net: irda: using kzalloc() instead of kmalloc() to avoid strncpy() issue.

'discovery->data.info' length is 22, NICKNAME_MAX_LEN is 21, so the
strncpy() will always left the last byte of 'discovery->data.info'
uninitialized.

When 'text' length is longer than 21 (NICKNAME_MAX_LEN), if still left
the last byte of 'discovery->data.info' uninitialized, the next
strlen() will cause issue.

Also 'discovery->data' is 'struct irda_device_info' which defined in
"include/uapi/...", it may copy to user mode, so need whole initialized.

All together, need use kzalloc() instead of kmalloc() to initialize all
members firstly.

Signed-off-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/irda/irlap_frame.c b/net/irda/irlap_frame.c
index 8c004161a843a2e33a963ddd254c4a0e5a129969..9ea0c933b9ff8803c071367bfef0df210090a90f 100644 (file)
--- a/net/irda/irlap_frame.c
+++ b/net/irda/irlap_frame.c
@@ -544,7 +544,7 @@ static void irlap_recv_discovery_xid_cmd(struct irlap_cb *self,
                /*
                 *  We now have some discovery info to deliver!
                 */
-               discovery = kmalloc(sizeof(discovery_t), GFP_ATOMIC);
+               discovery = kzalloc(sizeof(discovery_t), GFP_ATOMIC);
                if (!discovery) {
                        IRDA_WARNING("%s: unable to malloc!\n", __func__);
                        return;