linux-kernel - [PATCH 5.10 644/717] spi: spi-mtk-nor: Dont leak SPI master in probe error path

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Date:   Mon, 28 Dec 2020 13:50:42 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Lukas Wunner <lukas@...ner.de>,
        Ikjoon Jang <ikjn@...omium.org>,
        Chuanhong Guo <gch981213@...il.com>,
        Mark Brown <broonie@...nel.org>
Subject: [PATCH 5.10 644/717] spi: spi-mtk-nor: Dont leak SPI master in probe error path

From: Lukas Wunner <lukas@...ner.de>

commit 0f4ad8d59f33b24dd86739f3be23e6af1a86f5a9 upstream.

If the call to devm_spi_register_controller() fails on probe of the
MediaTek SPI NOR driver, the spi_controller struct is erroneously not
freed.

Since commit a1daaa991ed1 ("spi: spi-mtk-nor: use dma_alloc_coherent()
for bounce buffer"), the same happens if the call to
dmam_alloc_coherent() fails.

Since commit 3bfd9103c7af ("spi: spi-mtk-nor: Add power management
support"), the same happens if the call to mtk_nor_enable_clk() fails.

Fix by switching over to the new devm_spi_alloc_master() helper.

Fixes: 881d1ee9fe81 ("spi: add support for mediatek spi-nor controller")
Signed-off-by: Lukas Wunner <lukas@...ner.de>
Reviewed-by: Ikjoon Jang <ikjn@...omium.org>
Cc: <stable@...r.kernel.org> # v5.7+: 5e844cc37a5c: spi: Introduce device-managed SPI controller allocation
Cc: <stable@...r.kernel.org> # v5.7+
Cc: Chuanhong Guo <gch981213@...il.com>
Link: https://lore.kernel.org/r/d5b9f0289465394e73dedb8ec51e180a8f1dffc9.1607286887.git.lukas@wunner.de
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/spi/spi-mtk-nor.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/spi/spi-mtk-nor.c
+++ b/drivers/spi/spi-mtk-nor.c
@@ -768,7 +768,7 @@ static int mtk_nor_probe(struct platform
 		return -EINVAL;
 	}
 
-	ctlr = spi_alloc_master(&pdev->dev, sizeof(*sp));
+	ctlr = devm_spi_alloc_master(&pdev->dev, sizeof(*sp));
 	if (!ctlr) {
 		dev_err(&pdev->dev, "failed to allocate spi controller\n");
 		return -ENOMEM;