[PATCH 5/5] sound/aoa: Add kmalloc NULL tests
Julia Lawall
julia at diku.dk
Fri Jul 31 16:32:03 EST 2009
From: Julia Lawall <julia at diku.dk>
Check that the result of kzalloc is not NULL before a dereference.
The semantic match that finds this problem is as follows:
(http://www.emn.fr/x-info/coccinelle/)
// <smpl>
@@
expression *x;
identifier f;
constant char *C;
@@
x = \(kmalloc\|kcalloc\|kzalloc\)(...);
... when != x == NULL
when != x != NULL
when != (x || ...)
(
kfree(x)
|
f(...,C,...,x,...)
|
*f(...,x,...)
|
*x->f
)
// </smpl>
Signed-off-by: Julia Lawall <julia at diku.dk>
---
sound/aoa/core/gpio-pmf.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/var/linuxes/linux-next/sound/aoa/core/gpio-pmf.c b/var/julia/linuxcopy/sound/aoa/core/gpio-pmf.c
index 5ca2220..1dd0c28 100644
--- a/var/linuxes/linux-next/sound/aoa/core/gpio-pmf.c
+++ b/var/julia/linuxcopy/sound/aoa/core/gpio-pmf.c
@@ -182,6 +182,10 @@ static int pmf_set_notify(struct gpio_runtime *rt,
if (!old && notify) {
irq_client = kzalloc(sizeof(struct pmf_irq_client),
GFP_KERNEL);
+ if (!irq_client) {
+ err = -ENOMEM;
+ goto out_unlock;
+ }
irq_client->data = notif;
irq_client->handler = pmf_handle_notify_irq;
irq_client->owner = THIS_MODULE;
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