[PATCH] mfd: core: Fix possible ZERO_SIZE_PTR pointer dereferencing error.

[Xiubo Li]

Since we cannot make sure the 'cell->num_resources' will always be none
zero here, and then if either equal to zero, the kzalloc() will return
ZERO_SIZE_PTR, which equals to ((void *)16).

So this patch fix this with just doing the zero check before calling
kzalloc().

Signed-off-by: Xiubo Li <Li.Xiubo@xxxxxxxxxxxxx>
---
 drivers/mfd/mfd-core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c
index 892d343..54c7e35 100644
--- a/drivers/mfd/mfd-core.c
+++ b/drivers/mfd/mfd-core.c
@@ -89,6 +89,9 @@ static int mfd_add_device(struct device *parent, int id,
 	int ret = -ENOMEM;
 	int r;
 
+	if (!cell->num_resources)
+		return -EINVAL;
+
 	pdev = platform_device_alloc(cell->name, id + cell->id);
 	if (!pdev)
 		goto fail_alloc;
-- 
2.1.0.27.g96db324

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