linux-kernel - [PATCH] thunderbolt: property: fix a buffer overflow and a missing check

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Message-Id: <20190324224916.1389-1-kjlu@umn.edu>
Date:   Sun, 24 Mar 2019 17:49:16 -0500
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Andreas Noever <andreas.noever@...il.com>,
        Michael Jamet <michael.jamet@...el.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Yehezkel Bernat <YehezkelShB@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] thunderbolt: property: fix a buffer overflow and a missing check

First, no memory is allocated for "property->value.text"; the
following strcpy will lead to a buffer overflow.

Second, no check is enforced for the return value of kzalloc,
which may lead to NULL-pointer dereference.

The patch fixes the two issues.

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/thunderbolt/property.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/thunderbolt/property.c b/drivers/thunderbolt/property.c
index 841314deb446..d5b0cdb8f0b1 100644
--- a/drivers/thunderbolt/property.c
+++ b/drivers/thunderbolt/property.c
@@ -587,7 +587,12 @@ int tb_property_add_text(struct tb_property_dir *parent, const char *key,
 		return -ENOMEM;
 
 	property->length = size / 4;
-	property->value.data = kzalloc(size, GFP_KERNEL);
+	property->value.text = kzalloc(size, GFP_KERNEL);
+	if (!property->value.text) {
+		kfree(property);
+		return -ENOMEM;
+	}
+
 	strcpy(property->value.text, text);
 
 	list_add_tail(&property->list, &parent->properties);
-- 
2.17.1