[PATCH v2 05/20] Input: rmi4 - fix memory leak in rmi_set_attn_data()

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

kfifo_put() returns 0 if the FIFO is full. In this case, we must
free the memory allocated for the attention data to avoid a leak.

Fixes: b908d3cd812a ("Input: synaptics-rmi4 - allow to add attention data")
Cc: stable@vger.kernel.org
Assisted-by: Gemini:gemini-3.1-pro
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---
 drivers/input/rmi4/rmi_driver.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/input/rmi4/rmi_driver.c b/drivers/input/rmi4/rmi_driver.c
index 75949fb1a922..d873c7f08e42 100644
--- a/drivers/input/rmi4/rmi_driver.c
+++ b/drivers/input/rmi4/rmi_driver.c
@@ -183,7 +183,11 @@ void rmi_set_attn_data(struct rmi_device *rmi_dev, unsigned long irq_status,
 	attn_data.size = size;
 	attn_data.data = fifo_data;
 
-	kfifo_put(&drvdata->attn_fifo, attn_data);
+	if (!kfifo_put(&drvdata->attn_fifo, attn_data)) {
+		dev_warn_ratelimited(&rmi_dev->dev,
+				     "Failed to enqueue attention data, FIFO full\n");
+		kfree(fifo_data);
+	}
 }
 EXPORT_SYMBOL_GPL(rmi_set_attn_data);
 
-- 
2.54.0.545.g6539524ca2-goog