[POWERPC] Sky Cpu and Nexus: check for platform_get_resource retcode

Add adds checking for platform_get_resource() return code to prevent
possible NULL pointer usage.

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Kumar Gala <galak@gate.crashing.org>
Cc: Brian Waite <waite@skycomputers.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/misc/hdpuftrs/hdpu_cpustate.c b/drivers/misc/hdpuftrs/hdpu_cpustate.c
index b5c6f21dcb69..b16742c7c69d 100644
--- a/drivers/misc/hdpuftrs/hdpu_cpustate.c
+++ b/drivers/misc/hdpuftrs/hdpu_cpustate.c
@@ -194,6 +194,11 @@ static int hdpu_cpustate_probe(struct platform_device *pdev)
         int ret;
 
         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!res) {
+                printk(KERN_ERR "sky_cpustate: "
+                       "Invalid memory resource.\n");
+                return -EINVAL;
+        }
         cpustate.set_addr = (unsigned long *)res->start;
         cpustate.clr_addr = (unsigned long *)res->end - 1;