linux-kernel - [PATCH 4.4 03/21] netfilter: nfnetlink_acct: validate NFACCT

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Message-Id: <20190809134241.707489370@linuxfoundation.org>
Date:   Fri,  9 Aug 2019 15:45:07 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Phil Turnbull <phil.turnbull@...cle.com>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.4 03/21] netfilter: nfnetlink_acct: validate NFACCT_QUOTA parameter

[ Upstream commit eda3fc50daa93b08774a18d51883c5a5d8d85e15 ]

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@...cle.com>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/netfilter/nfnetlink_acct.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/net/netfilter/nfnetlink_acct.c
+++ b/net/netfilter/nfnetlink_acct.c
@@ -97,6 +97,8 @@ nfnl_acct_new(struct sock *nfnl, struct
 			return -EINVAL;
 		if (flags & NFACCT_F_OVERQUOTA)
 			return -EINVAL;
+		if ((flags & NFACCT_F_QUOTA) && !tb[NFACCT_QUOTA])
+			return -EINVAL;
 
 		size += sizeof(u64);
 	}