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netfilter: conntrack: dccp: treat SYNC/SYNCACK as invalid if no prior state 

When first DCCP packet is SYNC or SYNCACK, we insert a new conntrack
that has an un-initialized timeout value, i.e. such entry could be
reaped at any time.

Mark them as INVALID and only ignore SYNC/SYNCACK when connection had
an old state.

Reported-by: syzbot+6f18401420df260e37ed@syzkaller.appspotmail.com
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2018-07-17 21:03:15 +02:00 committed by Pablo Neira Ayuso
parent c6cc94df65
commit 6613b6173d
1 changed files with 4 additions and 4 deletions
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8
net/netfilter/nf_conntrack_proto_dccp.c
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@ -243,14 +243,14 @@ dccp_state_table[CT_DCCP_ROLE_MAX + 1][DCCP_PKT_SYNCACK + 1][CT_DCCP_MAX + 1] =
* We currently ignore Sync packets
*
* sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG,
sIV, sIG, sIG, sIG, sIG, sIG, sIG, sIG,
},
[DCCP_PKT_SYNCACK] = {
/*
* We currently ignore SyncAck packets
*
* sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG,
sIV, sIG, sIG, sIG, sIG, sIG, sIG, sIG,
},
},
[CT_DCCP_ROLE_SERVER] = {
@ -371,14 +371,14 @@ dccp_state_table[CT_DCCP_ROLE_MAX + 1][DCCP_PKT_SYNCACK + 1][CT_DCCP_MAX + 1] =
* We currently ignore Sync packets
*
* sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG,
sIV, sIG, sIG, sIG, sIG, sIG, sIG, sIG,
},
[DCCP_PKT_SYNCACK] = {
/*
* We currently ignore SyncAck packets
*
* sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG,
sIV, sIG, sIG, sIG, sIG, sIG, sIG, sIG,
},
},
};