================================================================== BUG: KASAN: slab-out-of-bounds in memcpy include/linux/string.h:345 [inline] BUG: KASAN: slab-out-of-bounds in dh_pack_data crypto/dh_helper.c:21 [inline] BUG: KASAN: slab-out-of-bounds in crypto_dh_encode_key+0x609/0x830 crypto/dh_helper.c:62 Write of size 843 at addr ffff8801aa829b55 by task syz-executor6/7373 CPU: 1 PID: 7373 Comm: syz-executor6 Not tainted 4.18.0-rc7-next-20180803+ #31 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+0x1c9/0x2b4 lib/dump_stack.c:113 print_address_description+0x6c/0x20b mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.7+0x242/0x30d mm/kasan/report.c:412 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267 memcpy+0x37/0x50 mm/kasan/kasan.c:303 memcpy include/linux/string.h:345 [inline] dh_pack_data crypto/dh_helper.c:21 [inline] crypto_dh_encode_key+0x609/0x830 crypto/dh_helper.c:62 __keyctl_dh_compute+0x707/0x1c00 security/keys/dh.c:316 keyctl_dh_compute+0xc5/0x11f security/keys/dh.c:427 __do_sys_keyctl security/keys/keyctl.c:1741 [inline] __se_sys_keyctl security/keys/keyctl.c:1637 [inline] __x64_sys_keyctl+0x12a/0x3b0 security/keys/keyctl.c:1637 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x456b29 Code: fd b4 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 b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fc35759ec78 EFLAGS: 00000246 ORIG_RAX: 00000000000000fa RAX: ffffffffffffffda RBX: 00007fc35759f6d4 RCX: 0000000000456b29 RDX: 0000000020000380 RSI: 0000000020000340 RDI: 0000000000000017 RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000000003dd R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d16a0 R14: 00000000004c7069 R15: 0000000000000000 Allocated by task 7373: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 __do_kmalloc mm/slab.c:3718 [inline] __kmalloc+0x14e/0x760 mm/slab.c:3727 kmalloc include/linux/slab.h:518 [inline] __keyctl_dh_compute+0x6e1/0x1c00 security/keys/dh.c:311 keyctl_dh_compute+0xc5/0x11f security/keys/dh.c:427 __do_sys_keyctl security/keys/keyctl.c:1741 [inline] __se_sys_keyctl security/keys/keyctl.c:1637 [inline] __x64_sys_keyctl+0x12a/0x3b0 security/keys/keyctl.c:1637 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 6190: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kfree+0xd9/0x260 mm/slab.c:3813 skb_free_head+0x99/0xc0 net/core/skbuff.c:550 skb_release_data+0x6a4/0x880 net/core/skbuff.c:570 skb_release_all+0x4a/0x60 net/core/skbuff.c:627 __kfree_skb net/core/skbuff.c:641 [inline] kfree_skb+0x19d/0x580 net/core/skbuff.c:659 ip_tunnel_xmit+0x838/0x3af1 net/ipv4/ip_tunnel.c:788 __gre_xmit+0x5e1/0x980 net/ipv4/ip_gre.c:449 gre_tap_xmit+0x314/0x590 net/ipv4/ip_gre.c:772 __netdev_start_xmit include/linux/netdevice.h:4280 [inline] netdev_start_xmit include/linux/netdevice.h:4289 [inline] xmit_one net/core/dev.c:3207 [inline] dev_hard_start_xmit+0x26c/0xc30 net/core/dev.c:3223 sch_direct_xmit+0x486/0x1140 net/sched/sch_generic.c:327 qdisc_restart net/sched/sch_generic.c:390 [inline] __qdisc_run+0x619/0x19f0 net/sched/sch_generic.c:398 qdisc_run include/net/pkt_sched.h:120 [inline] __dev_xmit_skb net/core/dev.c:3402 [inline] __dev_queue_xmit+0x1424/0x38c0 net/core/dev.c:3761 dev_queue_xmit+0x17/0x20 net/core/dev.c:3826 neigh_resolve_output+0x681/0xaf0 net/core/neighbour.c:1364 neigh_output include/net/neighbour.h:483 [inline] ip6_finish_output2+0xc95/0x2820 net/ipv6/ip6_output.c:120 ip6_finish_output+0x5fe/0xbc0 net/ipv6/ip6_output.c:154 NF_HOOK_COND include/linux/netfilter.h:276 [inline] ip6_output+0x234/0x9d0 net/ipv6/ip6_output.c:171 dst_output include/net/dst.h:444 [inline] NF_HOOK include/linux/netfilter.h:287 [inline] ndisc_send_skb+0x100d/0x1570 net/ipv6/ndisc.c:491 ndisc_send_rs+0x134/0x6e0 net/ipv6/ndisc.c:685 addrconf_rs_timer+0x314/0x690 net/ipv6/addrconf.c:3819 call_timer_fn+0x242/0x970 kernel/time/timer.c:1326 expire_timers kernel/time/timer.c:1363 [inline] __run_timers+0x7dc/0xcb0 kernel/time/timer.c:1682 run_timer_softirq+0x1d/0x40 kernel/time/timer.c:1695 __do_softirq+0x2e8/0xb17 kernel/softirq.c:292 The buggy address belongs to the object at ffff8801aa829b40 which belongs to the cache kmalloc-1024 of size 1024 The buggy address is located 21 bytes inside of 1024-byte region [ffff8801aa829b40, ffff8801aa829f40) The buggy address belongs to the page: page:ffffea0006aa0a00 count:1 mapcount:0 mapping:ffff8801dac00ac0 index:0x0 compound_mapcount: 0 flags: 0x2fffc0000008100(slab|head) raw: 02fffc0000008100 ffffea0006ad5488 ffffea0007271688 ffff8801dac00ac0 raw: 0000000000000000 ffff8801aa828040 0000000100000007 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801aa829d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8801aa829e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8801aa829e80: 00 00 00 05 fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8801aa829f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801aa829f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================