From 5cfc64ceb6222aabec640ba76e89529a8fc2c1f0 Mon Sep 17 00:00:00 2001 From: Anton Vorontsov Date: Tue, 7 Sep 2010 17:31:49 +0400 Subject: 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 Signed-off-by: Greg Kroah-Hartman --- drivers/base/platform.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/base/platform.c b/drivers/base/platform.c index a01abf9..c794fec 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; -- cgit v1.1