linux-kernel - [PATCH 2/2] serial: sprd: Fix DMA buffer leak issue

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Date:   Mon, 10 Jul 2023 16:03:48 +0800
From:   Chunyan Zhang <chunyan.zhang@...soc.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>
CC:     <linux-serial@...r.kernel.org>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Orson Zhai <orsonzhai@...il.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        Chunyan Zhang <chunyan.zhang@...soc.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/2] serial: sprd: Fix DMA buffer leak issue

Release DMA buffer when _probe() returns fail to avoid memory leak.

Fixes: f4487db58eb7 ("serial: sprd: Add DMA mode support")
Signed-off-by: Chunyan Zhang <chunyan.zhang@...soc.com>
---
 drivers/tty/serial/sprd_serial.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/sprd_serial.c b/drivers/tty/serial/sprd_serial.c
index 942808517393..e1f11382fc39 100644
--- a/drivers/tty/serial/sprd_serial.c
+++ b/drivers/tty/serial/sprd_serial.c
@@ -1203,7 +1203,7 @@ static int sprd_probe(struct platform_device *pdev)
 		ret = uart_register_driver(&sprd_uart_driver);
 		if (ret < 0) {
 			pr_err("Failed to register SPRD-UART driver\n");
-			return ret;
+			goto free_rx_buf;
 		}
 	}
 	sprd_ports_num++;
@@ -1222,6 +1222,8 @@ static int sprd_probe(struct platform_device *pdev)
 	sprd_port[index] = NULL;
 	sprd_ports_num--;
 	uart_unregister_driver(&sprd_uart_driver);
+free_rx_buf:
+	sprd_rx_free_buf(sport);
 	return ret;
 }
 
-- 
2.41.0