kernel/irq/irqdomain.c: fix memory leak with using debugfs_lookup()

commit d83d7ed260283560700d4034a80baad46620481b upstream.

When calling debugfs_lookup() the result must have dput() called on it,
otherwise the memory will leak over time.  To make things simpler, just
call debugfs_lookup_and_remove() instead which handles all of the logic
at once.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: stable <stable@kernel.org>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230202151554.2310273-1-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 035e3038c4de4d2f772ab95954ccf53af24bc9be..b1e6ca98d0af49db53f6631cfc8819cab76ab588 100644 (file)
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -1913,7 +1913,7 @@ static void debugfs_add_domain_dir(struct irq_domain *d)
 
 static void debugfs_remove_domain_dir(struct irq_domain *d)
 {
-       debugfs_remove(debugfs_lookup(d->name, domain_dir));
+       debugfs_lookup_and_remove(d->name, domain_dir);
 }
 
 void __init irq_domain_debugfs_init(struct dentry *root)