HID: sony: Fix race condition between rumble and device remove.

Valve reported a kernel crash on Ubuntu 18.04 when disconnecting a DS4
gamepad while rumble is enabled. This issue is reproducible with a
frequency of 1 in 3 times in the game Borderlands 2 when using an
automatic weapon, which triggers many rumble operations.

We found the issue to be a race condition between sony_remove and the
final device destruction by the HID / input system. The problem was
that sony_remove didn't clean some of its work_item state in
"struct sony_sc". After sony_remove work, the corresponding evdev
node was around for sufficient time for applications to still queue
rumble work after "sony_remove".

On pre-4.19 kernels the race condition caused a kernel crash due to a
NULL-pointer dereference as "sc->output_report_dmabuf" got freed during
sony_remove. On newer kernels this crash doesn't happen due the buffer
now being allocated using devm_kzalloc. However we can still queue work,
while the driver is an undefined state.

This patch fixes the described problem, by guarding the work_item
"state_worker" with an initialized variable, which we are setting back
to 0 on cleanup.

Signed-off-by: Roderick Colenbrander <roderick.colenbrander@sony.com>
CC: stable@vger.kernel.org
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 12 insertions, 3 deletions

diff --git a/drivers/hid/hid-sony.c b/drivers/hid/hid-sony.c
index 93942063b51b..49dd2d905c7f 100644
--- a/drivers/hid/hid-sony.c
+++ b/drivers/hid/hid-sony.c
@@ -585,10 +585,14 @@ static void sony_set_leds(struct sony_sc *sc);
 static inline void sony_schedule_work(struct sony_sc *sc,
                                       enum sony_worker which)
 {
+        unsigned long flags;
+
         switch (which) {
         case SONY_WORKER_STATE:
-                if (!sc->defer_initialization)
+                spin_lock_irqsave(&sc->lock, flags);
+                if (!sc->defer_initialization && sc->state_worker_initialized)
                         schedule_work(&sc->state_worker);
+                spin_unlock_irqrestore(&sc->lock, flags);
                 break;
         case SONY_WORKER_HOTPLUG:
                 if (sc->hotplug_worker_initialized)
@@ -2558,13 +2562,18 @@ static inline void sony_init_output_report(struct sony_sc *sc,
 
 static inline void sony_cancel_work_sync(struct sony_sc *sc)
 {
+        unsigned long flags;
+
         if (sc->hotplug_worker_initialized)
                 cancel_work_sync(&sc->hotplug_worker);
-        if (sc->state_worker_initialized)
+        if (sc->state_worker_initialized) {
+                spin_lock_irqsave(&sc->lock, flags);
+                sc->state_worker_initialized = 0;
+                spin_unlock_irqrestore(&sc->lock, flags);
                 cancel_work_sync(&sc->state_worker);
+        }
 }
 
-
 static int sony_input_configured(struct hid_device *hdev,
                                         struct hid_input *hidinput)
 {