linux-kernel - [PATCH] drivers: watchdog: exar

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Date:   Thu, 13 Oct 2022 15:24:39 +0530
From:   Manank Patel <pmanank200502@...il.com>
To:     linux@...ck-us.net
Cc:     linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
        Manank Patel <pmanank200502@...il.com>
Subject: [PATCH] drivers: watchdog: exar_wdt.c fix use after free

fix use after free by storing the result of PTR_ERR(n->pdev)
to a local variable before returning.

Signed-off-by: Manank Patel <pmanank200502@...il.com>
---
 drivers/watchdog/exar_wdt.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/watchdog/exar_wdt.c b/drivers/watchdog/exar_wdt.c
index 35058d8b21bc..7c61ff343271 100644
--- a/drivers/watchdog/exar_wdt.c
+++ b/drivers/watchdog/exar_wdt.c
@@ -355,8 +355,10 @@ static int __init exar_wdt_register(struct wdt_priv *priv, const int idx)
 						    &priv->wdt_res, 1,
 						    priv, sizeof(*priv));
 	if (IS_ERR(n->pdev)) {
+		int err = PTR_ERR(n->pdev);
+
 		kfree(n);
-		return PTR_ERR(n->pdev);
+		return err;
 	}
 
 	list_add_tail(&n->list, &pdev_list);
-- 
2.38.0