From: Artem Chernyshev <artem.chernyshev@xxxxxxxxxxx>
[ Upstream commit 3d8fdcbf1f42e2bb9ae8b8c0b6f202278c788a22 ]
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@xxxxxxxxxxx>
Reviewed-by: Vladimir Oltean <olteanv@xxxxxxxxx>
Reviewed-by: Florian Fainelli <f.fainelli@xxxxxxxxx>
Link: https://lore.kernel.org/r/20221201140032.26746-1-artem.chernyshev@xxxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
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 fa1d60d13ad9..6795dd017499 100644
--- a/net/dsa/tag_ksz.c
+++ b/net/dsa/tag_ksz.c
@@ -22,7 +22,8 @@ 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);
--
2.35.1
