net: skb_needs_check() accepts CHECKSUM_NONE for tx

BugLink: http://bugs.launchpad.net/bugs/1710646
commit 6e7bc478c9a006c701c14476ec9d389a484b4864 upstream.

My recent change missed fact that UFO would perform a complete
UDP checksum before segmenting in frags.

In this case skb->ip_summed is set to CHECKSUM_NONE.

We need to add this valid case to skb_needs_check()

Fixes: b2504a5dbef3 ("net: reduce skb_warn_bad_offload() noise")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>

diff --git a/net/core/dev.c b/net/core/dev.c
index 7f458646ab72d759ae99960a4d86464681404828..11211cd3f301033bda49449e88b7294c19105648 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2550,9 +2550,10 @@ EXPORT_SYMBOL(skb_mac_gso_segment);
 static inline bool skb_needs_check(struct sk_buff *skb, bool tx_path)
 {
        if (tx_path)
-               return skb->ip_summed != CHECKSUM_PARTIAL;
-       else
-               return skb->ip_summed == CHECKSUM_NONE;
+               return skb->ip_summed != CHECKSUM_PARTIAL &&
+                      skb->ip_summed != CHECKSUM_NONE;
+
+       return skb->ip_summed == CHECKSUM_NONE;
 }
 
 /**