From: Julia Lawall <julia@diku.dk>
Date: Thu, 25 Dec 2008 20:09:57 +0000 (+0100)
Subject: Staging: go7007: introduce missing kfree
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=253d3b139a5aa1a27672eab96879c7e019bdb774;p=openwrt%2Fstaging%2Fblogic.git

Staging: go7007: introduce missing kfree

Error handling code following a kmalloc 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,l;
position p1,p2;
expression *ptr != NULL;
@@

(
if ((x@p1 = \(kmalloc\|kzalloc\|kcalloc\)(...)) == NULL) S
|
x@p1 = \(kmalloc\|kzalloc\|kcalloc\)(...);
...
if (x == NULL) S
)
<... when != x
     when != if (...) { <+...x...+> }
x->f = E
...>
(
 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@diku.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/staging/go7007/s2250-board.c b/drivers/staging/go7007/s2250-board.c
index a60e19ce794f..d333ea2cd774 100644
--- a/drivers/staging/go7007/s2250-board.c
+++ b/drivers/staging/go7007/s2250-board.c
@@ -167,6 +167,7 @@ static int write_reg(struct i2c_client *client, u8 reg, u8 value)
 	usb = go->hpi_context;
 	if (down_interruptible(&usb->i2c_lock) != 0) {
 		printk(KERN_INFO "i2c lock failed\n");
+		kfree(buf);
 		return -EINTR;
 	}
 	rc = go7007_usb_vendor_request(go, 0x55, dev_addr,