This is a note to let you know that I've just added the patch titled
DMA: OF: Check properties value before running be32_to_cpup() on it
to the 3.9-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:
dma-of-check-properties-value-before-running-be32_to_cpup-on-it.patch
and it can be found in the queue-3.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From 9a188eb126aa7bf27077ee46fcb914898d6fc281 Mon Sep 17 00:00:00 2001
From: Viresh Kumar <[email protected]>
Date: Fri, 15 Mar 2013 14:18:20 +0530
Subject: DMA: OF: Check properties value before running be32_to_cpup() on it
From: Viresh Kumar <[email protected]>
commit 9a188eb126aa7bf27077ee46fcb914898d6fc281 upstream.
In of_dma_controller_register() routine we are calling of_get_property() as an
parameter to be32_to_cpup(). In case the property doesn't exist we will get a
crash.
This patch changes this code to check if we got a valid property first and then
runs be32_to_cpup() on it.
Signed-off-by: Viresh Kumar <[email protected]>
Signed-off-by: Vinod Koul <[email protected]>
Signed-off-by: Robert Richter <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/dma/of-dma.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
--- a/drivers/dma/of-dma.c
+++ b/drivers/dma/of-dma.c
@@ -93,6 +93,7 @@ int of_dma_controller_register(struct de
{
struct of_dma *ofdma;
int nbcells;
+ const __be32 *prop;
if (!np || !of_dma_xlate) {
pr_err("%s: not enough information provided\n", __func__);
@@ -103,8 +104,11 @@ int of_dma_controller_register(struct de
if (!ofdma)
return -ENOMEM;
- nbcells = be32_to_cpup(of_get_property(np, "#dma-cells", NULL));
- if (!nbcells) {
+ prop = of_get_property(np, "#dma-cells", NULL);
+ if (prop)
+ nbcells = be32_to_cpup(prop);
+
+ if (!prop || !nbcells) {
pr_err("%s: #dma-cells property is missing or invalid\n",
__func__);
kfree(ofdma);
Patches currently in stable-queue which might be from [email protected]
are
queue-3.9/dma-of-check-properties-value-before-running-be32_to_cpup-on-it.patch
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