Re: [Patch] serial: 8250_bcm7271: fix leak in `brcmuart_probe`

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On 4/24/2023 5:51 AM, XuDong Liu wrote:
Smatch reports:
drivers/tty/serial/8250/8250_bcm7271.c:1120 brcmuart_probe() warn:
'baud_mux_clk' from clk_prepare_enable() not released on lines: 1032.

In the function brcmuart_probe(), baud_mux_clk was not correctly released
in subsequent error handling, which may cause memory leaks.

To fix this issue, an error handling branch, err_clk_put, is added to
release the variable using clk_put(), and an err_disable branch is added
to meet the requirement of balancing clk_disable and clk_enable calls.

Fixes: 15ac1122fd6d ("serial: 8250_bcm7271: Fix arbitration handling")
Signed-off-by: XuDong Liu <m202071377@xxxxxxxxxxx>
Reviewed-by: Dongliang Mu <dzm91@xxxxxxxxxxx>
---
The issue is discovered by static analysis, and the patch is not tested
yet.
---
  drivers/tty/serial/8250/8250_bcm7271.c | 8 ++++++--
  1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_bcm7271.c b/drivers/tty/serial/8250/8250_bcm7271.c
index f801b1f5b46c..b1670558868b 100644
--- a/drivers/tty/serial/8250/8250_bcm7271.c
+++ b/drivers/tty/serial/8250/8250_bcm7271.c
@@ -1023,7 +1023,7 @@ static int brcmuart_probe(struct platform_device *pdev)
  		dev_dbg(dev, "BAUD MUX clock found\n");
  		ret = clk_prepare_enable(baud_mux_clk);
  		if (ret)
-			goto release_dma;
+			goto err_clk_put;
  		priv->baud_mux_clk = baud_mux_clk;
  		init_real_clk_rates(dev, priv);
  		clk_rate = priv->default_mux_rate;
@@ -1032,7 +1032,7 @@ static int brcmuart_probe(struct platform_device *pdev)
  	if (clk_rate == 0) {
  		dev_err(dev, "clock-frequency or clk not defined\n");
  		ret = -EINVAL;
-		goto release_dma;
+		goto err_clk_disable;
  	}
dev_dbg(dev, "DMA is %senabled\n", priv->dma_enabled ? "" : "not ");
@@ -1119,6 +1119,10 @@ static int brcmuart_probe(struct platform_device *pdev)
  	serial8250_unregister_port(priv->line);
  err:
  	brcmuart_free_bufs(dev, priv);
+err_clk_disable:
+	clk_disable_unprepare(baud_mux_clk);
+err_clk_put:
+	clk_put(baud_mux_clk);
  release_dma:
  	if (priv->dma_enabled)
  		brcmuart_arbitration(priv, 0);
Thank you for bringing this to my attention.

-Doug



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