================================================================== BUG: KMSAN: uninit-value in inet_peer_gc net/ipv4/inetpeer.c:163 [inline] BUG: KMSAN: uninit-value in inet_getpeer+0x1567/0x1e70 net/ipv4/inetpeer.c:228 CPU: 0 PID: 11062 Comm: syz-executor6 Not tainted 4.16.0+ #87 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x185/0x1d0 lib/dump_stack.c:53 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:683 inet_peer_gc net/ipv4/inetpeer.c:163 [inline] inet_getpeer+0x1567/0x1e70 net/ipv4/inetpeer.c:228 inet_getpeer_v4 include/net/inetpeer.h:110 [inline] ip4_frag_init+0x4d1/0x740 net/ipv4/ip_fragment.c:153 inet_frag_alloc net/ipv4/inet_fragment.c:369 [inline] inet_frag_create net/ipv4/inet_fragment.c:385 [inline] inet_frag_find+0x7da/0x1610 net/ipv4/inet_fragment.c:418 ip_find net/ipv4/ip_fragment.c:275 [inline] ip_defrag+0x4ba/0x6860 net/ipv4/ip_fragment.c:676 ip_check_defrag+0x76b/0xd90 net/ipv4/ip_fragment.c:724 packet_rcv_fanout+0x2a8/0x8d0 net/packet/af_packet.c:1447 deliver_skb net/core/dev.c:1897 [inline] deliver_ptype_list_skb net/core/dev.c:1912 [inline] __netif_receive_skb_core+0x314a/0x4a90 net/core/dev.c:4545 __netif_receive_skb net/core/dev.c:4627 [inline] netif_receive_skb_internal+0x49d/0x630 net/core/dev.c:4701 netif_receive_skb+0x230/0x240 net/core/dev.c:4725 tun_rx_batched drivers/net/tun.c:1555 [inline] tun_get_user+0x740f/0x7c60 drivers/net/tun.c:1962 tun_chr_write_iter+0x1d4/0x330 drivers/net/tun.c:1990 do_iter_readv_writev+0x84d/0xa00 include/linux/fs.h:1776 do_iter_write+0x30d/0xd40 fs/read_write.c:932 vfs_writev fs/read_write.c:977 [inline] do_writev+0x3c9/0x830 fs/read_write.c:1012 SYSC_writev+0x9b/0xb0 fs/read_write.c:1085 SyS_writev+0x56/0x80 fs/read_write.c:1082 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x3d/0xa2 RIP: 0033:0x455831 RSP: 002b:00007fbbb9188ba0 EFLAGS: 00000293 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 000000000000004a RCX: 0000000000455831 RDX: 0000000000000001 RSI: 00007fbbb9188bf0 RDI: 00000000000000fc RBP: 0000000020000180 R08: 00000000000000fc R09: 0000000000000000 R10: 000000000000004a R11: 0000000000000293 R12: 00000000ffffffff R13: 00000000000006ac R14: 00000000006fe0c0 R15: 0000000000000000 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline] kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:188 kmsan_kmalloc+0x94/0x100 mm/kmsan/kmsan.c:314 kmem_cache_alloc+0xaab/0xb90 mm/slub.c:2756 inet_getpeer+0xed8/0x1e70 net/ipv4/inetpeer.c:210 inet_getpeer_v4 include/net/inetpeer.h:110 [inline] ip4_frag_init+0x4d1/0x740 net/ipv4/ip_fragment.c:153 inet_frag_alloc net/ipv4/inet_fragment.c:369 [inline] inet_frag_create net/ipv4/inet_fragment.c:385 [inline] inet_frag_find+0x7da/0x1610 net/ipv4/inet_fragment.c:418 ip_find net/ipv4/ip_fragment.c:275 [inline] ip_defrag+0x4ba/0x6860 net/ipv4/ip_fragment.c:676 ip_check_defrag+0x76b/0xd90 net/ipv4/ip_fragment.c:724 packet_rcv_fanout+0x2a8/0x8d0 net/packet/af_packet.c:1447 deliver_skb net/core/dev.c:1897 [inline] deliver_ptype_list_skb net/core/dev.c:1912 [inline] __netif_receive_skb_core+0x314a/0x4a90 net/core/dev.c:4545 __netif_receive_skb net/core/dev.c:4627 [inline] netif_receive_skb_internal+0x49d/0x630 net/core/dev.c:4701 netif_receive_skb+0x230/0x240 net/core/dev.c:4725 tun_rx_batched drivers/net/tun.c:1555 [inline] tun_get_user+0x740f/0x7c60 drivers/net/tun.c:1962 tun_chr_write_iter+0x1d4/0x330 drivers/net/tun.c:1990 do_iter_readv_writev+0x84d/0xa00 include/linux/fs.h:1776 do_iter_write+0x30d/0xd40 fs/read_write.c:932 vfs_writev fs/read_write.c:977 [inline] do_writev+0x3c9/0x830 fs/read_write.c:1012 SYSC_writev+0x9b/0xb0 fs/read_write.c:1085 SyS_writev+0x56/0x80 fs/read_write.c:1082 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x3d/0xa2 ==================================================================