clk: fix possible null pointer dereference

The commit 646cafc6 (clk: Change clk_ops->determine_rate to return a clk_hw as the best parent) opens a possibility for null pointer dereference, fix this. Signed-off-by: Stanimir Varbanov <svarbanov@mm-sol.com> Reviewed-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Michael Turquette <mturquette@linaro.org>

clk: fix possible null pointer dereference
The commit 646cafc6 (clk: Change clk_ops->determine_rate to return a clk_hw as the best parent) opens a possibility for null pointer dereference, fix this. Signed-off-by: Stanimir Varbanov <svarbanov@mm-sol.com> Reviewed-by: Stephen Boyd <sboyd@codeaurora.org> Signed-off-by: Michael Turquette <mturquette@linaro.org>
Stanimir Varbanov · Michael Turquette
1 parent 176a107b86
Showing 1 changed file with 1 additions and 1 deletions Side-by-side Diff
drivers/clk/clk.c
@@ -1366,7 +1366,7 @@
 		new_rate = clk->ops->determine_rate(clk->hw, rate,
 						    &best_parent_rate,
 						    &parent_hw);
-		parent = parent_hw->clk;
+		parent = parent_hw ? parent_hw->clk : NULL;
 	} else if (clk->ops->round_rate) {
 		new_rate = clk->ops->round_rate(clk->hw, rate,
 						&best_parent_rate);
...	...	@@ -1366,7 +1366,7 @@
1366	1366	new_rate = clk->ops->determine_rate(clk->hw, rate,
1367	1367	&best_parent_rate,
1368	1368	&parent_hw);
1369		- parent = parent_hw->clk;
	1369	+ parent = parent_hw ? parent_hw->clk : NULL;
1370	1370	} else if (clk->ops->round_rate) {
1371	1371	new_rate = clk->ops->round_rate(clk->hw, rate,
1372	1372	&best_parent_rate);