================================================================== 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 ffff8880a8cb6e74 by task syz-executor3/21865 CPU: 0 PID: 21865 Comm: syz-executor3 Not tainted 5.0.0-rc3+ #21 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_check+0x190f/0x2b00 net/xfrm/xfrm_policy.c:3376 __xfrm_policy_check2 include/net/xfrm.h:1170 [inline] xfrm_policy_check include/net/xfrm.h:1175 [inline] xfrm6_policy_check include/net/xfrm.h:1185 [inline] dccp_v6_rcv+0xfab/0x1cef net/dccp/ipv6.c:775 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 dccp_transmit_skb+0x977/0x12c0 net/dccp/output.c:142 dccp_connect+0x39e/0x700 net/dccp/output.c:564 dccp_v6_connect+0xf8d/0x1ee0 net/dccp/ipv6.c:950 __inet_stream_connect+0x9a3/0x11b0 net/ipv4/af_inet.c:655 inet_stream_connect+0x58/0xa0 net/ipv4/af_inet.c:719 __sys_connect+0x357/0x490 net/socket.c:1664 __do_sys_connect net/socket.c:1675 [inline] __se_sys_connect net/socket.c:1672 [inline] __x64_sys_connect+0x73/0xb0 net/socket.c:1672 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458099 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:00007fd35814fc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458099 RDX: 000000000000001c RSI: 0000000020419000 RDI: 0000000000000007 RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd3581506d4 R13: 00000000004be4f7 R14: 00000000004ceb30 R15: 00000000ffffffff Allocated by task 20244: 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 __do_kmalloc mm/slab.c:3711 [inline] __kmalloc+0x15c/0x740 mm/slab.c:3720 kmalloc include/linux/slab.h:550 [inline] kzalloc include/linux/slab.h:740 [inline] crypto_create_tfm+0x88/0x310 crypto/api.c:464 crypto_alloc_tfm+0x104/0x2f0 crypto/api.c:543 crypto_alloc_skcipher+0x2d/0x40 crypto/skcipher.c:945 skcipher_bind+0x26/0x30 crypto/algif_skcipher.c:310 alg_bind+0x25d/0x570 crypto/af_alg.c:183 __sys_bind+0x30b/0x420 net/socket.c:1483 __do_sys_bind net/socket.c:1494 [inline] __se_sys_bind net/socket.c:1492 [inline] __x64_sys_bind+0x73/0xb0 net/socket.c:1492 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 20244: 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 kzfree+0x29/0x30 mm/slab_common.c:1589 crypto_destroy_tfm+0x158/0x300 crypto/api.c:584 crypto_free_skcipher include/crypto/skcipher.h:214 [inline] skcipher_release+0x1b/0x20 crypto/algif_skcipher.c:315 alg_do_release crypto/af_alg.c:119 [inline] alg_bind+0x3b7/0x570 crypto/af_alg.c:202 __sys_bind+0x30b/0x420 net/socket.c:1483 __do_sys_bind net/socket.c:1494 [inline] __se_sys_bind net/socket.c:1492 [inline] __x64_sys_bind+0x73/0xb0 net/socket.c:1492 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 ffff8880a8cb6dc0 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 180 bytes inside of 1024-byte region [ffff8880a8cb6dc0, ffff8880a8cb71c0) The buggy address belongs to the page: page:ffffea0002a32d80 count:1 mapcount:0 mapping:ffff88812c3f0ac0 index:0xffff8880a8cb7240 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea0002355908 ffffea000258f688 ffff88812c3f0ac0 raw: ffff8880a8cb7240 ffff8880a8cb6040 0000000100000002 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a8cb6d00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880a8cb6d80: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb >ffff8880a8cb6e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a8cb6e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a8cb6f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================