linux-kernel - [ 39/47] solos-pci: fix double-free of TX skb in DMA mode

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Message-Id: <20130109201733.982505528@linuxfoundation.org>
Date:	Wed,  9 Jan 2013 12:35:34 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk,
	David Woodhouse <David.Woodhouse@...el.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 39/47] solos-pci: fix double-free of TX skb in DMA mode

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

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

From: David Woodhouse <dwmw2@...radead.org>

commit cae49ede00ec3d0cda290b03fee55b72b49efc11 upstream.

We weren't clearing card->tx_skb[port] when processing the TX done interrupt.
If there wasn't another skb ready to transmit immediately, this led to a
double-free because we'd free it *again* next time we did have a packet to
send.

Signed-off-by: David Woodhouse <David.Woodhouse@...el.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/atm/solos-pci.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/atm/solos-pci.c
+++ b/drivers/atm/solos-pci.c
@@ -967,10 +967,11 @@ static uint32_t fpga_tx(struct solos_car
 	for (port = 0; tx_pending; tx_pending >>= 1, port++) {
 		if (tx_pending & 1) {
 			struct sk_buff *oldskb = card->tx_skb[port];
-			if (oldskb)
+			if (oldskb) {
 				pci_unmap_single(card->dev, SKB_CB(oldskb)->dma_addr,
 						 oldskb->len, PCI_DMA_TODEVICE);
-
+				card->tx_skb[port] = NULL;
+			}
 			spin_lock(&card->tx_queue_lock);
 			skb = skb_dequeue(&card->tx_queue[port]);
 			if (!skb)


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