From: Aubrey.Li Date: Tue, 17 Apr 2007 19:40:20 +0000 (-0700) Subject: [NET]: Fix UDP checksum issue in net poll mode. X-Git-Tag: firefly_0821_release~30345^2~4 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=5e7d7fa57323dfb48fb09464cf4542daa7ce8a72;p=firefly-linux-kernel-4.4.55.git [NET]: Fix UDP checksum issue in net poll mode. In net poll mode, the current checksum function doesn't consider the kind of packet which is padded to reach a specific minimum length. I believe that's the problem causing my test case failed. The following patch fixed this issue. Signed-off-by: Aubrey.Li Signed-off-by: David S. Miller --- diff --git a/net/core/netpoll.c b/net/core/netpoll.c index da1019451ccb..4581ece48bb2 100644 --- a/net/core/netpoll.c +++ b/net/core/netpoll.c @@ -471,6 +471,13 @@ int __netpoll_rx(struct sk_buff *skb) if (skb->len < len || len < iph->ihl*4) goto out; + /* + * Our transport medium may have padded the buffer out. + * Now We trim to the true length of the frame. + */ + if (pskb_trim_rcsum(skb, len)) + goto out; + if (iph->protocol != IPPROTO_UDP) goto out;