[PATCH 7.1 11/21] Input: rmi4 - fix memory leak in rmi_set_attn_data()

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

7.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dmitry Torokhov <dmitry.torokhov@gmail.com>

commit a55a683a8e2bddb5467baab3e597a93022d4ee05 upstream.

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
Link: https://patch.msgid.link/20260505045952.1570713-5-dmitry.torokhov@gmail.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/input/rmi4/rmi_driver.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- 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
 	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);