linux-kernel - [PATCH] dmaengine: qcom_hidma: avoid freeing an uninitialized pointer

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Date:   Thu, 10 Aug 2017 18:54:25 +0300
From:   Anton Vasilyev <vasilyev@...ras.ru>
To:     Andy Gross <andy.gross@...aro.org>
Cc:     Anton Vasilyev <vasilyev@...ras.ru>,
        David Brown <david.brown@...aro.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Vinod Koul <vinod.koul@...el.com>,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        ldv-project@...uxtesting.org
Subject: [PATCH] dmaengine: qcom_hidma: avoid freeing an uninitialized pointer

If device_node np doesn't contain child or first child doesn't have
property "reg" then hidma_mgmt_of_populate_channels() perfoms
deallocation on uninitialized local variable res.

The patch adds res initialization by NULL.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Anton Vasilyev <vasilyev@...ras.ru>
---
 drivers/dma/qcom/hidma_mgmt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/qcom/hidma_mgmt.c b/drivers/dma/qcom/hidma_mgmt.c
index 5a0991b..89e36e3 100644
--- a/drivers/dma/qcom/hidma_mgmt.c
+++ b/drivers/dma/qcom/hidma_mgmt.c
@@ -354,7 +354,7 @@ static int __init hidma_mgmt_of_populate_channels(struct device_node *np)
 	struct platform_device_info pdevinfo;
 	struct of_phandle_args out_irq;
 	struct device_node *child;
-	struct resource *res;
+	struct resource *res = NULL;
 	const __be32 *cell;
 	int ret = 0, size, i, num;
 	u64 addr, addr_size;
-- 
2.7.4