===================================================== BUG: KMSAN: uninit-value in sctp_sf_ootb+0x7f1/0xcd0 net/sctp/sm_statefuns.c:3703 sctp_sf_ootb+0x7f1/0xcd0 net/sctp/sm_statefuns.c:3703 sctp_do_sm+0x199/0x9b90 net/sctp/sm_sideeffect.c:1167 sctp_endpoint_bh_rcv+0xc2d/0xf80 net/sctp/endpointola.c:402 sctp_inq_push+0x238/0x2b0 net/sctp/inqueue.c:80 sctp_rcv+0x39fe/0x3bd0 net/sctp/input.c:258 sctp4_rcv+0x3e/0x50 net/sctp/protocol.c:1154 ip_protocol_deliver_rcu+0x201/0xaf0 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x2a5/0x3a0 net/ipv4/ip_input.c:233 NF_HOOK include/linux/netfilter.h:307 [inline] ip_local_deliver+0x278/0x4a0 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:461 [inline] ip_rcv_finish net/ipv4/ip_input.c:444 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] ip_rcv+0x527/0x7c0 net/ipv4/ip_input.c:564 __netif_receive_skb_one_core net/core/dev.c:5485 [inline] __netif_receive_skb+0x1b3/0x5d0 net/core/dev.c:5599 netif_receive_skb_internal+0x53/0x340 net/core/dev.c:5685 netif_receive_skb+0x35/0x350 net/core/dev.c:5744 tun_rx_batched+0x837/0x930 tun_get_user+0x3b3b/0x4260 drivers/net/tun.c:1995 tun_chr_write_iter+0x3ab/0x5d0 drivers/net/tun.c:2025 call_write_iter include/linux/fs.h:2187 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x830/0x1570 fs/read_write.c:578 ksys_write+0x21b/0x4e0 fs/read_write.c:631 __do_sys_write fs/read_write.c:643 [inline] __se_sys_write fs/read_write.c:640 [inline] __x64_sys_write+0x8f/0xd0 fs/read_write.c:640 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Uninit was created at: slab_post_alloc_hook mm/slab.h:732 [inline] slab_alloc_node mm/slub.c:3258 [inline] __kmalloc_node_track_caller+0x814/0x1250 mm/slub.c:4970 kmalloc_reserve net/core/skbuff.c:358 [inline] __alloc_skb+0x346/0xcf0 net/core/skbuff.c:430 alloc_skb include/linux/skbuff.h:1257 [inline] alloc_skb_with_frags+0xb9/0xba0 net/core/skbuff.c:6017 sock_alloc_send_pskb+0xaa8/0xc30 net/core/sock.c:2665 tun_alloc_skb drivers/net/tun.c:1520 [inline] tun_get_user+0x173d/0x4260 drivers/net/tun.c:1833 tun_chr_write_iter+0x3ab/0x5d0 drivers/net/tun.c:2025 call_write_iter include/linux/fs.h:2187 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x830/0x1570 fs/read_write.c:578 ksys_write+0x21b/0x4e0 fs/read_write.c:631 __do_sys_write fs/read_write.c:643 [inline] __se_sys_write fs/read_write.c:640 [inline] __x64_sys_write+0x8f/0xd0 fs/read_write.c:640 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd CPU: 0 PID: 3605 Comm: syz-executor.0 Not tainted 6.0.0-rc4-syzkaller-00438-g4367d178d9eb #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 =====================================================