diff mbox series

[v6.1.y-v4.19.y] vhost: use kzalloc() instead of kmalloc() followed by memset()

Message ID 1707110377-1483-1-git-send-email-ajay.kaher@broadcom.com (mailing list archive)
State Not Applicable
Headers show
Series [v6.1.y-v4.19.y] vhost: use kzalloc() instead of kmalloc() followed by memset() | expand

Checks

Context Check Description
netdev/tree_selection success Not a local patch

Commit Message

Ajay Kaher Feb. 5, 2024, 5:19 a.m. UTC 
From: Prathu Baronia <prathubaronia2011@gmail.com>

From: Prathu Baronia <prathubaronia2011@gmail.com>

commit 4d8df0f5f79f747d75a7d356d9b9ea40a4e4c8a9 upstream

Use kzalloc() to allocate new zeroed out msg node instead of
memsetting a node allocated with kmalloc().

Signed-off-by: Prathu Baronia <prathubaronia2011@gmail.com>
Message-Id: <20230522085019.42914-1-prathubaronia2011@gmail.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
[Ajay: This is a security fix as per CVE-2024-0340]
Signed-off-by: Ajay Kaher <ajay.kaher@broadcom.com>
---
 drivers/vhost/vhost.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

Comments

Greg Kroah-Hartman Feb. 13, 2024, 2:54 p.m. UTC | #1 
On Mon, Feb 05, 2024 at 10:49:37AM +0530, Ajay Kaher wrote:
> From: Prathu Baronia <prathubaronia2011@gmail.com>
> 
> From: Prathu Baronia <prathubaronia2011@gmail.com>
> 
> commit 4d8df0f5f79f747d75a7d356d9b9ea40a4e4c8a9 upstream
> 
> Use kzalloc() to allocate new zeroed out msg node instead of
> memsetting a node allocated with kmalloc().
> 
> Signed-off-by: Prathu Baronia <prathubaronia2011@gmail.com>
> Message-Id: <20230522085019.42914-1-prathubaronia2011@gmail.com>
> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
> [Ajay: This is a security fix as per CVE-2024-0340]

And this is why I am so grumpy about Red Hat and CVEs, they know how to
let us know about stuff like this, but no.  Hopefully, someday soon,
they will soon not be allowed to do this anymore.

{sigh}

Now queued up, thanks.

greg k-h
diff mbox series

Patch

diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 07427302084955..ecb3b397bb3888 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -2563,12 +2563,11 @@  EXPORT_SYMBOL_GPL(vhost_disable_notify);
 /* Create a new message. */
 struct vhost_msg_node *vhost_new_msg(struct vhost_virtqueue *vq, int type)
 {
-	struct vhost_msg_node *node = kmalloc(sizeof *node, GFP_KERNEL);
+	/* Make sure all padding within the structure is initialized. */
+	struct vhost_msg_node *node = kzalloc(sizeof(*node), GFP_KERNEL);
 	if (!node)
 		return NULL;
 
-	/* Make sure all padding within the structure is initialized. */
-	memset(&node->msg, 0, sizeof node->msg);
 	node->vq = vq;
 	node->msg.type = type;
 	return node;