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ASoC: davinci-mcasp: Fix dma_chan refcnt leak when getting dma type 

davinci_mcasp_get_dma_type() invokes dma_request_chan(), which returns a
reference of the specified dma_chan object to "chan" with increased
refcnt.

When davinci_mcasp_get_dma_type() returns, local variable "chan" becomes
invalid, so the refcount should be decreased to keep refcount balanced.

The reference counting issue happens in one exception handling path of
davinci_mcasp_get_dma_type(). When chan device is NULL, the function
forgets to decrease the refcnt increased by dma_request_chan(), causing
a refcnt leak.

Fix this issue by calling dma_release_channel() when chan device is
NULL.

Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn>
Signed-off-by: Xin Tan <tanxin.ctf@gmail.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Link: https://lore.kernel.org/r/1587818916-38730-1-git-send-email-xiyuyang19@fudan.edu.cn
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Xiyu Yang 2020-04-25 20:48:35 +08:00 committed by Mark Brown
parent 1fecbb71fe
commit a697ae6ea5
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 3 additions and 1 deletions
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4
sound/soc/ti/davinci-mcasp.c
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@ -1896,8 +1896,10 @@ static int davinci_mcasp_get_dma_type(struct davinci_mcasp *mcasp)
PTR_ERR(chan));
return PTR_ERR(chan);
}
if (WARN_ON(!chan->device || !chan->device->dev))
if (WARN_ON(!chan->device || !chan->device->dev)) {
dma_release_channel(chan);
return -EINVAL;
}
if (chan->device->dev->of_node)
ret = of_property_read_string(chan->device->dev->of_node,