[PATCH 2/2] phy: qcom: qmp-pcie: Check clock-output-names count in the multi-PHY driver

[David Carlier <devnexen@gmail.com>]

of_property_count_strings() returns a negative errno when the property
is missing or malformed. The value was passed straight to
devm_kcalloc(), whose overflow check rejected it, turning a device tree
problem into a bogus -ENOMEM with no diagnostic.

Fixes: 1781be3c8a5d ("phy: qcom: qmp-pcie: Add QMP PCIe Multi-PHY driver")
Signed-off-by: David Carlier <devnexen@gmail.com>
---
 drivers/phy/qualcomm/phy-qcom-qmp-pcie-multiphy.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-pcie-multiphy.c b/drivers/phy/qualcomm/phy-qcom-qmp-pcie-multiphy.c
index e93cba4369fb..e747ff9c3e5d 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp-pcie-multiphy.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp-pcie-multiphy.c
@@ -555,6 +555,9 @@ static int qmp_pcie_multiphy_register_clocks(struct device *dev,
 	int i, ret;
 
 	num_pipe_outputs = of_property_count_strings(np, "clock-output-names");
+	if (num_pipe_outputs < 0)
+		return dev_err_probe(dev, num_pipe_outputs,
+				     "failed to read clock-output-names\n");
 
 	qmp_data->num_pipe_outputs = num_pipe_outputs;
 	qmp_data->pipe_out_clks = devm_kcalloc(dev, num_pipe_outputs,
-- 
2.55.0