From: Lee Jones <lee.jones@linaro.org>
Date: Wed, 23 Mar 2016 14:43:42 +0000 (+0000)
Subject: mailbox: mailbox-test: Prevent memory leak
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d1c2f87c9a8f79fa8816bbe7de98da38eae2be5e;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

mailbox: mailbox-test: Prevent memory leak

If we set the Signal twice or more, without using it as part of a message,
memory will be re-allocated and the pointer over-written.  Prevent this
potential leak by only allocating memory when there isn't any already.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
---

diff --git a/drivers/mailbox/mailbox-test.c b/drivers/mailbox/mailbox-test.c
index 5f4b439fd45a..58d04726cdd7 100644
--- a/drivers/mailbox/mailbox-test.c
+++ b/drivers/mailbox/mailbox-test.c
@@ -59,9 +59,12 @@ static ssize_t mbox_test_signal_write(struct file *filp,
 		return -EINVAL;
 	}
 
-	tdev->signal = kzalloc(MBOX_MAX_SIG_LEN, GFP_KERNEL);
-	if (!tdev->signal)
-		return -ENOMEM;
+	/* Only allocate memory if we need to */
+	if (!tdev->signal) {
+		tdev->signal = kzalloc(MBOX_MAX_SIG_LEN, GFP_KERNEL);
+		if (!tdev->signal)
+			return -ENOMEM;
+	}
 
 	if (copy_from_user(tdev->signal, userbuf, count)) {
 		kfree(tdev->signal);