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driver core: platform: Prevent resouce overflow from causing infinite loops 

[ Upstream commit 39cc539f90 ]

num_resources in the platform_device struct is declared as a u32.  The
for loops that iterate over num_resources use an int as the counter,
which can cause infinite loops on architectures with smaller ints.
Change the loop counters to u32.

Signed-off-by: Simon Schwartz <kern.simon@theschwartz.xyz>
Link: https://lore.kernel.org/r/2201ce63a2a171ffd2ed14e867875316efcf71db.camel@theschwartz.xyz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Simon Schwartz 2019-12-10 17:41:37 -05:00 committed by Greg Kroah-Hartman
parent 11c759264c
commit 3f6af05d1d
1 changed files with 6 additions and 4 deletions
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10
drivers/base/platform.c
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@ -27,6 +27,7 @@
#include <linux/limits.h>
#include <linux/property.h>
#include <linux/kmemleak.h>
#include <linux/types.h>
#include "base.h"
#include "power/power.h"
@ -48,7 +49,7 @@ EXPORT_SYMBOL_GPL(platform_bus);
struct resource *platform_get_resource(struct platform_device *dev,
unsigned int type, unsigned int num)
{
int i;
u32 i;
for (i = 0; i < dev->num_resources; i++) {
struct resource *r = &dev->resource[i];
@ -226,7 +227,7 @@ struct resource *platform_get_resource_byname(struct platform_device *dev,
unsigned int type,
const char *name)
{
int i;
u32 i;
for (i = 0; i < dev->num_resources; i++) {
struct resource *r = &dev->resource[i];
@ -473,7 +474,8 @@ EXPORT_SYMBOL_GPL(platform_device_add_properties);
*/
int platform_device_add(struct platform_device *pdev)
{
int i, ret;
u32 i;
int ret;
if (!pdev)
return -EINVAL;
@ -562,7 +564,7 @@ EXPORT_SYMBOL_GPL(platform_device_add);
*/
void platform_device_del(struct platform_device *pdev)
{
int i;
u32 i;
if (!IS_ERR_OR_NULL(pdev)) {
device_del(&pdev->dev);