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git://projects.qi-hardware.com/openwrt-xburst.git
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34 lines
1.2 KiB
Diff
34 lines
1.2 KiB
Diff
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From cae49ede00ec3d0cda290b03fee55b72b49efc11 Mon Sep 17 00:00:00 2001
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From: David Woodhouse <dwmw2@infradead.org>
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Date: Tue, 11 Dec 2012 14:57:14 +0000
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Subject: [PATCH] solos-pci: fix double-free of TX skb in DMA mode
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We weren't clearing card->tx_skb[port] when processing the TX done interrupt.
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If there wasn't another skb ready to transmit immediately, this led to a
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double-free because we'd free it *again* next time we did have a packet to
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send.
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Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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Cc: stable@kernel.org
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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drivers/atm/solos-pci.c | 5 +++--
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1 file changed, 3 insertions(+), 2 deletions(-)
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--- a/drivers/atm/solos-pci.c
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+++ b/drivers/atm/solos-pci.c
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@@ -945,10 +945,11 @@ static uint32_t fpga_tx(struct solos_car
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for (port = 0; tx_pending; tx_pending >>= 1, port++) {
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if (tx_pending & 1) {
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struct sk_buff *oldskb = card->tx_skb[port];
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- if (oldskb)
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+ if (oldskb) {
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pci_unmap_single(card->dev, SKB_CB(oldskb)->dma_addr,
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oldskb->len, PCI_DMA_TODEVICE);
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-
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+ card->tx_skb[port] = NULL;
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+ }
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spin_lock(&card->tx_queue_lock);
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skb = skb_dequeue(&card->tx_queue[port]);
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if (!skb)
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