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xen: xenbus_dev_frontend: Really return response string 

[ Upstream commit ebf04f331f ]

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

Fixes: 9a6161fe73 ("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>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Simon Gaiser 2018-03-15 04:08:03 +01:00 committed by Greg Kroah-Hartman
parent d5cf1ed8d3
commit ff3080bab1
1 changed files with 2 additions and 1 deletions
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3
drivers/xen/xenbus/xenbus_dev_frontend.c
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@ -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);