netdev - [PATCH] ipx: call ipxitf_put() in ioctl error path

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Message-ID: <20170502105853.yz3ny6lyso6isdvx@mwanda>
Date:   Tue, 2 May 2017 13:58:53 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org,
        "security@...nel.org" <security@...nel.org>,
        "secalert@...hat.com" <secalert@...hat.com>
Subject: [PATCH] ipx: call ipxitf_put() in ioctl error path

We should call ipxitf_put() if the copy_to_user() fails.

Reported-by: 李强 <liqiang6-s@....cn>
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/net/ipx/af_ipx.c b/net/ipx/af_ipx.c
index 8a9219ff2e77..fa31ef29e3fa 100644
--- a/net/ipx/af_ipx.c
+++ b/net/ipx/af_ipx.c
@@ -1168,11 +1168,10 @@ static int ipxitf_ioctl(unsigned int cmd, void __user *arg)
 		sipx->sipx_network	= ipxif->if_netnum;
 		memcpy(sipx->sipx_node, ipxif->if_node,
 			sizeof(sipx->sipx_node));
-		rc = -EFAULT;
+		rc = 0;
 		if (copy_to_user(arg, &ifr, sizeof(ifr)))
-			break;
+			rc = -EFAULT;
 		ipxitf_put(ipxif);
-		rc = 0;
 		break;
 	}
 	case SIOCAIPXITFCRT: