xen: xenbus_dev_frontend: Really return response string

xenbus_command_reply() did not actually copy the response string and
leaked stack content instead.

Fixes: 9a6161fe73bd ("xen: return xenstore command failures via response instead of rc")
Signed-off-by: Simon Gaiser <simon@invisiblethingslab.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/xen/xenbus/xenbus_dev_frontend.c b/drivers/xen/xenbus/xenbus_dev_frontend.c
index 0d6d9264d6a9..c3e201025ef0 100644
--- a/drivers/xen/xenbus/xenbus_dev_frontend.c
+++ b/drivers/xen/xenbus/xenbus_dev_frontend.c
@@ -403,7 +403,7 @@ static int xenbus_command_reply(struct xenbus_file_priv *u,
 {
         struct {
                 struct xsd_sockmsg hdr;
-                const char body[16];
+                char body[16];
         } msg;
         int rc;
 
@@ -412,6 +412,7 @@ static int xenbus_command_reply(struct xenbus_file_priv *u,
         msg.hdr.len = strlen(reply) + 1;
         if (msg.hdr.len > sizeof(msg.body))
                 return -E2BIG;
+        memcpy(&msg.body, reply, msg.hdr.len);
 
         mutex_lock(&u->reply_mutex);
         rc = queue_reply(&u->read_buffers, &msg, sizeof(msg.hdr) + msg.hdr.len);