dccp_invalid_packet: P.Data Offset(4) too small ================================================================== BUG: KMSAN: uninit-value in ____nf_conntrack_find net/netfilter/nf_conntrack_core.c:539 [inline] BUG: KMSAN: uninit-value in __nf_conntrack_find_get+0xc15/0x2190 net/netfilter/nf_conntrack_core.c:573 CPU: 1 PID: 8103 Comm: syz-executor1 Not tainted 4.18.0-rc4+ #27 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+0x185/0x1e0 lib/dump_stack.c:113 kmsan_report+0x195/0x2c0 mm/kmsan/kmsan.c:982 __msan_warning+0x7d/0xe0 mm/kmsan/kmsan_instr.c:645 ____nf_conntrack_find net/netfilter/nf_conntrack_core.c:539 [inline] __nf_conntrack_find_get+0xc15/0x2190 net/netfilter/nf_conntrack_core.c:573 resolve_normal_ct net/netfilter/nf_conntrack_core.c:1331 [inline] nf_conntrack_in+0x1674/0x2070 net/netfilter/nf_conntrack_core.c:1416 ipv4_conntrack_in+0xc3/0xf0 net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c:150 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] NF_HOOK include/linux/netfilter.h:285 [inline] ip_rcv+0x1225/0x14f0 net/ipv4/ip_input.c:492 __netif_receive_skb_core+0x4a7a/0x4fc0 net/core/dev.c:4628 __netif_receive_skb net/core/dev.c:4693 [inline] netif_receive_skb_internal+0x475/0x660 net/core/dev.c:4767 netif_receive_skb+0x246/0x270 net/core/dev.c:4791 tun_rx_batched drivers/net/tun.c:1571 [inline] tun_get_user+0x80f6/0x89c0 drivers/net/tun.c:1981 tun_chr_write_iter+0x1d4/0x330 drivers/net/tun.c:2009 do_iter_readv_writev+0x81a/0xac0 include/linux/fs.h:1787 do_iter_write+0x30d/0xd50 fs/read_write.c:959 vfs_writev fs/read_write.c:1004 [inline] do_writev+0x3d8/0x860 fs/read_write.c:1039 __do_sys_writev fs/read_write.c:1112 [inline] __se_sys_writev fs/read_write.c:1109 [inline] __x64_sys_writev+0xe1/0x120 fs/read_write.c:1109 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x455971 Code: 75 14 b8 14 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 54 bb fb ff c3 48 83 ec 08 e8 da 2c 00 00 48 89 04 24 b8 14 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 23 2d 00 00 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007f16e2331ba0 EFLAGS: 00000293 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 000000000000fdef RCX: 0000000000455971 RDX: 0000000000000001 RSI: 00007f16e2331bf0 RDI: 00000000000000fc RBP: 000000002018f000 R08: 00000000000000fc R09: 0000000000000000 R10: 000000000000fdef R11: 0000000000000293 R12: 00000000ffffffff R13: 00000000004c20a6 R14: 00000000004d3ae0 R15: 0000000000000001 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:256 [inline] kmsan_save_stack mm/kmsan/kmsan.c:271 [inline] kmsan_internal_chain_origin+0x13c/0x240 mm/kmsan/kmsan.c:573 __msan_chain_origin+0x76/0xd0 mm/kmsan/kmsan_instr.c:483 __nf_conntrack_confirm+0x2700/0x3f70 net/netfilter/nf_conntrack_core.c:793 nf_conntrack_confirm include/net/netfilter/nf_conntrack_core.h:71 [inline] ipv4_confirm+0x15b/0x650 net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c:143 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] NF_HOOK include/linux/netfilter.h:285 [inline] ip_local_deliver+0x3b9/0x510 net/ipv4/ip_input.c:256 dst_input include/net/dst.h:450 [inline] ip_rcv_finish+0xa1b/0x1d10 net/ipv4/ip_input.c:396 NF_HOOK include/linux/netfilter.h:287 [inline] ip_rcv+0x12d4/0x14f0 net/ipv4/ip_input.c:492 __netif_receive_skb_core+0x4a7a/0x4fc0 net/core/dev.c:4628 __netif_receive_skb net/core/dev.c:4693 [inline] netif_receive_skb_internal+0x475/0x660 net/core/dev.c:4767 netif_receive_skb+0x246/0x270 net/core/dev.c:4791 tun_rx_batched drivers/net/tun.c:1571 [inline] tun_get_user+0x80f6/0x89c0 drivers/net/tun.c:1981 tun_chr_write_iter+0x1d4/0x330 drivers/net/tun.c:2009 do_iter_readv_writev+0x81a/0xac0 include/linux/fs.h:1787 do_iter_write+0x30d/0xd50 fs/read_write.c:959 vfs_writev fs/read_write.c:1004 [inline] do_writev+0x3d8/0x860 fs/read_write.c:1039 __do_sys_writev fs/read_write.c:1112 [inline] __se_sys_writev fs/read_write.c:1109 [inline] __x64_sys_writev+0xe1/0x120 fs/read_write.c:1109 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:256 [inline] kmsan_internal_poison_shadow+0xc8/0x1d0 mm/kmsan/kmsan.c:181 kmsan_kmalloc+0xa1/0x120 mm/kmsan/kmsan_hooks.c:91 kmem_cache_alloc+0xad2/0xbb0 mm/slub.c:2739 __nf_conntrack_alloc+0x166/0x670 net/netfilter/nf_conntrack_core.c:1137 init_conntrack+0x635/0x2840 net/netfilter/nf_conntrack_core.c:1219 resolve_normal_ct net/netfilter/nf_conntrack_core.c:1333 [inline] nf_conntrack_in+0x1812/0x2070 net/netfilter/nf_conntrack_core.c:1416 ipv4_conntrack_in+0xc3/0xf0 net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c:150 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] NF_HOOK include/linux/netfilter.h:285 [inline] ip_rcv+0x1225/0x14f0 net/ipv4/ip_input.c:492 __netif_receive_skb_core+0x4a7a/0x4fc0 net/core/dev.c:4628 __netif_receive_skb net/core/dev.c:4693 [inline] netif_receive_skb_internal+0x475/0x660 net/core/dev.c:4767 netif_receive_skb+0x246/0x270 net/core/dev.c:4791 tun_rx_batched drivers/net/tun.c:1571 [inline] tun_get_user+0x80f6/0x89c0 drivers/net/tun.c:1981 tun_chr_write_iter+0x1d4/0x330 drivers/net/tun.c:2009 do_iter_readv_writev+0x81a/0xac0 include/linux/fs.h:1787 do_iter_write+0x30d/0xd50 fs/read_write.c:959 vfs_writev fs/read_write.c:1004 [inline] do_writev+0x3d8/0x860 fs/read_write.c:1039 __do_sys_writev fs/read_write.c:1112 [inline] __se_sys_writev fs/read_write.c:1109 [inline] __x64_sys_writev+0xe1/0x120 fs/read_write.c:1109 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x63/0xe7 ==================================================================