[PATCH] clk: si5341: Fix NULL pointer dereference in probe

[Yang Zi <2959243019@qq.com>]

si5341_probe() dereferences client->dev.of_node->name without first
checking that a device tree node is present. When the device is
instantiated without DT, e.g. via sysfs "new_device", client->dev.of_node
is NULL and probe crashes with a NULL pointer dereference.

Add an early check and return -ENODEV when no of_node is available, since
this driver requires device tree bindings.

Signed-off-by: Yang Zi <2959243019@qq.com>
---
 drivers/clk/clk-si5341.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/clk/clk-si5341.c b/drivers/clk/clk-si5341.c
index 2499b771cd83..9d901c2fd0df 100644
--- a/drivers/clk/clk-si5341.c
+++ b/drivers/clk/clk-si5341.c
@@ -1567,6 +1567,9 @@ static int si5341_probe(struct i2c_client *client)
     bool initialization_required;
     u32 status;
 
+    if (!client->dev.of_node)
+        return -ENODEV;
+
     data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
     if (!data)
         return -ENOMEM;