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 4.11-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-4.11 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 @@ -1184,8 +1184,7 @@ 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; pTxFwInfo = (struct tx_fwinfo_8190pci *)skb->data; @@ -1196,8 +1195,6 @@ 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; @@ -1232,6 +1229,14 @@ 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-4.11/staging-rtl8192e-rtl92e_get_eeprom_size-fix-read-size-of-eprom_cmd.patch queue-4.11/staging-rtl8192e-getts-fix-invalid-tid-7-warning.patch queue-4.11/staging-rtl8192e-rtl92e_fill_tx_desc-fix-write-to-mapped-out-memory.patch queue-4.11/staging-rtl8192e-fix-2-byte-alignment-of-register-bssidr.patch