================================================================== BUG: KASAN: slab-out-of-bounds in __xfrm_policy_eval_candidates net/xfrm/xfrm_policy.c:2019 [inline] BUG: KASAN: slab-out-of-bounds in xfrm_policy_eval_candidates net/xfrm/xfrm_policy.c:2053 [inline] BUG: KASAN: slab-out-of-bounds in xfrm_policy_lookup_bytype+0xe52/0xe70 net/xfrm/xfrm_policy.c:2113 Read of size 4 at addr ffff8881976d52f4 by task syz-executor3/4007 CPU: 0 PID: 4007 Comm: syz-executor3 Not tainted 4.20.0-rc7+ #358 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d3/0x2c6 lib/dump_stack.c:113 print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.9+0x242/0x309 mm/kasan/report.c:412 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report.c:432 __xfrm_policy_eval_candidates net/xfrm/xfrm_policy.c:2019 [inline] xfrm_policy_eval_candidates net/xfrm/xfrm_policy.c:2053 [inline] xfrm_policy_lookup_bytype+0xe52/0xe70 net/xfrm/xfrm_policy.c:2113 xfrm_policy_lookup+0x7e/0x80 net/xfrm/xfrm_policy.c:2145 __xfrm_policy_check+0x14f0/0x2c40 net/xfrm/xfrm_policy.c:3354 __xfrm_policy_check2 include/net/xfrm.h:1166 [inline] xfrm_policy_check include/net/xfrm.h:1175 [inline] xfrm6_policy_check include/net/xfrm.h:1185 [inline] rawv6_rcv+0x65f/0x1340 net/ipv6/raw.c:423 ipv6_raw_deliver net/ipv6/raw.c:223 [inline] raw6_local_deliver+0x511/0xc70 net/ipv6/raw.c:239 ip6_protocol_deliver_rcu+0x3de/0x1940 net/ipv6/ip6_input.c:344 ip6_input_finish+0x84/0x170 net/ipv6/ip6_input.c:434 NF_HOOK include/linux/netfilter.h:289 [inline] ip6_input+0xe9/0x600 net/ipv6/ip6_input.c:443 ip6_mc_input+0x514/0x11c0 net/ipv6/ip6_input.c:537 dst_input include/net/dst.h:450 [inline] ip6_rcv_finish+0x17a/0x330 net/ipv6/ip6_input.c:76 NF_HOOK include/linux/netfilter.h:289 [inline] ipv6_rcv+0x115/0x640 net/ipv6/ip6_input.c:272 __netif_receive_skb_one_core+0x14d/0x200 net/core/dev.c:4973 __netif_receive_skb+0x2c/0x1e0 net/core/dev.c:5083 process_backlog+0x217/0x760 net/core/dev.c:5923 napi_poll net/core/dev.c:6346 [inline] net_rx_action+0x7c5/0x1950 net/core/dev.c:6412 __do_softirq+0x30c/0xb2e kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1027 do_softirq.part.13+0x126/0x160 kernel/softirq.c:337 do_softirq+0x19/0x20 kernel/softirq.c:340 netif_rx_ni+0x521/0x870 net/core/dev.c:4569 dev_loopback_xmit+0x287/0x8c0 net/core/dev.c:3576 NF_HOOK include/linux/netfilter.h:289 [inline] ip6_finish_output2+0x193a/0x2930 net/ipv6/ip6_output.c:84 ip6_finish_output+0x583/0xc50 net/ipv6/ip6_output.c:154 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip6_output+0x232/0x9d0 net/ipv6/ip6_output.c:171 dst_output include/net/dst.h:444 [inline] ip6_local_out+0xc5/0x1b0 net/ipv6/output_core.c:176 ip6_send_skb+0xbc/0x340 net/ipv6/ip6_output.c:1727 ip6_push_pending_frames+0xc5/0xf0 net/ipv6/ip6_output.c:1747 rawv6_push_pending_frames net/ipv6/raw.c:615 [inline] rawv6_sendmsg+0x3a3e/0x4b40 net/ipv6/raw.c:945 inet_sendmsg+0x1a1/0x690 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:631 __sys_sendto+0x3d7/0x670 net/socket.c:1788 __do_sys_sendto net/socket.c:1800 [inline] __se_sys_sendto net/socket.c:1796 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1796 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457669 Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f648ee8cc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000457669 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 000000000072bf00 R08: 0000000020000240 R09: 000000000000001c R10: 0000000000000000 R11: 0000000000000246 R12: 00007f648ee8d6d4 R13: 00000000004c4539 R14: 00000000004d75a8 R15: 00000000ffffffff Allocated by task 3701: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc_node+0x144/0x730 mm/slab.c:3644 __alloc_skb+0x119/0x760 net/core/skbuff.c:196 alloc_skb include/linux/skbuff.h:1011 [inline] tcp_collapse+0x551/0x1080 net/ipv4/tcp_input.c:4907 tcp_prune_queue net/ipv4/tcp_input.c:5078 [inline] tcp_try_rmem_schedule+0xcb0/0x1c20 net/ipv4/tcp_input.c:4471 tcp_data_queue_ofo net/ipv4/tcp_input.c:4492 [inline] tcp_data_queue+0x1131/0x4790 net/ipv4/tcp_input.c:4798 tcp_rcv_established+0xd73/0x2250 net/ipv4/tcp_input.c:5656 tcp_v4_do_rcv+0x62f/0x8e0 net/ipv4/tcp_ipv4.c:1538 sk_backlog_rcv include/net/sock.h:932 [inline] __release_sock+0x12f/0x390 net/core/sock.c:2284 release_sock+0xad/0x2c0 net/core/sock.c:2797 sk_wait_data+0x271/0x630 net/core/sock.c:2326 tcp_recvmsg+0x212d/0x3430 net/ipv4/tcp.c:2079 inet_recvmsg+0x181/0x6d0 net/ipv4/af_inet.c:830 sock_recvmsg_nosec net/socket.c:794 [inline] sock_recvmsg+0xd0/0x110 net/socket.c:801 ___sys_recvmsg+0x2b6/0x680 net/socket.c:2278 __sys_recvmsg+0x11a/0x280 net/socket.c:2327 __do_sys_recvmsg net/socket.c:2337 [inline] __se_sys_recvmsg net/socket.c:2334 [inline] __x64_sys_recvmsg+0x78/0xb0 net/socket.c:2334 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 3701: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kmem_cache_free+0x83/0x290 mm/slab.c:3760 kfree_skbmem+0x14e/0x230 net/core/skbuff.c:585 __kfree_skb+0x1d/0x20 net/core/skbuff.c:642 tcp_collapse_one+0x114/0x1e0 net/ipv4/tcp_input.c:4820 tcp_collapse+0xb5e/0x1080 net/ipv4/tcp_input.c:4937 tcp_prune_queue net/ipv4/tcp_input.c:5078 [inline] tcp_try_rmem_schedule+0xcb0/0x1c20 net/ipv4/tcp_input.c:4471 tcp_data_queue_ofo net/ipv4/tcp_input.c:4492 [inline] tcp_data_queue+0x1131/0x4790 net/ipv4/tcp_input.c:4798 tcp_rcv_established+0xd73/0x2250 net/ipv4/tcp_input.c:5656 tcp_v4_do_rcv+0x62f/0x8e0 net/ipv4/tcp_ipv4.c:1538 sk_backlog_rcv include/net/sock.h:932 [inline] __release_sock+0x12f/0x390 net/core/sock.c:2284 release_sock+0xad/0x2c0 net/core/sock.c:2797 sk_wait_data+0x271/0x630 net/core/sock.c:2326 tcp_recvmsg+0x212d/0x3430 net/ipv4/tcp.c:2079 inet_recvmsg+0x181/0x6d0 net/ipv4/af_inet.c:830 sock_recvmsg_nosec net/socket.c:794 [inline] sock_recvmsg+0xd0/0x110 net/socket.c:801 ___sys_recvmsg+0x2b6/0x680 net/socket.c:2278 __sys_recvmsg+0x11a/0x280 net/socket.c:2327 __do_sys_recvmsg net/socket.c:2337 [inline] __se_sys_recvmsg net/socket.c:2334 [inline] __x64_sys_recvmsg+0x78/0xb0 net/socket.c:2334 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8881976d51c0 which belongs to the cache skbuff_head_cache of size 224 The buggy address is located 84 bytes to the right of 224-byte region [ffff8881976d51c0, ffff8881976d52a0) The buggy address belongs to the page: page:ffffea00065db540 count:1 mapcount:0 mapping:ffff8881d9be8780 index:0x0 flags: 0x2fffc0000000200(slab) raw: 02fffc0000000200 ffffea0006ec3988 ffffea0006e3b948 ffff8881d9be8780 raw: 0000000000000000 ffff8881976d5080 000000010000000c 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881976d5180: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff8881976d5200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881976d5280: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8881976d5300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881976d5380: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ==================================================================