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authorAnton Vorontsov <cbouatmailru@gmail.com>2010-09-07 17:31:49 +0400
committerGreg Kroah-Hartman <gregkh@suse.de>2010-10-22 21:16:43 +0400
commit5cfc64ceb6222aabec640ba76e89529a8fc2c1f0 (patch)
treecb49e651fbb5ec4192ef650fd5b63c1dba0040f1 /drivers/base/platform.c
parent87544653abe4a03324bc85dae32d5bdaabcfccef (diff)
downloadlinux-5cfc64ceb6222aabec640ba76e89529a8fc2c1f0.tar.xz
base/platform: Safe handling for NULL platform data and resources
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>
Diffstat (limited to 'drivers/base/platform.c')
-rw-r--r--drivers/base/platform.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index a01abf9ebf7b..c794fec1c435 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -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;