From fdee7c66c0d7b6869c36b9f9a915abf29ab5b550 Mon Sep 17 00:00:00 2001 From: Prasanna Kumar T S M Date: Thu, 19 Mar 2026 23:04:45 -0700 Subject: [PATCH] soc: xilinx: Shutdown and free rx mailbox channel 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: ffdbae28d9d1a ("drivers: soc: xilinx: Use mailbox IPI callback") Signed-off-by: Prasanna Kumar T S M Signed-off-by: Michal Simek Link: https://lore.kernel.org/r/20260320060445.1541017-1-ptsm@linux.microsoft.com --- drivers/soc/xilinx/zynqmp_power.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/soc/xilinx/zynqmp_power.c b/drivers/soc/xilinx/zynqmp_power.c index 9dd938bd01d8..370e61ac47d8 100644 --- a/drivers/soc/xilinx/zynqmp_power.c +++ b/drivers/soc/xilinx/zynqmp_power.c @@ -389,8 +389,10 @@ 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); + rx_chan = NULL; + } } static const struct of_device_id pm_of_match[] = {