===================================================== BUG: KMSAN: uninit-value in ip6_parse_tlv+0xa4e/0xf80 net/ipv6/exthdrs.c:169 CPU: 0 PID: 2878 Comm: syz-executor.0 Not tainted 5.12.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x24c/0x2e0 lib/dump_stack.c:120 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118 __msan_warning+0x5c/0xa0 mm/kmsan/kmsan_instr.c:197 ip6_parse_tlv+0xa4e/0xf80 net/ipv6/exthdrs.c:169 ipv6_parse_hopopts+0x559/0x8a0 net/ipv6/exthdrs.c:1038 ip6_rcv_core+0x1da8/0x22a0 net/ipv6/ip6_input.c:268 ipv6_rcv+0xe8/0x460 net/ipv6/ip6_input.c:294 __netif_receive_skb_one_core net/core/dev.c:5384 [inline] __netif_receive_skb+0x1ec/0x640 net/core/dev.c:5498 process_backlog+0x517/0xbd0 net/core/dev.c:6365 __napi_poll+0x13e/0xca0 net/core/dev.c:6912 napi_poll net/core/dev.c:6979 [inline] net_rx_action+0x726/0x14a0 net/core/dev.c:7065 __do_softirq+0x1b9/0x715 kernel/softirq.c:345 do_softirq+0x123/0x1c0 kernel/softirq.c:248 __local_bh_enable_ip+0xa1/0xb0 kernel/softirq.c:198 local_bh_enable+0x36/0x40 include/linux/bottom_half.h:32 rcu_read_unlock_bh include/linux/rcupdate.h:745 [inline] ip6_finish_output2+0x249c/0x2a40 net/ipv6/ip6_output.c:118 __ip6_finish_output+0xe04/0xee0 net/ipv6/ip6_output.c:182 ip6_finish_output+0x329/0x480 net/ipv6/ip6_output.c:192 NF_HOOK_COND include/linux/netfilter.h:290 [inline] ip6_output+0x4a4/0x7f0 net/ipv6/ip6_output.c:215 dst_output include/net/dst.h:448 [inline] ip6_local_out+0x17b/0x1e0 net/ipv6/output_core.c:179 ip6_send_skb net/ipv6/ip6_output.c:1904 [inline] ip6_push_pending_frames+0x243/0x570 net/ipv6/ip6_output.c:1924 rawv6_push_pending_frames net/ipv6/raw.c:613 [inline] rawv6_sendmsg+0x40f4/0x46b0 net/ipv6/raw.c:956 inet_sendmsg+0x15b/0x1d0 net/ipv4/af_inet.c:821 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg net/socket.c:674 [inline] ____sys_sendmsg+0xcfc/0x12f0 net/socket.c:2350 ___sys_sendmsg net/socket.c:2404 [inline] __sys_sendmmsg+0xa57/0x1010 net/socket.c:2490 __do_sys_sendmmsg net/socket.c:2519 [inline] __se_sys_sendmmsg+0xbd/0xe0 net/socket.c:2516 __x64_sys_sendmmsg+0x56/0x70 net/socket.c:2516 do_syscall_64+0x9f/0x140 arch/x86/entry/common.c:48 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665d9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe27fdf9188 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665d9 RDX: 03fffffffffffe9f RSI: 00000000200092c0 RDI: 0000000000000005 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038 R13: 0000000000a9fb1f R14: 00007fe27fdf9300 R15: 0000000000022000 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline] kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104 kmsan_slab_alloc+0x8e/0xe0 mm/kmsan/kmsan_hooks.c:76 slab_alloc_node mm/slub.c:2922 [inline] __kmalloc_node_track_caller+0xa4f/0x1470 mm/slub.c:4609 kmalloc_reserve net/core/skbuff.c:353 [inline] __alloc_skb+0x4dd/0xe90 net/core/skbuff.c:424 alloc_skb include/linux/skbuff.h:1103 [inline] __ip6_append_data+0x54dc/0x74d0 net/ipv6/ip6_output.c:1628 ip6_append_data+0x44b/0x6e0 net/ipv6/ip6_output.c:1796 rawv6_sendmsg+0x2af4/0x46b0 net/ipv6/raw.c:949 inet_sendmsg+0x15b/0x1d0 net/ipv4/af_inet.c:821 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg net/socket.c:674 [inline] ____sys_sendmsg+0xcfc/0x12f0 net/socket.c:2350 ___sys_sendmsg net/socket.c:2404 [inline] __sys_sendmmsg+0xa57/0x1010 net/socket.c:2490 __do_sys_sendmmsg net/socket.c:2519 [inline] __se_sys_sendmmsg+0xbd/0xe0 net/socket.c:2516 __x64_sys_sendmmsg+0x56/0x70 net/socket.c:2516 do_syscall_64+0x9f/0x140 arch/x86/entry/common.c:48 entry_SYSCALL_64_after_hwframe+0x44/0xae =====================================================