linux-kernel - [PATCH 2/3] gpio: sta2x11: check the return value of irq_alloc_generic

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1495701458-12444-3-git-send-email-brgl@bgdev.pl>
Date:   Thu, 25 May 2017 10:37:37 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Alexandre Courbot <gnurou@...il.com>
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <brgl@...ev.pl>
Subject: [PATCH 2/3] gpio: sta2x11: check the return value of irq_alloc_generic_chip()

This function can fail, so check the return value before dereferencing
the returned pointer.

Signed-off-by: Bartosz Golaszewski <brgl@...ev.pl>
---
 drivers/gpio/gpio-sta2x11.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/gpio/gpio-sta2x11.c b/drivers/gpio/gpio-sta2x11.c
index 39df062..9e70516 100644
--- a/drivers/gpio/gpio-sta2x11.c
+++ b/drivers/gpio/gpio-sta2x11.c
@@ -320,13 +320,16 @@ static irqreturn_t gsta_gpio_handler(int irq, void *dev_id)
 	return ret;
 }
 
-static void gsta_alloc_irq_chip(struct gsta_gpio *chip)
+static int gsta_alloc_irq_chip(struct gsta_gpio *chip)
 {
 	struct irq_chip_generic *gc;
 	struct irq_chip_type *ct;
 
 	gc = irq_alloc_generic_chip(KBUILD_MODNAME, 1, chip->irq_base,
 				     chip->reg_base, handle_simple_irq);
+	if (!gc)
+		return -ENOMEM;
+
 	gc->private = chip;
 	ct = gc->chip_types;
 
@@ -350,6 +353,8 @@ static void gsta_alloc_irq_chip(struct gsta_gpio *chip)
 		}
 		gc->irq_cnt = i - gc->irq_base;
 	}
+
+	return 0;
 }
 
 /* The platform device used here is instantiated by the MFD device */
@@ -400,7 +405,10 @@ static int gsta_probe(struct platform_device *dev)
 		return err;
 	}
 	chip->irq_base = err;
-	gsta_alloc_irq_chip(chip);
+
+	err = gsta_alloc_irq_chip(chip);
+	if (err)
+		return err;
 
 	err = devm_request_irq(&dev->dev, pdev->irq, gsta_gpio_handler,
 			       IRQF_SHARED, KBUILD_MODNAME, chip);
-- 
2.9.3