From: Artem Chernyshev artem.chernyshev@red-soft.ru
[ 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@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.r... Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- 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);