4.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Zhouyang Jia <jiazhouyang09@xxxxxxxxx> [ Upstream commit 349b71d6f427ff8211adf50839dbbff3f27c1805 ] When pskb_trim_rcsum fails, the lack of error-handling code may cause unexpected results. This patch adds error-handling code after calling pskb_trim_rcsum. Signed-off-by: Zhouyang Jia <jiazhouyang09@xxxxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- net/dsa/tag_trailer.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/net/dsa/tag_trailer.c +++ b/net/dsa/tag_trailer.c @@ -79,7 +79,8 @@ static struct sk_buff *trailer_rcv(struc if (unlikely(ds->cpu_port_mask & BIT(source_port))) return NULL; - pskb_trim_rcsum(skb, skb->len - 4); + if (pskb_trim_rcsum(skb, skb->len - 4)) + return NULL; skb->dev = ds->ports[source_port].netdev;
