linux-kernel - [PATCH AUTOSEL 4.19 3/4] dmaengine: imx-sdma: Fix a possible memory leak in sdma_transfer

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Message-Id: <20230124134357.637945-3-sashal@kernel.org>
Date:   Tue, 24 Jan 2023 08:43:56 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Hui Wang <hui.wang@...onical.com>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Vinod Koul <vkoul@...nel.org>, Sasha Levin <sashal@...nel.org>,
        shawnguo@...nel.org, dmaengine@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH AUTOSEL 4.19 3/4] dmaengine: imx-sdma: Fix a possible memory leak in sdma_transfer_init

From: Hui Wang <hui.wang@...onical.com>

[ Upstream commit 1417f59ac0b02130ee56c0c50794b9b257be3d17 ]

If the function sdma_load_context() fails, the sdma_desc will be
freed, but the allocated desc->bd is forgot to be freed.

We already met the sdma_load_context() failure case and the log as
below:
[ 450.699064] imx-sdma 30bd0000.dma-controller: Timeout waiting for CH0 ready
...

In this case, the desc->bd will not be freed without this change.

Signed-off-by: Hui Wang <hui.wang@...onical.com>
Reviewed-by: Sascha Hauer <s.hauer@...gutronix.de>
Link: https://lore.kernel.org/r/20221130090800.102035-1-hui.wang@canonical.com
Signed-off-by: Vinod Koul <vkoul@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/dma/imx-sdma.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index 709ead443fc5..5794d3120bb8 100644
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -1347,10 +1347,12 @@ static struct sdma_desc *sdma_transfer_init(struct sdma_channel *sdmac,
 		sdma_config_ownership(sdmac, false, true, false);
 
 	if (sdma_load_context(sdmac))
-		goto err_desc_out;
+		goto err_bd_out;
 
 	return desc;
 
+err_bd_out:
+	sdma_free_bd(desc);
 err_desc_out:
 	kfree(desc);
 err_out:
-- 
2.39.0