Patch "mmc: sdhci check parameters before call dma_free_coherent" has been added to the 4.1-stable tree

Patch "mmc: sdhci check parameters before call dma_free_coherent" has been added to the 4.1-stable tree

[gregkh]

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

    mmc: sdhci check parameters before call dma_free_coherent

to the 4.1-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-sdhci-check-parameters-before-call-dma_free_coherent.patch
and it can be found in the queue-4.1 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 7ac020366b0a436d726408841160b5dc32c19214 Mon Sep 17 00:00:00 2001
From: Peng Fan <van.freenix@gmail.com>
Date: Mon, 22 Jun 2015 11:41:23 +0800
Subject: mmc: sdhci check parameters before call dma_free_coherent

From: Peng Fan <van.freenix@gmail.com>

commit 7ac020366b0a436d726408841160b5dc32c19214 upstream.

We should not call dma_free_coherent if host->adma_table is NULL,
otherwise may trigger panic.

Fixes: d1e49f77d7c7 ("mmc: sdhci: convert ADMA descriptors to a...")
Signed-off-by: Peng Fan <van.freenix@gmail.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/mmc/host/sdhci.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -3037,8 +3037,11 @@ int sdhci_add_host(struct sdhci_host *ho
 						      GFP_KERNEL);
 		host->align_buffer = kmalloc(host->align_buffer_sz, GFP_KERNEL);
 		if (!host->adma_table || !host->align_buffer) {
-			dma_free_coherent(mmc_dev(mmc), host->adma_table_sz,
-					  host->adma_table, host->adma_addr);
+			if (host->adma_table)
+				dma_free_coherent(mmc_dev(mmc),
+						  host->adma_table_sz,
+						  host->adma_table,
+						  host->adma_addr);
 			kfree(host->align_buffer);
 			pr_warn("%s: Unable to allocate ADMA buffers - falling back to standard DMA\n",
 				mmc_hostname(mmc));


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

queue-4.1/mmc-sdhci-check-parameters-before-call-dma_free_coherent.patch