mfd: vexpress: fix error handling vexpress_syscfg_regmap_init()
authorDan Carpenter <dan.carpenter@oracle.com>
Wed, 11 Jun 2014 10:17:41 +0000 (13:17 +0300)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 10 Jul 2014 00:00:45 +0000 (17:00 -0700)
This function should be returning an ERR_PTR() on failure instead of
NULL.  Also there is a use after free bug if regmap_init() fails because
we free "func" and then dereference doing the return.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Pawel Moll <pawel.moll@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/misc/vexpress-syscfg.c

index 73068e50e56d223716a886aacb2ce173de520752..3250fc1df0aa35416d5dad4d59e90003ad224169 100644 (file)
@@ -199,7 +199,7 @@ static struct regmap *vexpress_syscfg_regmap_init(struct device *dev,
        func = kzalloc(sizeof(*func) + sizeof(*func->template) * num,
                        GFP_KERNEL);
        if (!func)
-               return NULL;
+               return ERR_PTR(-ENOMEM);
 
        func->syscfg = syscfg;
        func->num_templates = num;
@@ -231,10 +231,14 @@ static struct regmap *vexpress_syscfg_regmap_init(struct device *dev,
        func->regmap = regmap_init(dev, NULL, func,
                        &vexpress_syscfg_regmap_config);
 
-       if (IS_ERR(func->regmap))
+       if (IS_ERR(func->regmap)) {
+               void *err = func->regmap;
+
                kfree(func);
-       else
-               list_add(&func->list, &syscfg->funcs);
+               return err;
+       }
+
+       list_add(&func->list, &syscfg->funcs);
 
        return func->regmap;
 }