component: fix bug with legacy API



Sachin Kamat reports that "component: add support for component match
array" broke Exynos DRM due to a NULL pointer deref.  Fix this.

Reported-by: Sachin Kamat <sachin.kamat@samsung.com>
Tested-by: Sachin Kamat <sachin.kamat@samsung.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

parent 6955b582

drivers/base/component.c

+6 −4

Original line number	Diff line number	Diff line
		@@ -293,10 +293,12 @@ int component_master_add_with_match(struct device *dev,
		if (ops->add_components && match)
		return -EINVAL;

		if (match) {
		/* Reallocate the match array for its true size */
		match = component_match_realloc(dev, match, match->num);
		if (IS_ERR(match))
		return PTR_ERR(match);
		}

		master = kzalloc(sizeof(*master), GFP_KERNEL);
		if (!master)