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

[Kangjie Lu]

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 <k...@umn.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