From: Julia Lawall <[email protected]>
Error handling code following a kzalloc should free the allocated data.
The semantic match that finds this 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 <[email protected]>
---
drivers/rtc/rtc-mxc.c | 6 ++++--
1 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/rtc/rtc-mxc.c b/drivers/rtc/rtc-mxc.c
index 6bd5072..2642e6b 100644
--- a/drivers/rtc/rtc-mxc.c
+++ b/drivers/rtc/rtc-mxc.c
@@ -396,8 +396,10 @@ static int __init mxc_rtc_probe(struct platform_device *pdev)
pdata->ioaddr = ioremap(res->start, resource_size(res));
clk = clk_get(&pdev->dev, "ckil");
- if (IS_ERR(clk))
- return PTR_ERR(clk);
+ if (IS_ERR(clk)) {
+ ret = PTR_ERR(clk);
+ goto exit_free_pdata;
+ }
rate = clk_get_rate(clk);
clk_put(clk);
On Sat, 21 Nov 2009 12:50:08 +0100 (CET)
Julia Lawall <[email protected]> wrote:
> Signed-off-by: Julia Lawall <[email protected]>
Acked-by: Alessandro Zummo <[email protected]>
--
Best regards,
Alessandro Zummo,
Tower Technologies - Torino, Italy
http://www.towertech.it