[lvc-project] [PATCH] net: dsa: ksz: Check proper trim in ksz_common_rcv()
Artem Chernyshev
artem.chernyshev at red-soft.ru
Tue Nov 29 17:08:09 MSK 2022
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 at red-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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