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Subject[PATCH 5.4 05/46] driver core: platform: use the correct callback type for bus_find_device
Date
From: Sami Tolvanen <samitolvanen@google.com>

commit 492c88720d36eb662f9f10c1633f7726fbb07fc4 upstream.

platform_find_device_by_driver calls bus_find_device and passes
platform_match as the callback function. Casting the function to a
mismatching type trips indirect call Control-Flow Integrity (CFI) checking.

This change adds a callback function with the correct type and instead
of casting the function, explicitly casts the second parameter to struct
device_driver* as expected by platform_match.

Fixes: 36f3313d6bff9 ("platform: Add platform_find_device_by_driver() helper")
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20191112214156.3430-1-samitolvanen@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/base/platform.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -1278,6 +1278,11 @@ struct bus_type platform_bus_type = {
};
EXPORT_SYMBOL_GPL(platform_bus_type);

+static inline int __platform_match(struct device *dev, const void *drv)
+{
+ return platform_match(dev, (struct device_driver *)drv);
+}
+
/**
* platform_find_device_by_driver - Find a platform device with a given
* driver.
@@ -1288,7 +1293,7 @@ struct device *platform_find_device_by_d
const struct device_driver *drv)
{
return bus_find_device(&platform_bus_type, start, drv,
- (void *)platform_match);
+ __platform_match);
}
EXPORT_SYMBOL_GPL(platform_find_device_by_driver);


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