[3.11.y.z extended stable] Patch "mwifiex: add NULL check for PCIe Rx skb" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    mwifiex: add NULL check for PCIe Rx skb

to the linux-3.11.y-queue branch of the 3.11.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-3.11.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 3.11.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From 1d45a35583a5e982370712e278a630d7e597e891 Mon Sep 17 00:00:00 2001
From: Amitkumar Karwar <akarwar at marvell.com>
Date: Tue, 18 Feb 2014 15:41:55 -0800
Subject: mwifiex: add NULL check for PCIe Rx skb

commit bb8e6a1ee881d131e404f0f1f5e8dc9281002771 upstream.

We may get a NULL pointer here if skb allocation for Rx packet
was failed earlier.

Signed-off-by: Amitkumar Karwar <akarwar at marvell.com>
Signed-off-by: Bing Zhao <bzhao at marvell.com>
Signed-off-by: John W. Linville <linville at tuxdriver.com>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/net/wireless/mwifiex/pcie.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/wireless/mwifiex/pcie.c b/drivers/net/wireless/mwifiex/pcie.c
index 20c9c4c..1662b99 100644
--- a/drivers/net/wireless/mwifiex/pcie.c
+++ b/drivers/net/wireless/mwifiex/pcie.c
@@ -1195,6 +1195,12 @@ static int mwifiex_pcie_process_recv_data(struct mwifiex_adapter *adapter)
 		rd_index = card->rxbd_rdptr & reg->rx_mask;
 		skb_data = card->rx_buf_list[rd_index];

+		/* If skb allocation was failed earlier for Rx packet,
+		 * rx_buf_list[rd_index] would have been left with a NULL.
+		 */
+		if (!skb_data)
+			return -ENOMEM;
+
 		MWIFIEX_SKB_PACB(skb_data, &buf_pa);
 		pci_unmap_single(card->dev, buf_pa, MWIFIEX_RX_DATA_BUF_SIZE,
 				 PCI_DMA_FROMDEVICE);
--
1.9.0