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From: Julia Lawall on 1 Jun 2010 10:40
From: Julia Lawall <julia(a)diku.dk>

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,f1,l;
position p1,p2;
expression *ptr != NULL;
@@

x(a)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(a)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(a)diku.dk>
---
drivers/hid/hid-roccat.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/hid/hid-roccat.c b/drivers/hid/hid-roccat.c
index e05d48e..f6e80c7 100644
--- a/drivers/hid/hid-roccat.c
+++ b/drivers/hid/hid-roccat.c
@@ -168,7 +168,7 @@ static int roccat_open(struct inode *inode, struct file *file)
printk(KERN_EMERG "roccat device with minor %d doesn't exist\n",
minor);
error = -ENODEV;
- goto exit_unlock;
+ goto exit_err;
}

if (!device->open++) {
@@ -178,7 +178,7 @@ static int roccat_open(struct inode *inode, struct file *file)
PM_HINT_FULLON);
if (error < 0) {
--device->open;
- goto exit_unlock;
+ goto exit_err;
}
}
error = device->hid->ll_driver->open(device->hid);
@@ -187,7 +187,7 @@ static int roccat_open(struct inode *inode, struct file *file)
device->hid->ll_driver->power(device->hid,
PM_HINT_NORMAL);
--device->open;
- goto exit_unlock;
+ goto exit_err;
}
}

@@ -202,6 +202,9 @@ exit_unlock:
mutex_unlock(&device->readers_lock);
mutex_unlock(&devices_lock);
return error;
+exit_err:
+ kfree(reader);
+ goto exit_unlock;
}

static int roccat_release(struct inode *inode, struct file *file)
--
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