linux-kernel - [PATCH 4.17 34/42] misc: sram: fix resource leaks in probe error path

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Message-Id: <20180821055019.280466985@linuxfoundation.org>
Date:   Tue, 21 Aug 2018 08:21:06 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
        Johan Hovold <johan@...nel.org>
Subject: [PATCH 4.17 34/42] misc: sram: fix resource leaks in probe error path

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

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

From: Johan Hovold <johan@...nel.org>

commit f294d00961d1d869ecffa60e280eeeee1ccf9a49 upstream.

Make sure to disable clocks and deregister any exported partitions
before returning on late probe errors.

Note that since commit ee895ccdf776 ("misc: sram: fix enabled clock leak
on error path"), partitions are deliberately exported before enabling
the clock so we stick to that logic here. A follow up patch will address
this.

Cc: stable <stable@...r.kernel.org>     # 4.9
Cc: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/misc/sram.c |    9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

--- a/drivers/misc/sram.c
+++ b/drivers/misc/sram.c
@@ -407,13 +407,20 @@ static int sram_probe(struct platform_de
 	if (init_func) {
 		ret = init_func();
 		if (ret)
-			return ret;
+			goto err_disable_clk;
 	}
 
 	dev_dbg(sram->dev, "SRAM pool: %zu KiB @ 0x%p\n",
 		gen_pool_size(sram->pool) / 1024, sram->virt_base);
 
 	return 0;
+
+err_disable_clk:
+	if (sram->clk)
+		clk_disable_unprepare(sram->clk);
+	sram_free_partitions(sram);
+
+	return ret;
 }
 
 static int sram_remove(struct platform_device *pdev)