================================================================== BUG: KMSAN: uninit-value in _decode_session6+0x645/0x1650 net/ipv6/xfrm6_policy.c:149 CPU: 1 PID: 14418 Comm: syz-executor5 Not tainted 4.19.0-rc4+ #58 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+0x2f6/0x430 lib/dump_stack.c:113 kmsan_report+0x183/0x2b0 mm/kmsan/kmsan.c:917 __msan_warning+0x70/0xc0 mm/kmsan/kmsan_instr.c:500 _decode_session6+0x645/0x1650 net/ipv6/xfrm6_policy.c:149 __xfrm_decode_session+0x156/0x200 net/xfrm/xfrm_policy.c:2299 xfrm_decode_session_reverse include/net/xfrm.h:1239 [inline] icmpv6_route_lookup net/ipv6/icmp.c:372 [inline] icmp6_send+0x2d01/0x3840 net/ipv6/icmp.c:551 icmpv6_send+0xe5/0x110 net/ipv6/ip6_icmp.c:43 ip6_fragment+0xc6a/0x5200 net/ipv6/ip6_output.c:861 ip6_finish_output+0xacb/0xc70 net/ipv6/ip6_output.c:152 NF_HOOK_COND include/linux/netfilter.h:276 [inline] ip6_output+0x572/0x6a0 net/ipv6/ip6_output.c:171 dst_output include/net/dst.h:444 [inline] ip6_local_out+0x164/0x1d0 net/ipv6/output_core.c:176 ip6_send_skb net/ipv6/ip6_output.c:1697 [inline] ip6_push_pending_frames+0x218/0x4d0 net/ipv6/ip6_output.c:1717 rawv6_push_pending_frames net/ipv6/raw.c:616 [inline] rawv6_sendmsg+0x45f7/0x5680 net/ipv6/raw.c:933 inet_sendmsg+0x4c5/0x7d0 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg net/socket.c:631 [inline] sock_write_iter+0x3b8/0x470 net/socket.c:900 do_iter_readv_writev+0x874/0xa50 include/linux/fs.h:1802 do_iter_write+0x302/0xd80 fs/read_write.c:959 vfs_writev fs/read_write.c:1004 [inline] do_writev+0x3be/0x820 fs/read_write.c:1039 __do_sys_writev fs/read_write.c:1112 [inline] __se_sys_writev+0x9b/0xb0 fs/read_write.c:1109 __x64_sys_writev+0x4a/0x70 fs/read_write.c:1109 do_syscall_64+0xb8/0x100 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x457579 Code: 1d 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 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f3aa153fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457579 RDX: 10000000000000fa RSI: 0000000020000180 RDI: 0000000000000003 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3aa15406d4 R13: 00000000004c30c9 R14: 00000000004d9078 R15: 00000000ffffffff Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:255 [inline] kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:180 kmsan_kmalloc+0x98/0x100 mm/kmsan/kmsan_hooks.c:91 kmsan_slab_alloc+0x10/0x20 mm/kmsan/kmsan_hooks.c:100 slab_post_alloc_hook mm/slab.h:446 [inline] slab_alloc_node mm/slub.c:2718 [inline] __kmalloc_node_track_caller+0xb55/0x1380 mm/slub.c:4351 __kmalloc_reserve net/core/skbuff.c:138 [inline] pskb_expand_head+0x326/0x1e10 net/core/skbuff.c:1461 __pskb_pull_tail+0x1e3/0x21b0 net/core/skbuff.c:1895 pskb_may_pull include/linux/skbuff.h:2127 [inline] nf_ct_frag6_gather+0xff2/0x58b0 net/ipv6/netfilter/nf_conntrack_reasm.c:555 ipv6_defrag+0x501/0x5c0 net/ipv6/netfilter/nf_defrag_ipv6_hooks.c:69 nf_hook_entry_hookfn include/linux/netfilter.h:119 [inline] nf_hook_slow+0x15d/0x3e0 net/netfilter/core.c:511 nf_hook include/linux/netfilter.h:242 [inline] __ip6_local_out+0x562/0x730 net/ipv6/output_core.c:164 ip6_local_out+0xa4/0x1d0 net/ipv6/output_core.c:174 ip6_send_skb net/ipv6/ip6_output.c:1697 [inline] ip6_push_pending_frames+0x218/0x4d0 net/ipv6/ip6_output.c:1717 rawv6_push_pending_frames net/ipv6/raw.c:616 [inline] rawv6_sendmsg+0x45f7/0x5680 net/ipv6/raw.c:933 inet_sendmsg+0x4c5/0x7d0 net/ipv4/af_inet.c:798 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg net/socket.c:631 [inline] sock_write_iter+0x3b8/0x470 net/socket.c:900 do_iter_readv_writev+0x874/0xa50 include/linux/fs.h:1802 do_iter_write+0x302/0xd80 fs/read_write.c:959 vfs_writev fs/read_write.c:1004 [inline] do_writev+0x3be/0x820 fs/read_write.c:1039 __do_sys_writev fs/read_write.c:1112 [inline] __se_sys_writev+0x9b/0xb0 fs/read_write.c:1109 __x64_sys_writev+0x4a/0x70 fs/read_write.c:1109 do_syscall_64+0xb8/0x100 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 ==================================================================