drivers/net/wireless/p54/eeprom.c: Return -ENOMEM on memory allocation failure

commit 0d91f22b75347d9503b17a42b6c74d3f7750acd6 upstream.

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@diku.dk>
Acked-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

diff --git a/drivers/net/wireless/p54/eeprom.c b/drivers/net/wireless/p54/eeprom.c
index 187e263b045ae813dae3fb59a7c0b27b9d85c4fe..53d0f201c942c0362db0f2311aa16d2c5c96edf0 100644 (file)
--- a/drivers/net/wireless/p54/eeprom.c
+++ b/drivers/net/wireless/p54/eeprom.c
@@ -262,8 +262,10 @@ static int p54_generate_channel_lists(struct ieee80211_hw *dev)
        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) {