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: 059747c245f0 ("ipmi: Add support for IPMB direct messages")
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Message-Id: <20211124210323.1950976-1-kuba@kernel.org>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_msghandler.c
index a2ec017..7d7df17 100644
--- a/drivers/char/ipmi/ipmi_msghandler.c
+++ b/drivers/char/ipmi/ipmi_msghandler.c
@@ -5033,6 +5033,7 @@
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;
