Patch "mmc: atmel-mci: Check pdata for NULL before dereferencing it at DMA config" has been added to the 4.5-stable tree

Patch "mmc: atmel-mci: Check pdata for NULL before dereferencing it at DMA config" has been added to the 4.5-stable tree

[gregkh]

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

    mmc: atmel-mci: Check pdata for NULL before dereferencing it at DMA config

to the 4.5-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:
     mmc-atmel-mci-check-pdata-for-null-before-dereferencing-it-at-dma-config.patch
and it can be found in the queue-4.5 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 93c77d2999b09f2084b033ea6489915e0104ad9c Mon Sep 17 00:00:00 2001
From: Brent Taylor <motobud@gmail.com>
Date: Sun, 13 Mar 2016 00:25:31 -0600
Subject: mmc: atmel-mci: Check pdata for NULL before dereferencing it at DMA config

From: Brent Taylor <motobud@gmail.com>

commit 93c77d2999b09f2084b033ea6489915e0104ad9c upstream.

Using an at91sam9g20ek development board with DTS configuration may trigger
a kernel panic because of a NULL pointer dereference exception, while
configuring DMA. Let's fix this by adding a check for pdata before
dereferencing it.

Signed-off-by: Brent Taylor <motobud@gmail.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/mmc/host/atmel-mci.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/mmc/host/atmel-mci.c
+++ b/drivers/mmc/host/atmel-mci.c
@@ -2443,7 +2443,7 @@ static int atmci_configure_dma(struct at
 		struct mci_platform_data *pdata = host->pdev->dev.platform_data;
 		dma_cap_mask_t mask;
 
-		if (!pdata->dma_filter)
+		if (!pdata || !pdata->dma_filter)
 			return -ENODEV;
 
 		dma_cap_zero(mask);


Patches currently in stable-queue which might be from motobud@gmail.com are

queue-4.5/mmc-atmel-mci-check-pdata-for-null-before-dereferencing-it-at-dma-config.patch