linux-kernel - [PATCH 20/27] drivers/s390/net: Use memdup

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Date:	Sat, 22 May 2010 10:24:47 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Ursula Braun <ursula.braun@...ibm.com>,
	Frank Blaschka <blaschka@...ux.vnet.ibm.com>,
	linux390@...ibm.com, Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH 20/27] drivers/s390/net: Use memdup_user

From: Julia Lawall <julia@...u.dk>

Use memdup_user when user data is immediately copied into the
allocated region.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression from,to,size,flag;
position p;
identifier l1,l2;
@@

-  to = \(kmalloc@p\|kzalloc@p\)(size,flag);
+  to = memdup_user(from,size);
   if (
-      to==NULL
+      IS_ERR(to)
                 || ...) {
   <+... when != goto l1;
-  -ENOMEM
+  PTR_ERR(to)
   ...+>
   }
-  if (copy_from_user(to, from, size) != 0) {
-    <+... when != goto l2;
-    -EFAULT
-    ...+>
-  }
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---
 drivers/s390/net/qeth_core_main.c |   11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 13ef46b..8b48fbd 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -3764,15 +3764,10 @@ 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;
-	ureq = kmalloc(req_len+sizeof(struct qeth_snmp_ureq_hdr), GFP_KERNEL);
-	if (!ureq) {
+	ureq = memdup_user(udata, req_len + sizeof(struct qeth_snmp_ureq_hdr));
+	if (IS_ERR(ureq)) {
 		QETH_DBF_TEXT(TRACE, 2, "snmpnome");
-		return -ENOMEM;
-	}
-	if (copy_from_user(ureq, udata,
-			req_len + sizeof(struct qeth_snmp_ureq_hdr))) {
-		kfree(ureq);
-		return -EFAULT;
+		return PTR_ERR(ureq);
 	}
 	qinfo.udata_len = ureq->hdr.data_len;
 	qinfo.udata = kzalloc(qinfo.udata_len, GFP_KERNEL);
--
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