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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
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