linux-kernel - [PATCH 4.19 100/134] gpio: exar: add a check for the return value of ida_simple

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Message-Id: <20190401170053.592098804@linuxfoundation.org>
Date:   Mon,  1 Apr 2019 19:02:16 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Kangjie Lu <kjlu@....edu>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: [PATCH 4.19 100/134] gpio: exar: add a check for the return value of ida_simple_get fails

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Kangjie Lu <kjlu@....edu>

commit 7ecced0934e574b528a1ba6c237731e682216a74 upstream.

ida_simple_get may fail and return a negative error number.
The fix checks its return value; if it fails, go to err_destroy.

Cc: <stable@...r.kernel.org>
Signed-off-by: Kangjie Lu <kjlu@....edu>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpio/gpio-exar.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/gpio/gpio-exar.c
+++ b/drivers/gpio/gpio-exar.c
@@ -148,6 +148,8 @@ static int gpio_exar_probe(struct platfo
 	mutex_init(&exar_gpio->lock);
 
 	index = ida_simple_get(&ida_index, 0, 0, GFP_KERNEL);
+	if (index < 0)
+		goto err_destroy;
 
 	sprintf(exar_gpio->name, "exar_gpio%d", index);
 	exar_gpio->gpio_chip.label = exar_gpio->name;