linux-kernel - [PATCH 1/2] dmaengine: qcom_hidma: fix memory leak on probe failure

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Message-Id: <20250601224231.24317-2-qasdev00@gmail.com>
Date: Sun,  1 Jun 2025 23:42:30 +0100
From: Qasim Ijaz <qasdev00@...il.com>
To: Sinan Kaya <okaya@...nel.org>,
	Vinod Koul <vkoul@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-arm-msm@...r.kernel.org,
	dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Qasim Ijaz <qasdev00@...il.com>,
	stable@...r.kernel.org
Subject: [PATCH 1/2] dmaengine: qcom_hidma: fix memory leak on probe failure

hidma_ll_init() is invoked to create and initialise a struct hidma_lldev
object during hidma probe. During this a FIFO buffer is allocated, but
if some failure occurs after (like hidma_ll_setup failure) we should
clean up the FIFO.

Fixes: d1615ca2e085 ("dmaengine: qcom_hidma: implement lower level hardware interface")
Cc: stable@...r.kernel.org
Signed-off-by: Qasim Ijaz <qasdev00@...il.com>
---
 drivers/dma/qcom/hidma_ll.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/qcom/hidma_ll.c b/drivers/dma/qcom/hidma_ll.c
index 53244e0e34a3..fee448499777 100644
--- a/drivers/dma/qcom/hidma_ll.c
+++ b/drivers/dma/qcom/hidma_ll.c
@@ -788,8 +788,10 @@ struct hidma_lldev *hidma_ll_init(struct device *dev, u32 nr_tres,
 		return NULL;
 
 	rc = hidma_ll_setup(lldev);
-	if (rc)
+	if (rc) {
+		kfifo_free(&lldev->handoff_fifo);
 		return NULL;
+	}
 
 	spin_lock_init(&lldev->lock);
 	tasklet_setup(&lldev->task, hidma_ll_tre_complete);
-- 
2.39.5