drivers/rtc: introduce missing kfree

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@diku.dk>
Cc: David Brownell <david-b@pacbell.net>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/rtc/rtc-ep93xx.c b/drivers/rtc/rtc-ep93xx.c
index 551332e4ed02a28122b72b817bf0682814ed13c2..9da02d108b73370d79f45dea06f016143b93ac90 100644 (file)
--- a/drivers/rtc/rtc-ep93xx.c
+++ b/drivers/rtc/rtc-ep93xx.c
@@ -128,12 +128,16 @@ static int __init ep93xx_rtc_probe(struct platform_device *pdev)
                return -ENOMEM;
 
        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-       if (res == NULL)
-               return -ENXIO;
+       if (res == NULL) {
+               err = -ENXIO;
+               goto fail_free;
+       }
 
        res = request_mem_region(res->start, resource_size(res), pdev->name);
-       if (res == NULL)
-               return -EBUSY;
+       if (res == NULL) {
+               err = -EBUSY;
+               goto fail_free;
+       }
 
        ep93xx_rtc->mmio_base = ioremap(res->start, resource_size(res));
        if (ep93xx_rtc->mmio_base == NULL) {
@@ -169,6 +173,8 @@ fail:
                pdev->dev.platform_data = NULL;
        }
        release_mem_region(res->start, resource_size(res));
+fail_free:
+       kfree(ep93xx_rtc);
        return err;
 }