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authorLinus Torvalds <torvalds@linux-foundation.org>2020-03-29 10:07:00 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-03-29 10:07:00 -0700
commit01af08bd24edf50b2d9e06f18df13cb8d0d645b7 (patch)
treea3917cdfe93fb13caf27263bec1a7b48441e4084
parente595dd94515ed6bc5ba38fce0f9598db8c0ee9a9 (diff)
parentdf81dfcfd6991d547653d46c051bac195cd182c1 (diff)
downloadlinux-01af08bd24edf50b2d9e06f18df13cb8d0d645b7.tar.bz2
Merge tag 'irq-urgent-2020-03-29' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull irq fix from Thomas Gleixner: "A single bugfix to prevent reference leaks in irq affinity notifiers" * tag 'irq-urgent-2020-03-29' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: genirq: Fix reference leaks on irq affinity notifiers
-rw-r--r--kernel/irq/manage.c11
1 files changed, 9 insertions, 2 deletions
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 7eee98c38f25..fe40c658f86f 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -323,7 +323,11 @@ int irq_set_affinity_locked(struct irq_data *data, const struct cpumask *mask,
if (desc->affinity_notify) {
kref_get(&desc->affinity_notify->kref);
- schedule_work(&desc->affinity_notify->work);
+ if (!schedule_work(&desc->affinity_notify->work)) {
+ /* Work was already scheduled, drop our extra ref */
+ kref_put(&desc->affinity_notify->kref,
+ desc->affinity_notify->release);
+ }
}
irqd_set(data, IRQD_AFFINITY_SET);
@@ -423,7 +427,10 @@ irq_set_affinity_notifier(unsigned int irq, struct irq_affinity_notify *notify)
raw_spin_unlock_irqrestore(&desc->lock, flags);
if (old_notify) {
- cancel_work_sync(&old_notify->work);
+ if (cancel_work_sync(&old_notify->work)) {
+ /* Pending work had a ref, put that one too */
+ kref_put(&old_notify->kref, old_notify->release);
+ }
kref_put(&old_notify->kref, old_notify->release);
}