linux-kernel - Re: [syzbot] [net?] WARNING in mpls_gso

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Message-ID: <20240222031539.2038610-1-lizhi.xu@windriver.com>
Date: Thu, 22 Feb 2024 11:15:39 +0800
From: Lizhi Xu <lizhi.xu@...driver.com>
To: <syzbot+99d15fcdb0132a1e1a82@...kaller.appspotmail.com>
CC: <syzkaller-bugs@...glegroups.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [syzbot] [net?] WARNING in mpls_gso_segment

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git main

diff --git a/net/mpls/mpls_gso.c b/net/mpls/mpls_gso.c
index 533d082f0701..2ab24b2fd90f 100644
--- a/net/mpls/mpls_gso.c
+++ b/net/mpls/mpls_gso.c
@@ -25,11 +25,11 @@ static struct sk_buff *mpls_gso_segment(struct sk_buff *skb,
 	netdev_features_t mpls_features;
 	u16 mac_len = skb->mac_len;
 	__be16 mpls_protocol;
-	unsigned int mpls_hlen;
+	int mpls_hlen;
 
 	skb_reset_network_header(skb);
 	mpls_hlen = skb_inner_network_header(skb) - skb_network_header(skb);
-	if (unlikely(!mpls_hlen || mpls_hlen % MPLS_HLEN))
+	if (unlikely(mpls_hlen <= 0 || mpls_hlen % MPLS_HLEN))
 		goto out;
 	if (unlikely(!pskb_may_pull(skb, mpls_hlen)))
 		goto out;