When tearingdown timesync, and not in arche platform, the state platform
callback is not initialized. That will trigger the following NULL
dereferencing.
CallTrace:
? gb_timesync_platform_unlock_bus+0x11/0x20 [greybus]
gb_timesync_teardown+0x85/0xc0 [greybus]
gb_timesync_svc_remove+0xab/0x190 [greybus]
gb_svc_del+0x29/0x110 [greybus]
gb_hd_del+0x14/0x20 [greybus]
ap_disconnect+0x24/0x60 [gb_es2]
usb_unbind_interface+0x7a/0x2c0
__device_release_driver+0x96/0x150
device_release_driver+0x1e/0x30
bus_remove_device+0xe7/0x130
device_del+0x116/0x230
usb_disable_device+0x97/0x1f0
usb_disconnect+0x80/0x260
hub_event+0x5ca/0x10e0
process_one_work+0x126/0x3b0
worker_thread+0x55/0x4c0
? process_one_work+0x3b0/0x3b0
kthread+0xc4/0xe0
? kthread_park+0xb0/0xb0
ret_from_fork+0x22/0x30
So, fix that by adding checks before use the callback.
Cc: <stable@xxxxxxxxxxxxxxx> # 4.9.x
Signed-off-by: Rui Miguel Silva <rmfrfs@xxxxxxxxx>
---
Greg,
This patch does not contain the "commit <sha> upstream" snippet since you
already removed the timesync code from the -next tree. So, It would never get
there. However this will affect the greybus users of 4.9.x.
drivers/staging/greybus/timesync_platform.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/staging/greybus/timesync_platform.c b/drivers/staging/greybus/timesync_platform.c
index 113f3d6c4b3a..7d3ccc2bc98c 100644
--- a/drivers/staging/greybus/timesync_platform.c
+++ b/drivers/staging/greybus/timesync_platform.c
@@ -45,13 +45,18 @@ u32 gb_timesync_platform_get_clock_rate(void)
int gb_timesync_platform_lock_bus(struct gb_timesync_svc *pdata)
{
+ if (!arche_platform_change_state_cb)
+ return 0;
+
return arche_platform_change_state_cb(ARCHE_PLATFORM_STATE_TIME_SYNC,
pdata);
}
void gb_timesync_platform_unlock_bus(void)
{
- arche_platform_change_state_cb(ARCHE_PLATFORM_STATE_ACTIVE, NULL);
+ if (arche_platform_change_state_cb)
+ arche_platform_change_state_cb(ARCHE_PLATFORM_STATE_ACTIVE,
+ NULL);
}
static const struct of_device_id arch_timer_of_match[] = {
--
2.11.0
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