From: Mike Lockwood <lockwood@android.com>
Date: Sat, 17 Apr 2010 16:01:35 +0000 (-0400)
Subject: Staging: android: timed_gpio: Properly discard invalid timeout values.
X-Git-Tag: firefly_0821_release~11615
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=a7f5cb901df253cb3aed7a369298a95703cc5995;p=firefly-linux-kernel-4.4.55.git

Staging: android: timed_gpio: Properly discard invalid timeout values.

The timed output device never previously checked the return value of sscanf,
resulting in an uninitialized int being passed to enable() if input value
was invalid.

Signed-off-by: Mike Lockwood <lockwood@android.com>
---

diff --git a/drivers/staging/android/timed_output.c b/drivers/staging/android/timed_output.c
index 62e79180421b..f373422308e0 100644
--- a/drivers/staging/android/timed_output.c
+++ b/drivers/staging/android/timed_output.c
@@ -41,7 +41,9 @@ static ssize_t enable_store(
 	struct timed_output_dev *tdev = dev_get_drvdata(dev);
 	int value;
 
-	sscanf(buf, "%d", &value);
+	if (sscanf(buf, "%d", &value) != 1)
+		return -EINVAL;
+
 	tdev->enable(tdev, value);
 
 	return size;