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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Wenwen Wang <wang6495@umn.edu>,
        "David S. Miller" <davem@davemloft.net>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.18 069/150] yam: fix a missing-check bug
Date:   Fri,  2 Nov 2018 19:33:51 +0100
Message-Id: <20181102182908.415893703@linuxfoundation.org>
In-Reply-To: <20181102182902.250560510@linuxfoundation.org>
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4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit 0781168e23a2fc8dceb989f11fc5b39b3ccacc35 ]

In yam_ioctl(), the concrete ioctl command is firstly copied from the
user-space buffer 'ifr->ifr_data' to 'ioctl_cmd' and checked through the
following switch statement. If the command is not as expected, an error
code EINVAL is returned. In the following execution the buffer
'ifr->ifr_data' is copied again in the cases of the switch statement to
specific data structures according to what kind of ioctl command is
requested. However, after the second copy, no re-check is enforced on the
newly-copied command. Given that the buffer 'ifr->ifr_data' is in the user
space, a malicious user can race to change the command between the two
copies. This way, the attacker can inject inconsistent data and cause
undefined behavior.

This patch adds a re-check in each case of the switch statement if there is
a second copy in that case, to re-check whether the command obtained in the
second copy is the same as the one in the first copy. If not, an error code
EINVAL will be returned.

Signed-off-by: Wenwen Wang <wang6495@umn.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/hamradio/yam.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/hamradio/yam.c b/drivers/net/hamradio/yam.c
index 16ec7af6ab7b..ba9df430fca6 100644
--- a/drivers/net/hamradio/yam.c
+++ b/drivers/net/hamradio/yam.c
@@ -966,6 +966,8 @@ static int yam_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 				 sizeof(struct yamdrv_ioctl_mcs));
 		if (IS_ERR(ym))
 			return PTR_ERR(ym);
+		if (ym->cmd != SIOCYAMSMCS)
+			return -EINVAL;
 		if (ym->bitrate > YAM_MAXBITRATE) {
 			kfree(ym);
 			return -EINVAL;
@@ -981,6 +983,8 @@ static int yam_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 		if (copy_from_user(&yi, ifr->ifr_data, sizeof(struct yamdrv_ioctl_cfg)))
 			 return -EFAULT;
 
+		if (yi.cmd != SIOCYAMSCFG)
+			return -EINVAL;
 		if ((yi.cfg.mask & YAM_IOBASE) && netif_running(dev))
 			return -EINVAL;		/* Cannot change this parameter when up */
 		if ((yi.cfg.mask & YAM_IRQ) && netif_running(dev))
-- 
2.17.1