linux-kernel - [PATCH 4.19 51/57] net: geneve: check skb is large enough for IPv4/IPv6 header

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Message-Id: <20210426072822.301891397@linuxfoundation.org>
Date:   Mon, 26 Apr 2021 09:29:48 +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, Eric Dumazet <edumazet@...gle.com>,
        syzbot+2e406a9ac75bb71d4b7a@...kaller.appspotmail.com,
        Phillip Potter <phil@...lpotter.co.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 51/57] net: geneve: check skb is large enough for IPv4/IPv6 header

From: Phillip Potter <phil@...lpotter.co.uk>

[ Upstream commit 6628ddfec7580882f11fdc5c194a8ea781fdadfa ]

Check within geneve_xmit_skb/geneve6_xmit_skb that sk_buff structure
is large enough to include IPv4 or IPv6 header, and reject if not. The
geneve_xmit_skb portion and overall idea was contributed by Eric Dumazet.
Fixes a KMSAN-found uninit-value bug reported by syzbot at:
https://syzkaller.appspot.com/bug?id=abe95dc3e3e9667fc23b8d81f29ecad95c6f106f

Suggested-by: Eric Dumazet <edumazet@...gle.com>
Reported-by: syzbot+2e406a9ac75bb71d4b7a@...kaller.appspotmail.com
Signed-off-by: Phillip Potter <phil@...lpotter.co.uk>
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/geneve.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
index 2e2afc824a6a..ce6fecf421f8 100644
--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -839,6 +839,9 @@ static int geneve_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 	__be16 df;
 	int err;
 
+	if (!pskb_network_may_pull(skb, sizeof(struct iphdr)))
+		return -EINVAL;
+
 	sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 	rt = geneve_get_v4_rt(skb, dev, gs4, &fl4, info,
 			      geneve->info.key.tp_dst, sport);
@@ -882,6 +885,9 @@ static int geneve6_xmit_skb(struct sk_buff *skb, struct net_device *dev,
 	__be16 sport;
 	int err;
 
+	if (!pskb_network_may_pull(skb, sizeof(struct ipv6hdr)))
+		return -EINVAL;
+
 	sport = udp_flow_src_port(geneve->net, skb, 1, USHRT_MAX, true);
 	dst = geneve_get_v6_dst(skb, dev, gs6, &fl6, info,
 				geneve->info.key.tp_dst, sport);
-- 
2.30.2