pktgen: bug fix in transmission headers with frags=0

(bug introduced by commit 26ad787962ef84677a48c560
(pktgen: speedup fragmented skbs)

The headers of pktgen were incorrectly added in a pktgen packet
without frags (frags=0). There was an offset in the pktgen headers.

The cause was in reusing the pgh variable as a return variable in skb_put
when adding the payload to the skb.

Signed-off-by: Daniel Turull <daniel.turull@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>

1 files changed, 1 insertions, 2 deletions

diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index f0aec6c39ecd..0c55eaa70e39 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -2620,8 +2620,7 @@ static void pktgen_finalize_skb(struct pktgen_dev *pkt_dev, struct sk_buff *skb,
         datalen -= sizeof(*pgh);
 
         if (pkt_dev->nfrags <= 0) {
-                pgh = (struct pktgen_hdr *)skb_put(skb, datalen);
-                memset(pgh + 1, 0, datalen);
+                memset(skb_put(skb, datalen), 0, datalen);
         } else {
                 int frags = pkt_dev->nfrags;
                 int i, len;