diff options
| author | Xiyu Yang <xiyuyang19@fudan.edu.cn> | 2020-04-25 20:48:35 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-06-24 17:50:10 +0200 |
| commit | a1359b9fdd8d8748ae20c5a78ece513a2d4e9691 (patch) | |
| tree | abec350a2b6f0a63e05ae2be97418004102b3746 /sound/soc/ti | |
| parent | 8908c555e06e5ccb56869a405d9e22caffad646c (diff) | |
ASoC: davinci-mcasp: Fix dma_chan refcnt leak when getting dma type
[ Upstream commit a697ae6ea56e23397341b027098c1b11d9ab13da ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'sound/soc/ti')
| -rw-r--r-- | sound/soc/ti/davinci-mcasp.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/sound/soc/ti/davinci-mcasp.c b/sound/soc/ti/davinci-mcasp.c index 7aa3c32e4a49..0541071f454b 100644 --- a/sound/soc/ti/davinci-mcasp.c +++ b/sound/soc/ti/davinci-mcasp.c @@ -1875,8 +1875,10 @@ 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, |