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net: dsa: hellcreek: Check return value
[ Upstream commitd4edb50688
] Return NULL if we got unexpected value from skb_trim_rcsum() in hellcreek_rcv() Fixes:01ef09caad
("net: dsa: Add tag handling for Hirschmann Hellcreek switches") Signed-off-by: Artem Chernyshev <artem.chernyshev@red-soft.ru> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Reviewed-by: Kurt Kanzenbach <kurt@linutronix.de> Link: https://lore.kernel.org/r/20221201140032.26746-2-artem.chernyshev@red-soft.ru Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -49,7 +49,8 @@ static struct sk_buff *hellcreek_rcv(struct sk_buff *skb,
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return NULL;
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}
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pskb_trim_rcsum(skb, skb->len - HELLCREEK_TAG_LEN);
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if (pskb_trim_rcsum(skb, skb->len - HELLCREEK_TAG_LEN))
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return NULL;
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dsa_default_offload_fwd_mark(skb);
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