[PATCH 4.9 067/101] rpmsg: smd: do not use mananged resources for endpoints and channels

From: Greg Kroah-Hartman
Date: Sun Jul 01 2018 - 14:12:44 EST


4.9-stable review patch. If anyone has any objections, please let me know.

------------------

From: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>

commit 4a2e84c6ed85434ce7843e4844b4d3263f7e233b upstream.

All the managed resources would be freed by the time release function
is invoked. Handling such memory in qcom_smd_edge_release() would do
bad things.

Found this issue while testing Audio usecase where the dsp is started up
and shutdown in a loop.

This patch fixes this issue by using simple kzalloc for allocating
channel->name and channel which is then freed in qcom_smd_edge_release().

Without this patch restarting a remoteproc would crash the system.
Fixes: 53e2822e56c7 ("rpmsg: Introduce Qualcomm SMD backend")
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx>
Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/rpmsg/qcom_smd.c | 18 +++++++++---------
1 file changed, 9 insertions(+), 9 deletions(-)

--- a/drivers/rpmsg/qcom_smd.c
+++ b/drivers/rpmsg/qcom_smd.c
@@ -1006,12 +1006,12 @@ static struct qcom_smd_channel *qcom_smd
void *info;
int ret;

- channel = devm_kzalloc(&edge->dev, sizeof(*channel), GFP_KERNEL);
+ channel = kzalloc(sizeof(*channel), GFP_KERNEL);
if (!channel)
return ERR_PTR(-ENOMEM);

channel->edge = edge;
- channel->name = devm_kstrdup(&edge->dev, name, GFP_KERNEL);
+ channel->name = kstrdup(name, GFP_KERNEL);
if (!channel->name)
return ERR_PTR(-ENOMEM);

@@ -1061,8 +1061,8 @@ static struct qcom_smd_channel *qcom_smd
return channel;

free_name_and_channel:
- devm_kfree(&edge->dev, channel->name);
- devm_kfree(&edge->dev, channel);
+ kfree(channel->name);
+ kfree(channel);

return ERR_PTR(ret);
}
@@ -1279,13 +1279,13 @@ static int qcom_smd_parse_edge(struct de
*/
static void qcom_smd_edge_release(struct device *dev)
{
- struct qcom_smd_channel *channel;
+ struct qcom_smd_channel *channel, *tmp;
struct qcom_smd_edge *edge = to_smd_edge(dev);

- list_for_each_entry(channel, &edge->channels, list) {
- SET_RX_CHANNEL_INFO(channel, state, SMD_CHANNEL_CLOSED);
- SET_RX_CHANNEL_INFO(channel, head, 0);
- SET_RX_CHANNEL_INFO(channel, tail, 0);
+ list_for_each_entry_safe(channel, tmp, &edge->channels, list) {
+ list_del(&channel->list);
+ kfree(channel->name);
+ kfree(channel);
}

kfree(edge);