This is a note to let you know that I've just added the patch titled
staging: rtl8192e: rtl92e_fill_tx_desc fix write to mapped out memory.
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
staging-rtl8192e-rtl92e_fill_tx_desc-fix-write-to-mapped-out-memory.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From baabd567f87be05330faa5140f72a91960e7405a Mon Sep 17 00:00:00 2001
From: Malcolm Priestley <tvboxspy@xxxxxxxxx>
Date: Thu, 11 May 2017 18:57:43 +0100
Subject: staging: rtl8192e: rtl92e_fill_tx_desc fix write to mapped out memory.
From: Malcolm Priestley <tvboxspy@xxxxxxxxx>
commit baabd567f87be05330faa5140f72a91960e7405a upstream.
The driver attempts to alter memory that is mapped to PCI device.
This is because tx_fwinfo_8190pci points to skb->data
Move the pci_map_single to when completed buffer is ready to be mapped with
psdec is empty to drop on mapping error.
Signed-off-by: Malcolm Priestley <tvboxspy@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/rtl8192e/rtl8192e/r8192E_dev.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
--- a/drivers/staging/rtl8192e/rtl8192e/r8192E_dev.c
+++ b/drivers/staging/rtl8192e/rtl8192e/r8192E_dev.c
@@ -1185,8 +1185,7 @@ void rtl92e_fill_tx_desc(struct net_dev
struct cb_desc *cb_desc, struct sk_buff *skb)
{
struct r8192_priv *priv = rtllib_priv(dev);
- dma_addr_t mapping = pci_map_single(priv->pdev, skb->data, skb->len,
- PCI_DMA_TODEVICE);
+ dma_addr_t mapping;
struct tx_fwinfo_8190pci *pTxFwInfo = NULL;
pTxFwInfo = (struct tx_fwinfo_8190pci *)skb->data;
@@ -1197,8 +1196,6 @@ void rtl92e_fill_tx_desc(struct net_dev
pTxFwInfo->Short = _rtl92e_query_is_short(pTxFwInfo->TxHT,
pTxFwInfo->TxRate, cb_desc);
- if (pci_dma_mapping_error(priv->pdev, mapping))
- netdev_err(dev, "%s(): DMA Mapping error\n", __func__);
if (cb_desc->bAMPDUEnable) {
pTxFwInfo->AllowAggregation = 1;
pTxFwInfo->RxMF = cb_desc->ampdu_factor;
@@ -1233,6 +1230,14 @@ void rtl92e_fill_tx_desc(struct net_dev
}
memset((u8 *)pdesc, 0, 12);
+
+ mapping = pci_map_single(priv->pdev, skb->data, skb->len,
+ PCI_DMA_TODEVICE);
+ if (pci_dma_mapping_error(priv->pdev, mapping)) {
+ netdev_err(dev, "%s(): DMA Mapping error\n", __func__);
+ return;
+ }
+
pdesc->LINIP = 0;
pdesc->CmdInit = 1;
pdesc->Offset = sizeof(struct tx_fwinfo_8190pci) + 8;
Patches currently in stable-queue which might be from tvboxspy@xxxxxxxxx are
queue-4.4/staging-rtl8192e-rtl92e_fill_tx_desc-fix-write-to-mapped-out-memory.patch