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genirq/debugfs: Add missing sanity checks to interrupt injection

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commit a740a423c36932695b01a3e920f697bc55b05fec upstream.

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

Fixes: 536e2e34bd00 ("genirq/debugfs: Triggering of interrupts from userspace")
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Marc Zyngier <maz@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20200306130623.500019114@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thomas Gleixner 2020-03-06 14:03:42 +01:00 committed by Greg Kroah-Hartman
parent 6ecc37daf6
commit 3f3700c469
1 changed files with 9 additions and 2 deletions
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11
kernel/irq/debugfs.c
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@ -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;