drivers/rtc: introduce missing kfree
Author: Julia Lawall <julia@diku.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/)
//
@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)
//
Signed-off-by: Julia Lawall
Cc: David Brownell
Cc: Alessandro Zummo
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
---
drivers/rtc/rtc-ep93xx.c | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)
diff --git a/drivers/rtc/rtc-ep93xx.c b/drivers/rtc/rtc-ep93xx.c
index 551332e..9da02d1 100644
--- 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;
} |
---
drivers/rtc/rtc-ep93xx.c | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)
diff --git a/drivers/rtc/rtc-ep93xx.c b/drivers/rtc/rtc-ep93xx.c
index 551332e..9da02d1 100644
--- 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;
}