linux-kernel - [patch] VMCI: integer overflow in vmci_datagram

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Message-ID: <20140829084256.GA14780@mwanda>
Date:	Fri, 29 Aug 2014 11:42:56 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	linux-kernel@...r.kernel.org,
	George Zhang <georgezhang@...are.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	kernel-janitors@...r.kernel.org
Subject: [patch] VMCI: integer overflow in vmci_datagram_dispatch()

This is untrusted user data from vmci_host_do_send_datagram() so the
VMCI_DG_SIZE() macro can have an integer overflow.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/drivers/misc/vmw_vmci/vmci_datagram.c b/drivers/misc/vmw_vmci/vmci_datagram.c
index f3cdd90..8226652 100644
--- a/drivers/misc/vmw_vmci/vmci_datagram.c
+++ b/drivers/misc/vmw_vmci/vmci_datagram.c
@@ -328,7 +328,8 @@ int vmci_datagram_dispatch(u32 context_id,
 
 	BUILD_BUG_ON(sizeof(struct vmci_datagram) != 24);
 
-	if (VMCI_DG_SIZE(dg) > VMCI_MAX_DG_SIZE) {
+	if (dg->payload_size > VMCI_MAX_DG_SIZE ||
+	    VMCI_DG_SIZE(dg) > VMCI_MAX_DG_SIZE) {
 		pr_devel("Payload (size=%llu bytes) too big to send\n",
 			 (unsigned long long)dg->payload_size);
 		return VMCI_ERROR_INVALID_ARGS;
--
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