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base/platform: Safe handling for NULL platform data and resources

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Some users of platform_device_add_{data,resources}() assume that
NULL data and resources will be handled specially, i.e. just ignored.

But the platform core ends up calling kmemdup(NULL, 0, ...), which
returns a non-NULL result (i.e. ZERO_SIZE_PTR), which causes drivers
to oops on a valid code, something like:

  if (platform_data)
  	stuff = platform_data->stuff;

This patch makes the platform core a bit more safe for such cases.

Signed-off-by: Anton Vorontsov <cbouatmailru@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Anton Vorontsov 2010-09-07 17:31:49 +04:00 committed by Greg Kroah-Hartman
parent 87544653ab
commit 5cfc64ceb6
1 changed files with 8 additions and 1 deletions
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9
drivers/base/platform.c
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@ -192,6 +192,9 @@ int platform_device_add_resources(struct platform_device *pdev,
{
struct resource *r;
if (!res)
return 0;
r = kmemdup(res, sizeof(struct resource) * num, GFP_KERNEL);
if (r) {
pdev->resource = r;
@ -215,8 +218,12 @@ EXPORT_SYMBOL_GPL(platform_device_add_resources);
int platform_device_add_data(struct platform_device *pdev, const void *data,
size_t size)
{
void *d = kmemdup(data, size, GFP_KERNEL);
void *d;
if (!data)
return 0;
d = kmemdup(data, size, GFP_KERNEL);
if (d) {
pdev->dev.platform_data = d;
return 0;