===================================================== BUG: KMSAN: uninit-value in ip6_parse_tlv+0xa4e/0xf80 net/ipv6/exthdrs.c:169 CPU: 0 PID: 14796 Comm: syz-executor.4 Not tainted 5.11.0-rc7-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+0x21c/0x280 lib/dump_stack.c:120 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:118 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197 ip6_parse_tlv+0xa4e/0xf80 net/ipv6/exthdrs.c:169 ipv6_destopt_rcv+0x630/0xe80 net/ipv6/exthdrs.c:308 ip6_protocol_deliver_rcu+0x1402/0x25e0 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+0x12b/0x390 net/ipv6/ip6_input.c:483 ip6_mc_input+0xc77/0x12f0 net/ipv6/ip6_input.c:577 dst_input include/net/dst.h:447 [inline] ip6_rcv_finish+0x5fc/0x7f0 net/ipv6/ip6_input.c:76 NF_HOOK include/linux/netfilter.h:301 [inline] ipv6_rcv+0x1d1/0x460 net/ipv6/ip6_input.c:307 __netif_receive_skb_one_core net/core/dev.c:5323 [inline] __netif_receive_skb+0x1ec/0x640 net/core/dev.c:5437 process_backlog+0x517/0xbd0 net/core/dev.c:6328 napi_poll+0x428/0x15c0 net/core/dev.c:6806 net_rx_action+0x34c/0xd30 net/core/dev.c:6889 __do_softirq+0x1b9/0x715 kernel/softirq.c:343 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x6e/0x90 arch/x86/kernel/irq_64.c:77 do_softirq+0xed/0x150 kernel/softirq.c:246 netif_rx_ni+0x90/0x2c0 net/core/dev.c:4847 dev_loopback_xmit+0x5ad/0x7b0 net/core/dev.c:3864 NF_HOOK include/linux/netfilter.h:301 [inline] ip6_finish_output2+0x695/0x2a40 net/ipv6/ip6_output.c:81 __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:441 [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+0x40ea/0x46a0 net/ipv6/raw.c:956 inet_sendmsg+0x15b/0x1d0 net/ipv4/af_inet.c:817 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] sock_write_iter+0x585/0x680 net/socket.c:999 call_write_iter include/linux/fs.h:1901 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x1083/0x1b00 fs/read_write.c:605 ksys_write+0x275/0x500 fs/read_write.c:658 __do_sys_write fs/read_write.c:670 [inline] __se_sys_write+0x92/0xb0 fs/read_write.c:667 __ia32_sys_write+0x4a/0x70 fs/read_write.c:667 do_syscall_32_irqs_on arch/x86/entry/common.c:79 [inline] __do_fast_syscall_32+0x102/0x160 arch/x86/entry/common.c:141 do_fast_syscall_32+0x6a/0xc0 arch/x86/entry/common.c:166 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:209 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf7fad549 Code: 03 74 c0 01 10 05 03 74 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 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f55a75fc EFLAGS: 00000296 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000000000 RDX: 0000000000000000 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:121 [inline] kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76 slab_alloc_node mm/slub.c:2907 [inline] __kmalloc_node_track_caller+0xa37/0x1430 mm/slub.c:4527 __kmalloc_reserve net/core/skbuff.c:142 [inline] __alloc_skb+0x2f8/0xb30 net/core/skbuff.c:210 alloc_skb include/linux/skbuff.h:1099 [inline] alloc_skb_with_frags+0x1f3/0xc10 net/core/skbuff.c:5894 sock_alloc_send_pskb+0xdc1/0xf90 net/core/sock.c:2348 sock_alloc_send_skb+0xca/0xe0 net/core/sock.c:2365 __ip6_append_data+0x553e/0x7260 net/ipv6/ip6_output.c:1620 ip6_append_data+0x44b/0x6e0 net/ipv6/ip6_output.c:1796 rawv6_sendmsg+0x2aea/0x46a0 net/ipv6/raw.c:949 inet_sendmsg+0x15b/0x1d0 net/ipv4/af_inet.c:817 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg net/socket.c:672 [inline] sock_write_iter+0x585/0x680 net/socket.c:999 call_write_iter include/linux/fs.h:1901 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x1083/0x1b00 fs/read_write.c:605 ksys_write+0x275/0x500 fs/read_write.c:658 __do_sys_write fs/read_write.c:670 [inline] __se_sys_write+0x92/0xb0 fs/read_write.c:667 __ia32_sys_write+0x4a/0x70 fs/read_write.c:667 do_syscall_32_irqs_on arch/x86/entry/common.c:79 [inline] __do_fast_syscall_32+0x102/0x160 arch/x86/entry/common.c:141 do_fast_syscall_32+0x6a/0xc0 arch/x86/entry/common.c:166 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:209 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c =====================================================