From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932077Ab2L1TSU (ORCPT ); Fri, 28 Dec 2012 14:18:20 -0500 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:55200 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754677Ab2L1TSI (ORCPT ); Fri, 28 Dec 2012 14:18:08 -0500 Message-Id: <20121228190356.401020217@decadent.org.uk> User-Agent: quilt/0.60-1 Date: Fri, 28 Dec 2012 20:05:35 +0100 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, David Woodhouse , David Woodhouse , "David S. Miller" Subject: [ 125/173] solos-pci: fix double-free of TX skb in DMA mode In-Reply-To: <20121228190330.025298996@decadent.org.uk> X-SA-Exim-Connect-IP: 151.217.219.220 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.2-stable review patch. If anyone has any objections, please let me know. ------------------ From: David Woodhouse 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 Signed-off-by: David S. Miller Signed-off-by: Ben Hutchings --- drivers/atm/solos-pci.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/atm/solos-pci.c b/drivers/atm/solos-pci.c index 6619a8a..c909b7b 100644 --- a/drivers/atm/solos-pci.c +++ b/drivers/atm/solos-pci.c @@ -945,10 +945,11 @@ 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)