In __clk_init(), after a clock is mostly initialized, a scan is done
of the orphan clocks to see if the clock being registered is the
parent of any of them.
This code assumes that any clock that provides a get_parent method
actually has at least one parent, and that's not a valid assumption.
As a result, an orphan clock with no parent can return *something*
as the parent index, and that value is blindly used to dereference
the orphan's parent_names[] array (which will be ZERO_SIZE_PTR or
NULL).
Fix this by ensuring get_parent is only called for orphans with at
least one parent.
Signed-off-by: Alex Elder <el...@linaro.org>
---
drivers/clk/clk.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 54a191c..ea8ff15 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -1628,7 +1628,7 @@ int __clk_init(struct device *dev, struct clk *clk)
* this clock
*/
hlist_for_each_entry_safe(orphan, tmp2, &clk_orphan_list, child_node) {
- if (orphan->ops->get_parent) {
+ if (orphan->num_parents && orphan->ops->get_parent) {
i = orphan->ops->get_parent(orphan->hw);
if (!strcmp(clk->name, orphan->parent_names[i]))
__clk_reparent(orphan, clk);
--
1.7.9.5
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