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net: dsa: ksz: Check return value

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Return NULL if we got unexpected value from skb_trim_rcsum()
in ksz_common_rcv()

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@red-soft.ru>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20221201140032.26746-1-artem.chernyshev@red-soft.ru
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Artem Chernyshev 2022-12-01 17:00:30 +03:00 committed by Jakub Kicinski
parent a789c70c1d
commit 3d8fdcbf1f
1 changed files with 2 additions and 1 deletions
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3
net/dsa/tag_ksz.c
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@ -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);