linux-kernel - [PATCH] thunderbolt: property: fix a NULL pointer dereference

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Message-Id: <20190312083328.7793-1-kjlu@umn.edu>
Date:   Tue, 12 Mar 2019 03:33:28 -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 NULL pointer dereference

In case kzalloc fails, the fix releases resources and returns
-ENOMEM to avoid the NULL pointer dereference.

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/thunderbolt/property.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/thunderbolt/property.c b/drivers/thunderbolt/property.c
index b2f0d6386cee..ee76449524a3 100644
--- a/drivers/thunderbolt/property.c
+++ b/drivers/thunderbolt/property.c
@@ -548,6 +548,11 @@ int tb_property_add_data(struct tb_property_dir *parent, const char *key,
 
 	property->length = size / 4;
 	property->value.data = kzalloc(size, GFP_KERNEL);
+	if (!property->value.data) {
+		kfree(property);
+		return -ENOMEM;
+	}
+
 	memcpy(property->value.data, buf, buflen);
 
 	list_add_tail(&property->list, &parent->properties);
-- 
2.17.1