linux-kernel - [PATCH] dmaengine: jz4780: fix resource leaks on error exit return

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Message-Id: <20160929174505.13913-1-colin.king@canonical.com>
Date:   Thu, 29 Sep 2016 18:45:05 +0100
From:   Colin King <colin.king@...onical.com>
To:     Zubair Lutfullah Kakakhel <Zubair.Kakakhel@...tec.com>,
        Vinod Koul <vinod.koul@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        dmaengine@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] dmaengine: jz4780: fix resource leaks on error exit return

From: Colin Ian King <colin.king@...onical.com>

In two cases when jz4780_dma_setup_hwdesc fails, there is a memory
leak on the allocated desc and associated DMA pools on the error
exit return path.  Fix this by free'ing the resources before
returning.

Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/dma/dma-jz4780.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/dma-jz4780.c b/drivers/dma/dma-jz4780.c
index c36c14c..7373b7a 100644
--- a/drivers/dma/dma-jz4780.c
+++ b/drivers/dma/dma-jz4780.c
@@ -324,8 +324,10 @@ static struct dma_async_tx_descriptor *jz4780_dma_prep_slave_sg(
 					      sg_dma_address(&sgl[i]),
 					      sg_dma_len(&sgl[i]),
 					      direction);
-		if (err < 0)
+		if (err < 0) {
+			jz4780_dma_desc_free(&jzchan->desc->vdesc);
 			return NULL;
+		}
 
 		desc->desc[i].dcm |= JZ_DMA_DCM_TIE;
 
@@ -368,8 +370,10 @@ static struct dma_async_tx_descriptor *jz4780_dma_prep_dma_cyclic(
 	for (i = 0; i < periods; i++) {
 		err = jz4780_dma_setup_hwdesc(jzchan, &desc->desc[i], buf_addr,
 					      period_len, direction);
-		if (err < 0)
+		if (err < 0) {
+			jz4780_dma_desc_free(&jzchan->desc->vdesc);
 			return NULL;
+		}
 
 		buf_addr += period_len;
 
-- 
2.9.3