linux-kernel - [PATCH] sh: intc: use after free in register_intc

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Message-ID: <45ff88d1-b687-43f4-a022-4e07930cd2d0@stanley.mountain>
Date: Wed, 23 Oct 2024 11:41:59 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Magnus Damm <magnus.damm@...il.com>
Cc: Yoshinori Sato <ysato@...rs.sourceforge.jp>,
	Rich Felker <dalias@...c.org>,
	John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
	"Ricardo B. Marliere" <ricardo@...liere.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Paul Mundt <lethal@...ux-sh.org>, linux-sh@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH] sh: intc: use after free in register_intc_controller()

In the error handling, for this function, we kfree(d) without ever
removing it from the &intc_list which would lead to a use after free.  To
fix this, lets only add it to the list after everything has succeeded.

Fixes: 2dcec7a988a1 ("sh: intc: set_irq_wake() support")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
This patch is highly speculative and I am not able to test it.  Please,
review with care.

 drivers/sh/intc/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/sh/intc/core.c b/drivers/sh/intc/core.c
index 74350b5871dc..ea571eeb3078 100644
--- a/drivers/sh/intc/core.c
+++ b/drivers/sh/intc/core.c
@@ -209,7 +209,6 @@ int __init register_intc_controller(struct intc_desc *desc)
 		goto err0;
 
 	INIT_LIST_HEAD(&d->list);
-	list_add_tail(&d->list, &intc_list);
 
 	raw_spin_lock_init(&d->lock);
 	INIT_RADIX_TREE(&d->tree, GFP_ATOMIC);
@@ -369,6 +368,7 @@ int __init register_intc_controller(struct intc_desc *desc)
 
 	d->skip_suspend = desc->skip_syscore_suspend;
 
+	list_add_tail(&d->list, &intc_list);
 	nr_intc_controllers++;
 
 	return 0;
-- 
2.45.2