Patch "net: qcom/emac: specify the correct size when mapping a DMA buffer" has been added to the 4.13-stable tree

Patch "net: qcom/emac: specify the correct size when mapping a DMA buffer" has been added to the 4.13-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    net: qcom/emac: specify the correct size when mapping a DMA buffer

to the 4.13-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:
     net-qcom-emac-specify-the-correct-size-when-mapping-a-dma-buffer.patch
and it can be found in the queue-4.13 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Mon Oct  9 09:32:35 CEST 2017
From: Timur Tabi <timur@codeaurora.org>
Date: Fri, 22 Sep 2017 15:32:44 -0500
Subject: net: qcom/emac: specify the correct size when mapping a DMA buffer

From: Timur Tabi <timur@codeaurora.org>


[ Upstream commit a93ad944f4ff9a797abff17c73fc4b1e4a1d9141 ]

When mapping the RX DMA buffers, the driver was accidentally specifying
zero for the buffer length.  Under normal circumstances, SWIOTLB does not
need to allocate a bounce buffer, so the address is just mapped without
checking the size field.  This is why the error was not detected earlier.

Fixes: b9b17debc69d ("net: emac: emac gigabit ethernet controller driver")
Cc: stable@vger.kernel.org
Signed-off-by: Timur Tabi <timur@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/net/ethernet/qualcomm/emac/emac-mac.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/qualcomm/emac/emac-mac.c
+++ b/drivers/net/ethernet/qualcomm/emac/emac-mac.c
@@ -876,7 +876,8 @@ static void emac_mac_rx_descs_refill(str
 
 		curr_rxbuf->dma_addr =
 			dma_map_single(adpt->netdev->dev.parent, skb->data,
-				       curr_rxbuf->length, DMA_FROM_DEVICE);
+				       adpt->rxbuf_size, DMA_FROM_DEVICE);
+
 		ret = dma_mapping_error(adpt->netdev->dev.parent,
 					curr_rxbuf->dma_addr);
 		if (ret) {


Patches currently in stable-queue which might be from timur@codeaurora.org are

queue-4.13/net-qcom-emac-specify-the-correct-size-when-mapping-a-dma-buffer.patch