[PATCH] fix: i2c: i2c_mux_add_adapter: fix child device_node reference leak on adapter registration failure

[WenTao Liang]

When the OF block successfully acquires a child device_node reference and
  stores it in priv->adap.dev.of_node, but the subsequent
  i2c_add_numbered_adapter or i2c_add_adapter call fails, the error path
  jumps to err_free_priv which only kfree's the priv without calling
  of_node_put on the stored child node, leaking the reference.

Add of_node_put(priv->adap.dev.of_node) in the err_free_priv error path.

Cc: stable@xxxxxxxxxxxxxxx
Fixes: a7ab72390b77 ("i2c: mux: add common data for every i2c-mux instance")
Signed-off-by: WenTao Liang <vulab@xxxxxxxxxxx>
---
 drivers/i2c/i2c-mux.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/i2c/i2c-mux.c b/drivers/i2c/i2c-mux.c
index 681a201c239b..68a4c34b5987 100644
--- a/drivers/i2c/i2c-mux.c
+++ b/drivers/i2c/i2c-mux.c
@@ -408,6 +408,7 @@ int i2c_mux_add_adapter(struct i2c_mux_core *muxc,
 	return 0;
 
 err_free_priv:
+	of_node_put(priv->adap.dev.of_node);
 	kfree(priv);
 	return ret;
 }
-- 
2.39.5 (Apple Git-154)