From: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
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.
Additional notes on this stable commit:
Fixing NULL pointer access on Calxeda Highbank systems that don't have
a '#dma-cells' property. Fix is for 3.9 stable only.
Signed-off-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
Signed-off-by: Vinod Koul <vinod.koul@xxxxxxxxx>
Signed-off-by: Robert Richter <robert.richter@xxxxxxxxxxx>
---
drivers/dma/of-dma.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/dma/of-dma.c b/drivers/dma/of-dma.c
index 69d04d2..09c7ad1 100644
--- a/drivers/dma/of-dma.c
+++ b/drivers/dma/of-dma.c
@@ -93,6 +93,7 @@ int of_dma_controller_register(struct device_node *np,
{
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 device_node *np,
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);
--
1.8.1.1
--
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