linux-kernel - [PATCH] dmaengine: plx_dma: Fix potential double free in plx_dma

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Message-Id: <20221220061752.1120381-1-linmq006@gmail.com>
Date:   Tue, 20 Dec 2022 10:17:51 +0400
From:   Miaoqian Lin <linmq006@...il.com>
To:     Logan Gunthorpe <logang@...tatee.com>,
        Vinod Koul <vkoul@...nel.org>,
        Dan Carpenter <error27@...il.com>, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     linmq006@...il.com
Subject: [PATCH] dmaengine: plx_dma: Fix potential double free in plx_dma_create

When all references are dropped, callback function plx_dma_release()
for put_device() will call kfree(plxdev) to release memory.
Fix the error path to fix the possible double free.

Fixes: 07503e6aefe4 ("dmaengine: plx_dma: add a missing put_device() on error path")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
Please correct me if I make mistakes, thanks for your review.
---
 drivers/dma/plx_dma.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/plx_dma.c b/drivers/dma/plx_dma.c
index 12725fa1655f..bce724ff4e16 100644
--- a/drivers/dma/plx_dma.c
+++ b/drivers/dma/plx_dma.c
@@ -546,8 +546,9 @@ static int plx_dma_create(struct pci_dev *pdev)
 	return 0;
 
 put_device:
-	put_device(&pdev->dev);
 	free_irq(pci_irq_vector(pdev, 0),  plxdev);
+	put_device(&pdev->dev);
+	return rc;
 free_plx:
 	kfree(plxdev);
 
-- 
2.25.1