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BUG: KMSAN: uninit-value in __skb_flow_dissect+0x5153/0x8070 net/core/flow_dissector.c:1418
CPU: 1 PID: 15706 Comm: syz-executor.3 Not tainted 5.6.0-rc2-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+0x1c9/0x220 lib/dump_stack.c:118
 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:215
 __skb_flow_dissect+0x5153/0x8070 net/core/flow_dissector.c:1418
 skb_flow_dissect include/linux/skbuff.h:1295 [inline]
 fl_classify+0x3f5/0x1310 net/sched/cls_flower.c:319
 tcf_classify+0x280/0x700 net/sched/cls_api.c:1581
 hfsc_classify net/sched/sch_hfsc.c:1132 [inline]
 hfsc_enqueue+0x536/0x1700 net/sched/sch_hfsc.c:1539
 __dev_xmit_skb net/core/dev.c:3721 [inline]
 __dev_queue_xmit+0x20b3/0x4220 net/core/dev.c:4032
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4096
 neigh_resolve_output+0xab0/0xb40 net/core/neighbour.c:1487
 neigh_output include/net/neighbour.h:510 [inline]
 ip_finish_output2+0x1acc/0x2610 net/ipv4/ip_output.c:228
 __ip_finish_output+0xaa7/0xd80 net/ipv4/ip_output.c:306
 ip_finish_output+0x166/0x410 net/ipv4/ip_output.c:316
 NF_HOOK_COND include/linux/netfilter.h:296 [inline]
 ip_mc_output+0xfbf/0x1090 net/ipv4/ip_output.c:415
 dst_output include/net/dst.h:436 [inline]
 ip_local_out net/ipv4/ip_output.c:125 [inline]
 __ip_queue_xmit+0x1b5c/0x21a0 net/ipv4/ip_output.c:530
 sctp_v4_xmit+0x255/0x2f0 net/sctp/protocol.c:981
 sctp_packet_transmit+0x3e58/0x4370 net/sctp/output.c:629
 sctp_packet_singleton net/sctp/outqueue.c:773 [inline]
 sctp_outq_flush_ctrl net/sctp/outqueue.c:904 [inline]
 sctp_outq_flush+0x98d/0x5c70 net/sctp/outqueue.c:1186
 sctp_outq_uncork+0xd0/0xf0 net/sctp/outqueue.c:758
 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1793 [inline]
 sctp_side_effects net/sctp/sm_sideeffect.c:1185 [inline]
 sctp_do_sm+0x93a1/0x9a30 net/sctp/sm_sideeffect.c:1156
 sctp_primitive_ASSOCIATE+0x172/0x1a0 net/sctp/primitive.c:73
 sctp_sendmsg_to_asoc+0x2134/0x3150 net/sctp/socket.c:1826
 sctp_sendmsg+0x3172/0x4ef0 net/sctp/socket.c:2016
 inet_sendmsg+0x2d8/0x2e0 net/ipv4/af_inet.c:807
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg net/socket.c:672 [inline]
 ____sys_sendmsg+0x1056/0x1350 net/socket.c:2343
 ___sys_sendmsg net/socket.c:2397 [inline]
 __sys_sendmsg+0x451/0x5f0 net/socket.c:2430
 __do_sys_sendmsg net/socket.c:2439 [inline]
 __se_sys_sendmsg+0x97/0xb0 net/socket.c:2437
 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2437
 do_syscall_64+0xb8/0x160 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45c449
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffbe262cc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007ffbe262d6d4 RCX: 000000000045c449
RDX: 00000000000000fc RSI: 00000000200006c0 RDI: 0000000000000004
RBP: 000000000076bfc0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000008d9 R14: 00000000004cb3b2 R15: 000000000076bfcc

Local variable ----skb_key@fl_classify created at:
 fl_classify+0xd4/0x1310 net/sched/cls_flower.c:303
 fl_classify+0xd4/0x1310 net/sched/cls_flower.c:303
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