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From: Lv Yunlong <>
	Lv Yunlong <>
Subject: [PATCH] dma: Fix a double free in dma_async_device_register
Date: Mon, 22 Mar 2021 06:08:36 -0700
Message-ID: <> (raw)

In dma_async_device_register, in the loop
list_for_each_entry(chan, &device->channels, device_node).
If __dma_async_device_channel_register(device, chan) failed
and it colud free chan->local and return err.

But in the err_out branch, it will free chan->local again.
My patch sets chan->local to NULL after it is freed in

Signed-off-by: Lv Yunlong <>
 drivers/dma/dmaengine.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index fe6a460c4373..af3ee288bc11 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -1086,6 +1086,7 @@ static int __dma_async_device_channel_register(struct dma_device *device,
+	chan->local = NULL;
 	return rc;

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Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-22 13:08 Lv Yunlong [this message]
2021-03-30  9:01 Lv Yunlong
2021-03-30 16:05 ` Dave Jiang

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