watchdog: cpwd: Fix buffer-overflow

cppcheck-1.47 reports:
[drivers/watchdog/cpwd.c:650]: (error) Buffer access out-of-bounds: p.devs

The source code is
	for (i = 0; i < 4; i++) {
		misc_deregister(&p->devs[i].misc);

where devs is defined as WD_NUMDEVS big and WD_NUMDEVS is equal to 3.
So the 4 should be a 3 or WD_NUMDEVS.

Reported-By: David Binderman
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

diff --git a/drivers/watchdog/cpwd.c b/drivers/watchdog/cpwd.c
index eca855a..3de4ba0 100644 (file)
--- a/drivers/watchdog/cpwd.c
+++ b/drivers/watchdog/cpwd.c
@@ -646,7 +646,7 @@ static int __devexit cpwd_remove(struct platform_device *op)
        struct cpwd *p = dev_get_drvdata(&op->dev);
        int i;
 
-       for (i = 0; i < 4; i++) {
+       for (i = 0; i < WD_NUMDEVS; i++) {
                misc_deregister(&p->devs[i].misc);
 
                if (!p->enabled) {