[3.8.y.z extended stable] Patch "qeth: avoid buffer overflow in snmp ioctl" has been added to staging queue

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    qeth: avoid buffer overflow in snmp ioctl

to the linux-3.8.y-queue branch of the 3.8.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.8.y-queue

This patch is scheduled to be released in version 3.8.13.14.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.8.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From 80c5fa2c5c95288420b40a99f0ae1895bc2d54f4 Mon Sep 17 00:00:00 2001
From: Ursula Braun <ursula.braun at de.ibm.com>
Date: Wed, 6 Nov 2013 09:04:52 +0100
Subject: qeth: avoid buffer overflow in snmp ioctl

commit 6fb392b1a63ae36c31f62bc3fc8630b49d602b62 upstream.

Check user-defined length in snmp ioctl request and allow request
only if it fits into a qeth command buffer.

Signed-off-by: Ursula Braun <ursula.braun at de.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka at de.ibm.com>
Reviewed-by: Heiko Carstens <heicars2 at linux.vnet.ibm.com>
Reported-by: Nico Golde <nico at ngolde.de>
Reported-by: Fabian Yamaguchi <fabs at goesec.de>
Signed-off-by: David S. Miller <davem at davemloft.net>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 drivers/s390/net/qeth_core_main.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 638a57f..98b60fd 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -4368,7 +4368,7 @@ int qeth_snmp_command(struct qeth_card *card, char __user *udata)
 	struct qeth_cmd_buffer *iob;
 	struct qeth_ipa_cmd *cmd;
 	struct qeth_snmp_ureq *ureq;
-	int req_len;
+	unsigned int req_len;
 	struct qeth_arp_query_info qinfo = {0, };
 	int rc = 0;

@@ -4384,6 +4384,10 @@ int qeth_snmp_command(struct qeth_card *card, char __user *udata)
 	/* skip 4 bytes (data_len struct member) to get req_len */
 	if (copy_from_user(&req_len, udata + sizeof(int), sizeof(int)))
 		return -EFAULT;
+	if (req_len > (QETH_BUFSIZE - IPA_PDU_HEADER_SIZE -
+		       sizeof(struct qeth_ipacmd_hdr) -
+		       sizeof(struct qeth_ipacmd_setadpparms_hdr)))
+		return -EINVAL;
 	ureq = memdup_user(udata, req_len + sizeof(struct qeth_snmp_ureq_hdr));
 	if (IS_ERR(ureq)) {
 		QETH_CARD_TEXT(card, 2, "snmpnome");
--
1.8.3.2