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net: dsa: hellcreek: Check return value

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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>
This commit is contained in:
Artem Chernyshev 2022-12-01 17:00:31 +03:00 committed by Jakub Kicinski
parent 3d8fdcbf1f
commit d4edb50688
1 changed files with 2 additions and 1 deletions
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3
net/dsa/tag_hellcreek.c
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@ -49,7 +49,8 @@ static struct sk_buff *hellcreek_rcv(struct sk_buff *skb,
return NULL;
}
pskb_trim_rcsum(skb, skb->len - HELLCREEK_TAG_LEN);
if (pskb_trim_rcsum(skb, skb->len - HELLCREEK_TAG_LEN))
return NULL;
dsa_default_offload_fwd_mark(skb);