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BUG: KMSAN: uninit-value in mptcp_incoming_options+0xc93/0x3a80 net/mptcp/options.c:1197
 mptcp_incoming_options+0xc93/0x3a80 net/mptcp/options.c:1197
 tcp_data_queue+0xb4/0x7f20 net/ipv4/tcp_input.c:5141
 tcp_rcv_established+0x1132/0x2600 net/ipv4/tcp_input.c:6155
 tcp_v4_do_rcv+0x8a8/0xff0 net/ipv4/tcp_ipv4.c:1906
 tcp_v4_rcv+0x4ce0/0x51a0 net/ipv4/tcp_ipv4.c:2329
 ip_protocol_deliver_rcu+0x264/0x1300 net/ipv4/ip_input.c:205
 ip_local_deliver_finish+0x2b8/0x440 net/ipv4/ip_input.c:233
 NF_HOOK include/linux/netfilter.h:314 [inline]
 ip_local_deliver+0x21f/0x490 net/ipv4/ip_input.c:254
 dst_input include/net/dst.h:461 [inline]
 ip_rcv_finish net/ipv4/ip_input.c:449 [inline]
 NF_HOOK include/linux/netfilter.h:314 [inline]
 ip_rcv+0x476/0x770 net/ipv4/ip_input.c:569
 __netif_receive_skb_one_core net/core/dev.c:5529 [inline]
 __netif_receive_skb+0x1a6/0x5a0 net/core/dev.c:5643
 process_backlog+0x480/0x8b0 net/core/dev.c:5971
 __napi_poll+0xe3/0x970 net/core/dev.c:6533
 napi_poll net/core/dev.c:6602 [inline]
 net_rx_action+0x884/0x16d0 net/core/dev.c:6735
 __do_softirq+0x1b7/0x7c3 kernel/softirq.c:553
 invoke_softirq kernel/softirq.c:427 [inline]
 __irq_exit_rcu kernel/softirq.c:632 [inline]
 irq_exit_rcu+0x69/0x120 kernel/softirq.c:644
 sysvec_apic_timer_interrupt+0x7a/0x90 arch/x86/kernel/apic/apic.c:1076
 asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:645
 kmsan_get_metadata+0xc/0x2c0 mm/kmsan/shadow.c:125
 kmsan_get_shadow_origin_ptr+0x38/0xa0 mm/kmsan/shadow.c:97
 get_shadow_origin_ptr mm/kmsan/instrumentation.c:36 [inline]
 __msan_metadata_ptr_for_load_4+0x24/0x40 mm/kmsan/instrumentation.c:91
 leave_rcu fs/namei.c:676 [inline]
 try_to_unlazy+0x659/0x950 fs/namei.c:786
 complete_walk+0x201/0x590 fs/namei.c:891
 path_lookupat+0x34e/0x6f0 fs/namei.c:2490
 filename_lookup+0x22e/0x740 fs/namei.c:2512
 vfs_statx+0xe2/0x660 fs/stat.c:244
 vfs_fstatat+0x1f2/0x270 fs/stat.c:299
 __do_sys_newfstatat fs/stat.c:463 [inline]
 __se_sys_newfstatat+0x64/0x870 fs/stat.c:457
 __x64_sys_newfstatat+0xbd/0x110 fs/stat.c:457
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

Uninit was stored to memory at:
 mptcp_parse_option net/mptcp/options.c:110 [inline]
 mptcp_get_options+0x2d86/0x2e60 net/mptcp/options.c:396
 mptcp_incoming_options+0x124/0x3a80 net/mptcp/options.c:1139
 tcp_data_queue+0xb4/0x7f20 net/ipv4/tcp_input.c:5141
 tcp_rcv_established+0x1132/0x2600 net/ipv4/tcp_input.c:6155
 tcp_v4_do_rcv+0x8a8/0xff0 net/ipv4/tcp_ipv4.c:1906
 tcp_v4_rcv+0x4ce0/0x51a0 net/ipv4/tcp_ipv4.c:2329
 ip_protocol_deliver_rcu+0x264/0x1300 net/ipv4/ip_input.c:205
 ip_local_deliver_finish+0x2b8/0x440 net/ipv4/ip_input.c:233
 NF_HOOK include/linux/netfilter.h:314 [inline]
 ip_local_deliver+0x21f/0x490 net/ipv4/ip_input.c:254
 dst_input include/net/dst.h:461 [inline]
 ip_rcv_finish net/ipv4/ip_input.c:449 [inline]
 NF_HOOK include/linux/netfilter.h:314 [inline]
 ip_rcv+0x476/0x770 net/ipv4/ip_input.c:569
 __netif_receive_skb_one_core net/core/dev.c:5529 [inline]
 __netif_receive_skb+0x1a6/0x5a0 net/core/dev.c:5643
 process_backlog+0x480/0x8b0 net/core/dev.c:5971
 __napi_poll+0xe3/0x970 net/core/dev.c:6533
 napi_poll net/core/dev.c:6602 [inline]
 net_rx_action+0x884/0x16d0 net/core/dev.c:6735
 __do_softirq+0x1b7/0x7c3 kernel/softirq.c:553

Local variable mp_opt created at:
 mptcp_incoming_options+0x9b/0x3a80 net/mptcp/options.c:1116
 tcp_data_queue+0xb4/0x7f20 net/ipv4/tcp_input.c:5141

CPU: 1 PID: 4444 Comm: udevd Not tainted 6.7.0-rc3-syzkaller-00033-g3b47bc037bd4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
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