linux-kernel - [PATCH 3/7] drivers/net/wireless/p54/eeprom.c: Return -ENOMEM on memory allocation failure

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Date:	Fri, 15 Oct 2010 15:00:06 +0200
From:	Julia Lawall <julia@...u.dk>
To:	Christian Lamparter <chunkeey@...glemail.com>
Cc:	kernel-janitors@...r.kernel.org,
	"John W. Linville" <linville@...driver.com>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 3/7] drivers/net/wireless/p54/eeprom.c: Return -ENOMEM on memory allocation failure

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

In this code, 0 is returned on memory allocation failure, even though other
failures return -ENOMEM or other similar values.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression ret;
expression x,e1,e2,e3;
@@

ret = 0
... when != ret = e1
*x = \(kmalloc\|kcalloc\|kzalloc\)(...)
... when != ret = e2
if (x == NULL) { ... when != ret = e3
  return ret;
}
// </smpl>

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

---
 drivers/net/wireless/p54/eeprom.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff -u -p a/drivers/net/wireless/p54/eeprom.c b/drivers/net/wireless/p54/eeprom.c
--- a/drivers/net/wireless/p54/eeprom.c
+++ b/drivers/net/wireless/p54/eeprom.c
@@ -261,8 +261,10 @@ static int p54_generate_channel_lists(st
 	list->max_entries = max_channel_num;
 	list->channels = kzalloc(sizeof(struct p54_channel_entry) *
 				 max_channel_num, GFP_KERNEL);
-	if (!list->channels)
+	if (!list->channels) {
+		ret = -ENOMEM;
 		goto free;
+	}
 
 	for (i = 0; i < max_channel_num; i++) {
 		if (i < priv->iq_autocal_len) {

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