================================================================== BUG: KASAN: use-after-free in __xfrm_policy_eval_candidates net/xfrm/xfrm_policy.c:2019 [inline] BUG: KASAN: use-after-free in xfrm_policy_eval_candidates net/xfrm/xfrm_policy.c:2053 [inline] BUG: KASAN: use-after-free in xfrm_policy_lookup_bytype+0xd27/0xdb0 net/xfrm/xfrm_policy.c:2113 Read of size 4 at addr ffff88805f56e0b4 by task syz-executor1/23300 CPU: 0 PID: 23300 Comm: syz-executor1 Not tainted 5.0.0-rc3+ #24 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+0x1db/0x2d0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 __asan_report_load4_noabort+0x14/0x20 mm/kasan/generic_report.c:134 __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+0xd27/0xdb0 net/xfrm/xfrm_policy.c:2113 xfrm_policy_lookup+0x7e/0x90 net/xfrm/xfrm_policy.c:2145 __xfrm_policy_check+0x1426/0x2b00 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] tcp_v6_rcv+0x3721/0x3870 net/ipv6/tcp_ipv6.c:1534 ip6_protocol_deliver_rcu+0x3aa/0x1940 net/ipv6/ip6_input.c:394 ip6_input_finish+0x84/0x170 net/ipv6/ip6_input.c:434 NF_HOOK include/linux/netfilter.h:289 [inline] NF_HOOK include/linux/netfilter.h:283 [inline] ip6_input+0xf9/0x600 net/ipv6/ip6_input.c:443 dst_input include/net/dst.h:450 [inline] ip6_rcv_finish+0x177/0x330 net/ipv6/ip6_input.c:76 NF_HOOK include/linux/netfilter.h:289 [inline] NF_HOOK include/linux/netfilter.h:283 [inline] ipv6_rcv+0x113/0x650 net/ipv6/ip6_input.c:272 __netif_receive_skb_one_core+0x160/0x210 net/core/dev.c:4973 __netif_receive_skb+0x2c/0x1c0 net/core/dev.c:5083 process_backlog+0x206/0x750 net/core/dev.c:5923 napi_poll net/core/dev.c:6346 [inline] net_rx_action+0x76d/0x1930 net/core/dev.c:6412 __do_softirq+0x30b/0xb11 kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1027 do_softirq.part.0+0x11a/0x170 kernel/softirq.c:337 do_softirq kernel/softirq.c:329 [inline] __local_bh_enable_ip+0x211/0x270 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:696 [inline] ip6_finish_output2+0xca9/0x28e0 net/ipv6/ip6_output.c:121 ip6_finish_output+0x577/0xc30 net/ipv6/ip6_output.c:154 NF_HOOK_COND include/linux/netfilter.h:278 [inline] ip6_output+0x23c/0xa00 net/ipv6/ip6_output.c:171 dst_output include/net/dst.h:444 [inline] NF_HOOK include/linux/netfilter.h:289 [inline] NF_HOOK include/linux/netfilter.h:283 [inline] ip6_xmit+0xee1/0x24a0 net/ipv6/ip6_output.c:275 inet6_csk_xmit+0x358/0x650 net/ipv6/inet6_connection_sock.c:139 __tcp_transmit_skb+0x1ae2/0x3ab0 net/ipv4/tcp_output.c:1156 tcp_transmit_skb net/ipv4/tcp_output.c:1172 [inline] tcp_send_syn_data net/ipv4/tcp_output.c:3495 [inline] tcp_connect+0x22b4/0x4a50 net/ipv4/tcp_output.c:3534 tcp_v6_connect+0x19cf/0x2940 net/ipv6/tcp_ipv6.c:321 __inet_stream_connect+0x9a3/0x11b0 net/ipv4/af_inet.c:655 tcp_sendmsg_fastopen net/ipv4/tcp.c:1163 [inline] tcp_sendmsg_locked+0x297d/0x3e10 net/ipv4/tcp.c:1205 tcp_sendmsg+0x30/0x50 net/ipv4/tcp.c:1440 inet_sendmsg+0x1af/0x740 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xdd/0x130 net/socket.c:631 __sys_sendto+0x387/0x5f0 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+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458089 Code: 6d b7 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 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f2af53cec78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 0000000000458089 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 000000000073bf00 R08: 000000002031e000 R09: 000000000000001c R10: 0000000020000004 R11: 0000000000000246 R12: 00007f2af53cf6d4 R13: 00000000004c56f0 R14: 00000000004d94c0 R15: 00000000ffffffff Allocated by task 7830: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_kmalloc mm/kasan/common.c:496 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:469 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:504 kmem_cache_alloc_trace+0x151/0x760 mm/slab.c:3609 kmalloc include/linux/slab.h:545 [inline] syslog_print kernel/printk/printk.c:1302 [inline] do_syslog kernel/printk/printk.c:1475 [inline] do_syslog+0x5aa/0x17c0 kernel/printk/printk.c:1449 kmsg_read+0x8f/0xc0 fs/proc/kmsg.c:40 proc_reg_read+0x29a/0x3c0 fs/proc/inode.c:229 __vfs_read+0x116/0xb20 fs/read_write.c:416 vfs_read+0x194/0x3e0 fs/read_write.c:452 ksys_read+0x105/0x260 fs/read_write.c:578 __do_sys_read fs/read_write.c:588 [inline] __se_sys_read fs/read_write.c:586 [inline] __x64_sys_read+0x73/0xb0 fs/read_write.c:586 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 7830: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:458 kasan_slab_free+0xe/0x10 mm/kasan/common.c:466 __cache_free mm/slab.c:3487 [inline] kfree+0xcf/0x230 mm/slab.c:3806 syslog_print kernel/printk/printk.c:1361 [inline] do_syslog kernel/printk/printk.c:1475 [inline] do_syslog+0x8c8/0x17c0 kernel/printk/printk.c:1449 kmsg_read+0x8f/0xc0 fs/proc/kmsg.c:40 proc_reg_read+0x29a/0x3c0 fs/proc/inode.c:229 __vfs_read+0x116/0xb20 fs/read_write.c:416 vfs_read+0x194/0x3e0 fs/read_write.c:452 ksys_read+0x105/0x260 fs/read_write.c:578 __do_sys_read fs/read_write.c:588 [inline] __se_sys_read fs/read_write.c:586 [inline] __x64_sys_read+0x73/0xb0 fs/read_write.c:586 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88805f56e000 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 180 bytes inside of 1024-byte region [ffff88805f56e000, ffff88805f56e400) The buggy address belongs to the page: page:ffffea00017d5b80 count:1 mapcount:0 mapping:ffff88812c3f0ac0 index:0xffff88805f56f680 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea000245e808 ffffea0002916408 ffff88812c3f0ac0 raw: ffff88805f56f680 ffff88805f56e000 0000000100000002 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88805f56df80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805f56e000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88805f56e080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805f56e100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805f56e180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================