===================================================== BUG: KMSAN: uninit-value in ip6_parse_tlv+0xa4a/0xf80 net/ipv6/exthdrs.c:169 CPU: 1 PID: 12355 Comm: syz-executor.3 Not tainted 5.9.0-rc4-syzkaller #0 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+0x21c/0x280 lib/dump_stack.c:118 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:122 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:201 ip6_parse_tlv+0xa4a/0xf80 net/ipv6/exthdrs.c:169 ipv6_destopt_rcv+0x630/0xe80 net/ipv6/exthdrs.c:308 ip6_protocol_deliver_rcu+0x14a2/0x2660 net/ipv6/ip6_input.c:433 ip6_input_finish net/ipv6/ip6_input.c:474 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ip6_input+0x2dd/0x370 net/ipv6/ip6_input.c:483 dst_input include/net/dst.h:449 [inline] ip6_rcv_finish+0x5fc/0x7f0 net/ipv6/ip6_input.c:76 NF_HOOK include/linux/netfilter.h:301 [inline] ipv6_rcv+0x3bb/0x460 net/ipv6/ip6_input.c:307 __netif_receive_skb_one_core net/core/dev.c:5286 [inline] __netif_receive_skb+0x265/0x670 net/core/dev.c:5400 process_backlog+0x50d/0xba0 net/core/dev.c:6242 napi_poll+0x443/0x1100 net/core/dev.c:6688 net_rx_action+0x35c/0xd40 net/core/dev.c:6758 __do_softirq+0x2ea/0x7f5 kernel/softirq.c:299 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706 __run_on_irqstack arch/x86/include/asm/irq_stack.h:23 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:50 [inline] do_softirq_own_stack+0x7c/0xa0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:396 [inline] __irq_exit_rcu+0x226/0x270 kernel/softirq.c:426 irq_exit_rcu+0xe/0x10 kernel/softirq.c:438 sysvec_apic_timer_interrupt+0x118/0x140 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:599 RIP: 0010:is_bad_asm_addr mm/kmsan/kmsan_instr.c:22 [inline] RIP: 0010:__msan_instrument_asm_store+0x9e/0x120 mm/kmsan/kmsan_instr.c:76 Code: f0 ff ff ff 7f 00 00 48 39 d8 76 1e eb 7b ba 00 00 00 c0 48 8d 82 00 e0 ff 3f f6 81 53 04 00 00 08 48 0f 45 c2 48 39 d8 77 5f <48> 89 df 4c 89 f6 31 d2 e8 15 18 00 00 48 85 c0 74 4d 9c 8f 45 d8 RSP: 0018:ffff88810a9271e8 EFLAGS: 00000203 RAX: 00000000ffffe000 RBX: ffff88810a927230 RCX: ffff88803c6c3d80 RDX: 00000000c0000000 RSI: 0000000000000008 RDI: ffff88810a927230 RBP: ffff88810a927210 R08: ffffea000000000f R09: ffff88812fffa000 R10: 0000000000000004 R11: 0000000000000000 R12: ffff88803c6c4770 R13: 0000000000000200 R14: 0000000000000008 R15: 0000000000000000 native_save_fl arch/x86/include/asm/irqflags.h:29 [inline] arch_local_save_flags arch/x86/include/asm/irqflags.h:79 [inline] arch_local_irq_save arch/x86/include/asm/irqflags.h:120 [inline] do_softirq kernel/softirq.c:339 [inline] __local_bh_enable_ip+0xf7/0x1d0 kernel/softirq.c:196 local_bh_enable+0x36/0x40 include/linux/bottom_half.h:32 rcu_read_unlock_bh include/linux/rcupdate.h:723 [inline] ip6_finish_output2+0x24b4/0x2a70 net/ipv6/ip6_output.c:118 __ip6_finish_output+0x9c0/0xa90 net/ipv6/ip6_output.c:143 ip6_finish_output+0x14b/0x4b0 net/ipv6/ip6_output.c:153 NF_HOOK_COND include/linux/netfilter.h:290 [inline] ip6_output+0x68d/0x7f0 net/ipv6/ip6_output.c:176 dst_output include/net/dst.h:443 [inline] ip6_local_out+0x17b/0x1e0 net/ipv6/output_core.c:179 ip6_send_skb net/ipv6/ip6_output.c:1867 [inline] ip6_push_pending_frames+0x252/0x5b0 net/ipv6/ip6_output.c:1887 rawv6_push_pending_frames net/ipv6/raw.c:613 [inline] rawv6_sendmsg+0x42fe/0x4740 net/ipv6/raw.c:956 inet_sendmsg+0x15b/0x1d0 net/ipv4/af_inet.c:817 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg net/socket.c:671 [inline] ____sys_sendmsg+0xc82/0x1240 net/socket.c:2353 ___sys_sendmsg net/socket.c:2407 [inline] __sys_sendmmsg+0x808/0xf70 net/socket.c:2490 __compat_sys_sendmmsg net/compat.c:361 [inline] __do_compat_sys_sendmmsg net/compat.c:368 [inline] __se_compat_sys_sendmmsg+0xcd/0xf0 net/compat.c:365 __ia32_compat_sys_sendmmsg+0x56/0x70 net/compat.c:365 do_syscall_32_irqs_on arch/x86/entry/common.c:80 [inline] __do_fast_syscall_32+0x129/0x180 arch/x86/entry/common.c:139 do_fast_syscall_32+0x6a/0xc0 arch/x86/entry/common.c:162 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:205 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7fdf549 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 002b:00000000f55d90cc EFLAGS: 00000296 ORIG_RAX: 0000000000000159 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020007e40 RDX: 0000000000000001 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:143 [inline] kmsan_internal_poison_shadow+0x66/0xd0 mm/kmsan/kmsan.c:126 kmsan_slab_alloc+0x8a/0xe0 mm/kmsan/kmsan_hooks.c:80 slab_alloc_node mm/slub.c:2907 [inline] __kmalloc_node_track_caller+0x9aa/0x12f0 mm/slub.c:4511 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0x35f/0xb30 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1094 [inline] alloc_skb_with_frags+0x1f2/0xc10 net/core/skbuff.c:5771 sock_alloc_send_pskb+0xc83/0xe50 net/core/sock.c:2348 sock_alloc_send_skb+0xca/0xe0 net/core/sock.c:2365 __ip6_append_data+0x4fbf/0x71b0 net/ipv6/ip6_output.c:1583 ip6_append_data+0x44b/0x6e0 net/ipv6/ip6_output.c:1759 rawv6_sendmsg+0x2cfe/0x4740 net/ipv6/raw.c:949 inet_sendmsg+0x15b/0x1d0 net/ipv4/af_inet.c:817 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg net/socket.c:671 [inline] ____sys_sendmsg+0xc82/0x1240 net/socket.c:2353 ___sys_sendmsg net/socket.c:2407 [inline] __sys_sendmmsg+0x808/0xf70 net/socket.c:2490 __compat_sys_sendmmsg net/compat.c:361 [inline] __do_compat_sys_sendmmsg net/compat.c:368 [inline] __se_compat_sys_sendmmsg+0xcd/0xf0 net/compat.c:365 __ia32_compat_sys_sendmmsg+0x56/0x70 net/compat.c:365 do_syscall_32_irqs_on arch/x86/entry/common.c:80 [inline] __do_fast_syscall_32+0x129/0x180 arch/x86/entry/common.c:139 do_fast_syscall_32+0x6a/0xc0 arch/x86/entry/common.c:162 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:205 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c =====================================================