Patchwork [3.5.y.z,extended,stable] Patch "solos-pci: fix double-free of TX skb in DMA mode" has been added to staging queue

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Submitter Herton Ronaldo Krzesinski
Date Jan. 7, 2013, 8:38 p.m.
Message ID <1357591109-22182-1-git-send-email-herton.krzesinski@canonical.com>
Download mbox | patch
Permalink /patch/210216/
State New
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Comments

Herton Ronaldo Krzesinski - Jan. 7, 2013, 8:38 p.m.
This is a note to let you know that I have just added a patch titled

    solos-pci: fix double-free of TX skb in DMA mode

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Herton

------

From 2c1e3d47c60a2bb052c9988bc1896b7a1bdc4866 Mon Sep 17 00:00:00 2001
From: David Woodhouse <dwmw2@infradead.org>
Date: Tue, 11 Dec 2012 14:57:14 +0000
Subject: [PATCH] solos-pci: fix double-free of TX skb in DMA mode

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@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
---
 drivers/atm/solos-pci.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--
1.7.9.5

Patch

diff --git a/drivers/atm/solos-pci.c b/drivers/atm/solos-pci.c
index 9851093..1853a45 100644
--- a/drivers/atm/solos-pci.c
+++ b/drivers/atm/solos-pci.c
@@ -967,10 +967,11 @@  static uint32_t fpga_tx(struct solos_card *card)
 	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)