linux-kernel - [PATCH v2] gnss: fix potential error pointer dereference

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Message-ID: <20180703122531.5mgay63srlurlkvo@mwanda>
Date:   Tue, 3 Jul 2018 15:25:31 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Johan Hovold <johan@...nel.org>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH v2] gnss: fix potential error pointer dereference

The gnss_allocate_device() function returns a mix of NULL and error
pointers on error.  It should only return one or the other.  Since the
callers both check for NULL, I've modified it to return NULL on error.

Fixes: 2b6a44035143 ("gnss: add GNSS receiver subsystem")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Acked-by: Johan Hovold <johan@...nel.org>
---
v2: Use the correct Fixes tag.

diff --git a/drivers/gnss/core.c b/drivers/gnss/core.c
index f30ef8338b3a..4291a0dd22aa 100644
--- a/drivers/gnss/core.c
+++ b/drivers/gnss/core.c
@@ -235,7 +235,7 @@ struct gnss_device *gnss_allocate_device(struct device *parent)
 	id = ida_simple_get(&gnss_minors, 0, GNSS_MINORS, GFP_KERNEL);
 	if (id < 0) {
 		kfree(gdev);
-		return ERR_PTR(id);
+		return NULL;
 	}
 
 	gdev->id = id;
@@ -270,7 +270,7 @@ struct gnss_device *gnss_allocate_device(struct device *parent)
 err_put_device:
 	put_device(dev);
 
-	return ERR_PTR(-ENOMEM);
+	return NULL;
 }
 EXPORT_SYMBOL_GPL(gnss_allocate_device);