diff options
| author | Viresh Kumar <viresh.kumar@linaro.org> | 2013-03-15 12:48:20 +0400 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2013-04-15 08:22:03 +0400 |
| commit | 9a188eb126aa7bf27077ee46fcb914898d6fc281 (patch) | |
| tree | 49a72638e45f8a23c0f5d106c4f720c187297b3f /drivers/dma | |
| parent | bef29ec508e58bf8b9ec0915de5b0739fb800c91 (diff) | |
| download | linux-9a188eb126aa7bf27077ee46fcb914898d6fc281.tar.xz | |
DMA: OF: Check properties value before running be32_to_cpup() on it
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 <viresh.kumar@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/of-dma.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/dma/of-dma.c b/drivers/dma/of-dma.c index 6036cd08e222..00db454f70d3 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); |