linux-kernel - [PATCH] ipmi: fix oob access due to uninit smi

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Message-Id: <20211124210323.1950976-1-kuba@kernel.org>
Date:   Wed, 24 Nov 2021 13:03:23 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     minyard@....org, andrew.manley@...lingtech.com
Cc:     openipmi-developer@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, kernel-team@...com,
        Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH] 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@...nel.org>
---
Would it be possible to get something like this to Linus ASAP?
It's flipping over all my test boxes.
---
 drivers/char/ipmi/ipmi_msghandler.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_msghandler.c
index deed355422f4..f0b18c25cbb1 100644
--- a/drivers/char/ipmi/ipmi_msghandler.c
+++ b/drivers/char/ipmi/ipmi_msghandler.c
@@ -5031,6 +5031,7 @@ 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;
-- 
2.31.1