[PATCH 5.11 231/601] soundwire: stream: fix memory leak in stream config error path

Greg Kroah-Hartman
2021-05-12T17:31:06Z

From: Rander Wang <rander.wang@intel.com>

[ Upstream commit 48f17f96a81763c7c8bf5500460a359b9939359f ]

When stream config is failed, master runtime will release all
slave runtime in the slave_rt_list, but slave runtime is not
added to the list at this time. This patch frees slave runtime
in the config error path to fix the memory leak.

Fixes: 89e590535f32 ("soundwire: Add support for SoundWire stream management")
Signed-off-by: Rander Wang <rander.wang@intel.com>
Reviewed-by: Keyon Jie <yang.jie@intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20210331004610.12242-1-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/soundwire/stream.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/soundwire/stream.c b/drivers/soundwire/stream.c
index 1099b5d1262b..a418c3c7001c 100644
--- a/drivers/soundwire/stream.c
+++ b/drivers/soundwire/stream.c
@@ -1375,8 +1375,16 @@ int sdw_stream_add_slave(struct sdw_slave *slave,
}

ret = sdw_config_stream(&slave->dev, stream, stream_config, true);
- if (ret)
+ if (ret) {
+ /*
+ * sdw_release_master_stream will release s_rt in slave_rt_list in
+ * stream_error case, but s_rt is only added to slave_rt_list
+ * when sdw_config_stream is successful, so free s_rt explicitly
+ * when sdw_config_stream is failed.
+ */
+ kfree(s_rt);
goto stream_error;
+ }

list_add_tail(&s_rt->m_rt_node, &m_rt->slave_rt_list);

--
2.30.2