netdev - [patch v2] qlge: pull NULL check ahead of dereference

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Date:	Thu, 19 Aug 2010 20:52:44 +0200
From:	Dan Carpenter <error27@...il.com>
To:	Linux Driver <Linux-Driver@...gic.com>,
	"David S. Miller" <davem@...emloft.net>,
	Breno Leitao <leitao@...ux.vnet.ibm.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
	ron.mercer@...gic.com
Subject: [patch v2] qlge: pull NULL check ahead of dereference

There was a dereference before NULL check issue introduced in 1e213303d
"qlge: Add tx multiqueue support."  I've pulled the NULL check of
"net_rsp" forward a couple lines to avoid that.

Also Ron Mercer says that the early exit should be above the index
write.  ql_write_cq_idx(rx_ring);

Signed-off-by: Dan Carpenter <error27@...il.com>
---
v2: Moved the early exit ahead of the ql_write_cq_idx()

diff --git a/drivers/net/qlge/qlge_main.c b/drivers/net/qlge/qlge_main.c
index 8d63f69..c9f9754 100644
--- a/drivers/net/qlge/qlge_main.c
+++ b/drivers/net/qlge/qlge_main.c
@@ -2222,10 +2222,11 @@ static int ql_clean_outbound_rx_ring(struct rx_ring *rx_ring)
 		ql_update_cq(rx_ring);
 		prod = ql_read_sh_reg(rx_ring->prod_idx_sh_reg);
 	}
+	if (!net_rsp)
+		return 0;
 	ql_write_cq_idx(rx_ring);
 	tx_ring = &qdev->tx_ring[net_rsp->txq_idx];
-	if (__netif_subqueue_stopped(qdev->ndev, tx_ring->wq_id) &&
-					net_rsp != NULL) {
+	if (__netif_subqueue_stopped(qdev->ndev, tx_ring->wq_id)) {
 		if (atomic_read(&tx_ring->queue_stopped) &&
 		    (atomic_read(&tx_ring->tx_count) > (tx_ring->wq_len / 4)))
 			/*
--
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