From: Dhananjay Phadke <dhananjay@netxen.com>
Date: Thu, 3 Sep 2009 13:10:55 +0000 (+0000)
Subject: netxen: fix infinite loop on dma mapping failure
X-Git-Tag: firefly_0821_release~12983^2~105
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=cf503e8f458cec455b18d3938b3b27de6db3105e;p=firefly-linux-kernel-4.4.55.git

netxen: fix infinite loop on dma mapping failure

Fix a perpetual while() loop in unwinding partial
mapped tx skb on dma mapping failure.

Reported-by: "Juha Leppanen" <juha_motorsportcom@luukku.com>
Signed-off-by: Dhananjay Phadke <dhananjay@netxen.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/netxen/netxen_nic_main.c b/drivers/net/netxen/netxen_nic_main.c
index 53d57dc4d644..41b29671fc9a 100644
--- a/drivers/net/netxen/netxen_nic_main.c
+++ b/drivers/net/netxen/netxen_nic_main.c
@@ -1577,8 +1577,8 @@ netxen_map_tx_skb(struct pci_dev *pdev,
 	return 0;
 
 unwind:
-	while (i > 0) {
-		nf = &pbuf->frag_array[i];
+	while (--i >= 0) {
+		nf = &pbuf->frag_array[i+1];
 		pci_unmap_page(pdev, nf->dma, nf->length, PCI_DMA_TODEVICE);
 	}