[PATCH 2/2] soc: xilinx: Shutdown and free rx mailbox channel

[Prasanna Kumar T S M <ptsm@linux.microsoft.com>]

A mbox rx channel is requested using mbox_request_channel_byname() in
probe. In remove callback, the rx mailbox channel is cleaned up when the
rx_chan is NULL due to incorrect condition check. The mailbox channel is
not shutdown and it can receive messages even after the device removal.
This leads to use after free. Also the channel resources are not freed.
Fix this by checking the rx_chan correctly.

Fixes: ffdbae28d9d1 ("drivers: soc: xilinx: Use mailbox IPI callback")
Signed-off-by: Prasanna Kumar T S M <ptsm@linux.microsoft.com>
---
 drivers/soc/xilinx/zynqmp_power.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/soc/xilinx/zynqmp_power.c b/drivers/soc/xilinx/zynqmp_power.c
index aa35b63b45a3..5086c1e6797e 100644
--- a/drivers/soc/xilinx/zynqmp_power.c
+++ b/drivers/soc/xilinx/zynqmp_power.c
@@ -398,7 +398,7 @@ static void zynqmp_pm_remove(struct platform_device *pdev)
 {
 	sysfs_remove_file(&pdev->dev.kobj, &dev_attr_suspend_mode.attr);
 
-	if (!rx_chan)
+	if (rx_chan)
 		mbox_free_channel(rx_chan);
 }
 
-- 
2.49.0