linux-kernel - [RFC 1/2] irqchip/gic-v3-its: Free collections if its domain initialization fails

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Date:   Tue, 22 Jun 2021 23:53:12 +0800
From:   Boqun Feng <boqun.feng@...il.com>
To:     Marc Zyngier <maz@...nel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Boqun Feng <boqun.feng@...il.com>
Subject: [RFC 1/2] irqchip/gic-v3-its: Free collections if its domain initialization fails

ITS collections are allocated before its_init_domain() called in
its_init(), therefore if its_init_domain() fails, the collections need
to be freed. This fixes a potential memory leak.

Signed-off-by: Boqun Feng <boqun.feng@...il.com>
---
 drivers/irqchip/irq-gic-v3-its.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 2e6923c2c8a8..1916ac5d6371 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -2931,6 +2931,12 @@ static int its_alloc_collections(struct its_node *its)
 	return 0;
 }
 
+static void its_free_collections(struct its_node *its)
+{
+	if (its)
+		kfree(its->collections);
+}
+
 static struct page *its_allocate_pending_table(gfp_t gfp_flags)
 {
 	struct page *pend_page;
@@ -5090,7 +5096,7 @@ static int __init its_probe_one(struct resource *res,
 
 	err = its_init_domain(handle, its);
 	if (err)
-		goto out_free_tables;
+		goto out_free_collections;
 
 	raw_spin_lock(&its_lock);
 	list_add(&its->entry, &its_nodes);
@@ -5098,6 +5104,8 @@ static int __init its_probe_one(struct resource *res,
 
 	return 0;
 
+out_free_collections:
+	its_free_collections(its);
 out_free_tables:
 	its_free_tables(its);
 out_free_cmd:
-- 
2.30.2