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netfilter: nfnetlink_acct: validate NFACCT_QUOTA parameter 

If a quota bit is set in NFACCT_FLAGS but the NFACCT_QUOTA parameter is
missing then a NULL pointer dereference is triggered. CAP_NET_ADMIN is
required to trigger the bug.

Signed-off-by: Phil Turnbull <phil.turnbull@oracle.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Phil Turnbull 2016-05-03 16:39:19 -04:00 committed by Pablo Neira Ayuso
parent cec5913c15
commit eda3fc50da
1 changed files with 2 additions and 0 deletions
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2
net/netfilter/nfnetlink_acct.c
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@ -96,6 +96,8 @@ static int nfnl_acct_new(struct net *net, struct sock *nfnl,
return -EINVAL; return -EINVAL;
if (flags & NFACCT_F_OVERQUOTA) if (flags & NFACCT_F_OVERQUOTA)
return -EINVAL; return -EINVAL;
if ((flags & NFACCT_F_QUOTA) && !tb[NFACCT_QUOTA])
return -EINVAL;
size += sizeof(u64); size += sizeof(u64);
} }