Commit a740a423 authored by Thomas Gleixner's avatar Thomas Gleixner

genirq/debugfs: Add missing sanity checks to interrupt injection

Interrupts cannot be injected when the interrupt is not activated and when
a replay is already in progress.

Fixes: 536e2e34 ("genirq/debugfs: Triggering of interrupts from userspace")
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Acked-by: default avatarMarc Zyngier <maz@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20200306130623.500019114@linutronix.de
parent b513df67
......@@ -206,8 +206,15 @@ static ssize_t irq_debug_write(struct file *file, const char __user *user_buf,
chip_bus_lock(desc);
raw_spin_lock_irqsave(&desc->lock, flags);
if (irq_settings_is_level(desc) || desc->istate & IRQS_NMI) {
/* Can't do level nor NMIs, sorry */
/*
* Don't allow injection when the interrupt is:
* - Level or NMI type
* - not activated
* - replaying already
*/
if (irq_settings_is_level(desc) ||
!irqd_is_activated(&desc->irq_data) ||
(desc->istate & (IRQS_NMI | IRQS_REPLAY))) {
err = -EINVAL;
} else {
desc->istate |= IRQS_PENDING;
......
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