staging: rtl8192e: rtl92e_fill_tx_desc fix write to mapped out memory.

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@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/rtl8192e/rtl8192e/r8192E_dev.c b/drivers/staging/rtl8192e/rtl8192e/r8192E_dev.c
index 4723a0bd5067595fdbc38850887cdc69a947c59e..a23628f390c9f18d39ec3f3d2823a994c0db1656 100644 (file)
--- a/drivers/staging/rtl8192e/rtl8192e/r8192E_dev.c
+++ b/drivers/staging/rtl8192e/rtl8192e/r8192E_dev.c
@@ -1182,8 +1182,7 @@ void  rtl92e_fill_tx_desc(struct net_device *dev, struct tx_desc *pdesc,
                          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;
 
        pTxFwInfo = (struct tx_fwinfo_8190pci *)skb->data;
@@ -1194,8 +1193,6 @@ void  rtl92e_fill_tx_desc(struct net_device *dev, struct tx_desc *pdesc,
        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;
@@ -1230,6 +1227,14 @@ void  rtl92e_fill_tx_desc(struct net_device *dev, struct tx_desc *pdesc,
        }
 
        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;