ipmi: fix oob access due to uninit smi_msg type

We're hitting OOB accesses in handle_ipmb_direct_rcv_rsp() (memcpy of
size -1) after user space generates a message. Looks like the message
is incorrectly assumed to be of the new IPMB type, because type is never
set and message is allocated with kmalloc() not kzalloc().

Fixes: 059747c ("ipmi: Add support for IPMB direct messages")
Signed-off-by: Jakub Kicinski <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Corey Minyard <[email protected]>

Author: kuba-moo

drivers/char/ipmi/ipmi_msghandler.c

@@ -5033,6 +5033,7 @@ struct ipmi_smi_msg *ipmi_alloc_smi_msg(void)
 	if (rv) {
 		rv->done = free_smi_msg;
 		rv->user_data = NULL;
+		rv->type = IPMI_SMI_MSG_TYPE_NORMAL;
 		atomic_inc(&smi_msg_inuse_count);
 	}
 	return rv;