linux-kernel - [PATCH v2] input: raspberrypi-ts: Fix refcount leak in rpi_ts

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Message-Id: <20221223074657.810346-1-linmq006@gmail.com>
Date:   Fri, 23 Dec 2022 11:46:53 +0400
From:   Miaoqian Lin <linmq006@...il.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Miaoqian Lin <linmq006@...il.com>,
        Rob Herring <robh@...nel.org>, Eric Anholt <eric@...olt.net>,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        linux-input@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] input: raspberrypi-ts: Fix refcount leak in rpi_ts_probe

rpi_firmware_get() take reference, we need to release it in error paths
as well. Use devm_rpi_firmware_get() helper to handling the resources.
Also remove the existing rpi_firmware_put().

Fixes: 0b9f28fed3f7 ("Input: add official Raspberry Pi's touchscreen driver")
Fixes: 3b8ddff780b7 ("input: raspberrypi-ts: Release firmware handle when not needed")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
changes in v2:
- use devm_rpi_firmware_get().
- remove rpi_firmware_put().
---
 drivers/input/touchscreen/raspberrypi-ts.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/input/touchscreen/raspberrypi-ts.c b/drivers/input/touchscreen/raspberrypi-ts.c
index 5000f5fd9ec3..45c575df994e 100644
--- a/drivers/input/touchscreen/raspberrypi-ts.c
+++ b/drivers/input/touchscreen/raspberrypi-ts.c
@@ -134,7 +134,7 @@ static int rpi_ts_probe(struct platform_device *pdev)
 		return -ENOENT;
 	}
 
-	fw = rpi_firmware_get(fw_node);
+	fw = devm_rpi_firmware_get(&pdev->dev, fw_node);
 	of_node_put(fw_node);
 	if (!fw)
 		return -EPROBE_DEFER;
@@ -160,7 +160,6 @@ static int rpi_ts_probe(struct platform_device *pdev)
 	touchbuf = (u32)ts->fw_regs_phys;
 	error = rpi_firmware_property(fw, RPI_FIRMWARE_FRAMEBUFFER_SET_TOUCHBUF,
 				      &touchbuf, sizeof(touchbuf));
-	rpi_firmware_put(fw);
 	if (error || touchbuf != 0) {
 		dev_warn(dev, "Failed to set touchbuf, %d\n", error);
 		return error;
-- 
2.25.1