linux-kernel - [ 16/36] netxen: fix off by one bug in netxen_release_tx

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Date:	Tue, 12 Feb 2013 12:41:10 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Christoph Paasch <christoph.paasch@...ouvain.be>,
	Eric Dumazet <edumazet@...gle.com>,
	Sony Chacko <sony.chacko@...gic.com>,
	Rajesh Borundia <rajesh.borundia@...gic.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 16/36] netxen: fix off by one bug in netxen_release_tx_buffer()

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------


From: Eric Dumazet <edumazet@...gle.com>

[ Upstream commit a05948f296ce103989b28a2606e47d2e287c3c89 ]

Christoph Paasch found netxen could trigger a BUG in its dismantle
phase, in netxen_release_tx_buffer(), using full size TSO packets.

cmd_buf->frag_count includes the skb->data part, so the loop must
start at index 1 instead of 0, or else we can make an out
of bound access to cmd_buff->frag_array[MAX_SKB_FRAGS + 2]

Christoph provided the fixes in netxen_map_tx_skb() function.
In case of a dma mapping error, its better to clear the dma fields
so that we don't try to unmap them again in netxen_release_tx_buffer()

Reported-by: Christoph Paasch <christoph.paasch@...ouvain.be>
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Tested-by: Christoph Paasch <christoph.paasch@...ouvain.be>
Cc: Sony Chacko <sony.chacko@...gic.com>
Cc: Rajesh Borundia <rajesh.borundia@...gic.com>
Signed-off-by: Christoph Paasch <christoph.paasch@...ouvain.be>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c |    2 +-
 drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c |    2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c
+++ b/drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c
@@ -144,7 +144,7 @@ void netxen_release_tx_buffers(struct ne
 					 buffrag->length, PCI_DMA_TODEVICE);
 			buffrag->dma = 0ULL;
 		}
-		for (j = 0; j < cmd_buf->frag_count; j++) {
+		for (j = 1; j < cmd_buf->frag_count; j++) {
 			buffrag++;
 			if (buffrag->dma) {
 				pci_unmap_page(adapter->pdev, buffrag->dma,
--- a/drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c
+++ b/drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c
@@ -1956,10 +1956,12 @@ unwind:
 	while (--i >= 0) {
 		nf = &pbuf->frag_array[i+1];
 		pci_unmap_page(pdev, nf->dma, nf->length, PCI_DMA_TODEVICE);
+		nf->dma = 0ULL;
 	}
 
 	nf = &pbuf->frag_array[0];
 	pci_unmap_single(pdev, nf->dma, skb_headlen(skb), PCI_DMA_TODEVICE);
+	nf->dma = 0ULL;
 
 out_err:
 	return -ENOMEM;


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