linux-kernel - [PATCH] net: dsa: ksz: Check proper trim in ksz_common

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Message-Id: <20221129140809.2755960-1-artem.chernyshev@red-soft.ru>
Date:   Tue, 29 Nov 2022 17:08:09 +0300
From:   Artem Chernyshev <artem.chernyshev@...-soft.ru>
To:     Woojung Huh <woojung.huh@...rochip.com>,
        Andrew Lunn <andrew@...n.ch>
Cc:     Artem Chernyshev <artem.chernyshev@...-soft.ru>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, lvc-project@...uxtesting.org
Subject: [PATCH] net: dsa: ksz: Check proper trim in ksz_common_rcv()

Return NULL if we got unexpected value from skb_trim_rcsum()

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: bafe9ba7d908 ("net: dsa: ksz: Factor out common tag code")
Signed-off-by: Artem Chernyshev <artem.chernyshev@...-soft.ru>
---
 net/dsa/tag_ksz.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/dsa/tag_ksz.c b/net/dsa/tag_ksz.c
index 38fa19c1e2d5..429250298ac4 100644
--- a/net/dsa/tag_ksz.c
+++ b/net/dsa/tag_ksz.c
@@ -21,7 +21,8 @@ static struct sk_buff *ksz_common_rcv(struct sk_buff *skb,
 	if (!skb->dev)
 		return NULL;
 
-	pskb_trim_rcsum(skb, skb->len - len);
+	if (pskb_trim_rcsum(skb, skb->len - len))
+		return NULL;
 
 	dsa_default_offload_fwd_mark(skb);
 
-- 
2.30.3