From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 971603212 for ; Tue, 7 Feb 2023 13:13:13 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 03A4BC433EF; Tue, 7 Feb 2023 13:13:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1675775593; bh=c3wjTMKDrHaQMQaifRoZbOSfF8kOcrUC6GKmohEviFs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ecPpeEqPs4bUJfgkcK3qoPCagrAtyvIdjBRUsWxgJoYQw8oqc4oxrtpy6y/PW3Cop 6C9bO6dJezidwUcjsS7u+VMGXYV7pfwnlUurkeTWzfAHicZOjuPG3CEIgorxGKqtqk fGxYzvp7m6Le813dHMv1USi/pz9+lX66F/AeEZdU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Thomas Gleixner , stable , Marc Zyngier Subject: [PATCH 5.15 092/120] kernel/irq/irqdomain.c: fix memory leak with using debugfs_lookup() Date: Tue, 7 Feb 2023 13:57:43 +0100 Message-Id: <20230207125622.680603686@linuxfoundation.org> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230207125618.699726054@linuxfoundation.org> References: <20230207125618.699726054@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Greg Kroah-Hartman 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 Cc: stable Reviewed-by: Marc Zyngier Link: https://lore.kernel.org/r/20230202151554.2310273-1-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman --- kernel/irq/irqdomain.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/kernel/irq/irqdomain.c +++ b/kernel/irq/irqdomain.c @@ -1913,7 +1913,7 @@ static void debugfs_add_domain_dir(struc 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)