linux-kernel - [PATCH net 1/1] hv_netvsc: Fix a bug in netvsc_start

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Date:	Mon, 27 Apr 2015 18:14:50 -0700
From:	"K. Y. Srinivasan" <kys@...rosoft.com>
To:	davem@...emloft.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
	olaf@...fle.de, apw@...onical.com, jasowang@...hat.com
Cc:	"K. Y. Srinivasan" <kys@...rosoft.com>
Subject: [PATCH net 1/1] hv_netvsc: Fix a bug in netvsc_start_xmit()

Commit commit b08cc79155fc26d0d112b1470d1ece5034651a4b eliminated memory
allocation in the packet send path. This commit introduced a bug since it
did not account for the case if the skb was cloned. Fix this bug by
using the pre-reserved head room only if the skb is not cloned.

Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
---
 drivers/net/hyperv/netvsc_drv.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index a3a9d38..7eb0251 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -421,7 +421,7 @@ check_size:
 
 	pkt_sz = sizeof(struct hv_netvsc_packet) + RNDIS_AND_PPI_SIZE;
 
-	if (head_room < pkt_sz) {
+	if (skb->cloned ||  head_room < pkt_sz) {
 		packet = kmalloc(pkt_sz, GFP_ATOMIC);
 		if (!packet) {
 			/* out of memory, drop packet */
-- 
1.7.4.1

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