa0 mm/slub.c:2707 slab_alloc_node mm/slub.c:2792 [inline] slab_alloc mm/slub.c:2837 [inline] __kmalloc_track_caller+0x17f/0x2c0 mm/slub.c:4449 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0xbc/0x4f0 net/core/skbuff.c:210 __napi_alloc_skb+0x146/0x580 net/core/skbuff.c:516 napi_alloc_skb include/linux/skbuff.h:2913 [inline] page_to_skb+0x3c/0x950 drivers/net/virtio_net.c:412 receive_mergeable drivers/net/virtio_net.c:1001 [inline] receive_buf+0xde0/0x51c0 drivers/net/virtio_net.c:1111 virtnet_receive drivers/net/virtio_net.c:1403 [inline] virtnet_poll+0x5f9/0x1250 drivers/net/virtio_net.c:1512 napi_poll net/core/dev.c:6386 [inline] net_rx_action+0x53f/0x1160 net/core/dev.c:6454 __do_softirq+0x24a/0x687 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x19a/0x1c0 kernel/softirq.c:413 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_slab+0x21d/0x2d0 mm/slub.c:1774 free_slab mm/slub.c:1789 [inline] discard_slab mm/slub.c:1795 [inline] unfreeze_partials+0x162/0x190 mm/slub.c:2288 put_cpu_partial+0xbf/0x180 mm/slub.c:2324 __slab_free+0x2a5/0x370 mm/slub.c:2971 do_slab_free mm/slub.c:3068 [inline] ___cache_free+0xc1/0xd0 mm/slub.c:3087 qlink_free+0x23/0x30 mm/kasan/quarantine.c:148 qlist_free_all+0x47/0xb0 mm/kasan/quarantine.c:167 quarantine_reduce+0x1e4/0x230 mm/kasan/quarantine.c:260 __kasan_kmalloc+0x41/0x210 mm/kasan/common.c:507 kasan_slab_alloc+0xe/0x10 mm/kasan/common.c:537 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2829 [inline] slab_alloc mm/slub.c:2837 [inline] kmem_cache_alloc+0xe0/0x260 mm/slub.c:2842 getname_flags+0xba/0x520 fs/namei.c:141 user_path_at_empty+0x2d/0x50 fs/namei.c:2703 user_path_at include/linux/namei.h:49 [inline] vfs_statx+0x115/0x210 fs/stat.c:187 Memory state around the buggy address: ffff8881e1d1ca80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881e1d1cb00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881e1d1cb80: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ^ ffff8881e1d1cc00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8881e1d1cc80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================