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Learn why this is important at https://aka.ms/LearnAboutSenderIdentification ] > > 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 > --- > 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); Please also clear that global variable because when the driver is re-bound there will be old reference to rx_chan which shouldn't be there. if (rx_chan) { mbox_free_channel(rx_chan); rx_chan = NULL; } And please send both patches as one thread. Thanks, Michal