There is a potential execution path in which function
platform_get_resource() returns NULL. If this happens,
we will end up having a NULL pointer dereference.
Fix this by adding a sanity check in order to avoid a
NULL pointer dereference.
This code was detected with the help of Coccinelle.
Cc: sta...@vger.kernel.org
Fixes: f700e84f417b ("mailbox: Add support for APM X-Gene platform mailbox
driver")
Signed-off-by: Gustavo A. R. Silva <gust...@embeddedor.com>
---
drivers/mailbox/mailbox-xgene-slimpro.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/mailbox/mailbox-xgene-slimpro.c
b/drivers/mailbox/mailbox-xgene-slimpro.c
index a704016..d2c02b7 100644
--- a/drivers/mailbox/mailbox-xgene-slimpro.c
+++ b/drivers/mailbox/mailbox-xgene-slimpro.c
@@ -195,6 +195,9 @@ static int slimpro_mbox_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, ctx);
regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!regs)
+ return -EINVAL;
+
mb_base = devm_ioremap(&pdev->dev, regs->start, resource_size(regs));
if (!mb_base)
return -ENOMEM;
--
2.7.4
