linux-kernel - [PATCH 6/10] drivers/net/wireless/iwlwifi: introduce missing kfree

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Message-ID: <Pine.LNX.4.64.0908011054010.23408@ask.diku.dk>
Date:	Sat, 1 Aug 2009 10:54:21 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	yi.zhu@...el.com, reinette.chatre@...el.com,
	linux-wireless@...r.kernel.org,
	ipw3945-devel@...ts.sourceforge.net, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 6/10] drivers/net/wireless/iwlwifi: introduce missing kfree

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

Error handling code following a kzalloc should free the allocated data.

The semantic match that finds the problem is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@r exists@
local idexpression x;
statement S;
expression E;
identifier f,f1,l;
position p1,p2;
expression *ptr != NULL;
@@

x@p1 = \(kmalloc\|kzalloc\|kcalloc\)(...);
...
if (x == NULL) S
<... when != x
     when != if (...) { <+...x...+> }
(
x->f1 = E
|
 (x->f1 == NULL || ...)
|
 f(...,x->f1,...)
)
...>
(
 return \(0\|<+...x...+>\|ptr\);
|
 return@p2 ...;
)

@script:python@
p1 << r.p1;
p2 << r.p2;
@@

print "* file: %s kmalloc %s return %s" % (p1[0].file,p1[0].line,p2[0].line)
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>
---
 drivers/net/wireless/iwlwifi/iwl-debugfs.c     |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/net/wireless/iwlwifi/iwl-debugfs.c b/drivers/net/wireless/iwlwifi/iwl-debugfs.c
index 7707a26..c2106d0 100644
--- a/drivers/net/wireless/iwlwifi/iwl-debugfs.c
+++ b/drivers/net/wireless/iwlwifi/iwl-debugfs.c
@@ -320,6 +320,7 @@ static ssize_t iwl_dbgfs_nvm_read(struct file *file,
 	ptr = priv->eeprom;
 	if (!ptr) {
 		IWL_ERR(priv, "Invalid EEPROM/OTP memory\n");
+		kfree(buf);
 		return -ENOMEM;
 	}
 	pos += scnprintf(buf + pos, buf_size - pos, "NVM Type: %s\n",
--
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