linux-kernel - [PATCH] staging: wlags49_h2: Fix use of skb after netif

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Message-ID: <20140621150408.GA3340@himangi-Dell>
Date:	Sat, 21 Jun 2014 20:34:09 +0530
From:	Himangi Saraogi <himangi774@...il.com>
To:	Henk de Groot <pe1dnn@...at.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Cc:	julia.lawall@...6.fr
Subject: [PATCH] staging: wlags49_h2: Fix use of skb after netif_rx

This patch moves a call to netif_rx(skb) after a subsequent reference to
skb, because netif_rx may call kfree_skb via enqueue_to_backlog on its
argument.

This was found using the following semantic match.

// <smpl>
@@
expression skb, e,e1;
@@

(
 netif_rx(skb);
|
 netif_rx_ni(skb);
)
  ... when != skb = e
(
  skb = e1
|
* skb
)
// </smpl>

Signed-off-by: Himangi Saraogi <himangi774@...il.com>
Acked-by: Julia Lawall <julia.lawall@...6.fr>
---
 drivers/staging/wlags49_h2/wl_netdev.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/staging/wlags49_h2/wl_netdev.c b/drivers/staging/wlags49_h2/wl_netdev.c
index a10d014..60701d43 100644
--- a/drivers/staging/wlags49_h2/wl_netdev.c
+++ b/drivers/staging/wlags49_h2/wl_netdev.c
@@ -888,8 +888,6 @@ int wl_rx(struct net_device *dev)
 				GET_PACKET(skb->dev, skb, pktlen);
 
 				if (status == HCF_SUCCESS) {
-					netif_rx(skb);
-
 					if (port == 0) {
 						lp->stats.rx_packets++;
 						lp->stats.rx_bytes += pktlen;
@@ -918,6 +916,7 @@ int wl_rx(struct net_device *dev)
 					}
 #endif /* WIRELESS_SPY */
 #endif /* WIRELESS_EXT */
+					netif_rx(skb);
 				} else {
 					DBG_ERROR(DbgInfo,
 						  "Rx request to card FAILED\n");
-- 
1.9.1

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