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Subject[PATCH 4.18 119/235] mei: bus: need to unlink client before freeing
Date
4.18-stable review patch.  If anyone has any objections, please let me know.

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

From: Tomas Winkler <tomas.winkler@intel.com>

commit 34f1166afd67f9f48a08c52f36180048908506a4 upstream.

In case a client fails to connect in mei_cldev_enable(), the
caller won't call the mei_cldev_disable leaving the client
in a linked stated. Upon driver unload the client structure
will be freed in mei_cl_bus_dev_release(), leaving a stale pointer
on a fail_list. This will eventually end up in crash
during power down flow in mei_cl_set_disonnected().

RIP: mei_cl_set_disconnected+0x5/0x260[mei]
Call trace:
mei_cl_all_disconnect+0x22/0x30
mei_reset+0x194/0x250
__synchronize_hardirq+0x43/0x50
_cond_resched+0x15/0x30
mei_me_intr_clear+0x20/0x100
mei_stop+0x76/0xb0
mei_me_shutdown+0x3f/0x80
pci_device_shutdown+0x34/0x60
kernel_restart+0x0e/0x30

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=200455
Fixes: 'c110cdb17148 ("mei: bus: make a client pointer always available")'
Cc: <stable@vger.kernel.org> 4.10+
Tested-by: Georg Müller <georgmueller@gmx.net>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/misc/mei/bus.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)

--- a/drivers/misc/mei/bus.c
+++ b/drivers/misc/mei/bus.c
@@ -505,17 +505,15 @@ int mei_cldev_enable(struct mei_cl_devic

cl = cldev->cl;

+ mutex_lock(&bus->device_lock);
if (cl->state == MEI_FILE_UNINITIALIZED) {
- mutex_lock(&bus->device_lock);
ret = mei_cl_link(cl);
- mutex_unlock(&bus->device_lock);
if (ret)
- return ret;
+ goto out;
/* update pointers */
cl->cldev = cldev;
}

- mutex_lock(&bus->device_lock);
if (mei_cl_is_connected(cl)) {
ret = 0;
goto out;
@@ -859,12 +857,13 @@ static void mei_cl_bus_dev_release(struc

mei_me_cl_put(cldev->me_cl);
mei_dev_bus_put(cldev->bus);
+ mei_cl_unlink(cldev->cl);
kfree(cldev->cl);
kfree(cldev);
}

static const struct device_type mei_cl_device_type = {
- .release = mei_cl_bus_dev_release,
+ .release = mei_cl_bus_dev_release,
};

/**

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