omap: mailbox: check iomem resource before dereferencing it

Add a NULL check for iomem resource in mailbox probe functions.

Signed-off-by: Fernando Guzman Lugo <lugo.fernando@gmail.com>
Signed-off-by: Suman Anna <s-anna@ti.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/mailbox.c b/arch/arm/mach-omap2/mailbox.c
index 0b080267b7f6..9fe0bf2fef33 100644
--- a/arch/arm/mach-omap2/mailbox.c
+++ b/arch/arm/mach-omap2/mailbox.c
@@ -382,6 +382,9 @@ static int omap2_mbox_probe(struct platform_device *pdev)
         }
 
         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!mem)
+                return -ENOENT;
+
         mbox_base = ioremap(mem->start, resource_size(mem));
         if (!mbox_base)
                 return -ENOMEM;