[PATCH 4.4 203/312] clk: gpio: handle error codes for of_clk_get_parent_count()

[Greg Kroah-Hartman]

From: Brian Norris <computersforpe...@gmail.com>

commit 0b2e78865d92e2d70542cb1d4d7af1d4ea0a286d upstream.

We might make bad memory allocations if we get (e.g.) -ENOSYS from
of_clk_get_parent_count().

Noticed by Coverity.

Fixes: f66541ba02d5 ("clk: gpio: Get parent clk names in of_gpio_clk_setup()")
Signed-off-by: Brian Norris <computersforpe...@gmail.com>
Cc: Jyri Sarha <jsa...@ti.com>
Cc: Sergej Sawazki <c...@gmx.de>
Cc: Stephen Boyd <sb...@codeaurora.org>
Signed-off-by: Michael Turquette <mturque...@baylibre.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/clk/clk-gpio.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/clk/clk-gpio.c
+++ b/drivers/clk/clk-gpio.c
@@ -287,12 +287,14 @@ static void __init of_gpio_clk_setup(str
        const char **parent_names;
        int i, num_parents;
 
+       num_parents = of_clk_get_parent_count(node);
+       if (num_parents < 0)
+               return;
+
        data = kzalloc(sizeof(*data), GFP_KERNEL);
        if (!data)
                return;
 
-       num_parents = of_clk_get_parent_count(node);
-
        parent_names = kcalloc(num_parents, sizeof(char *), GFP_KERNEL);
        if (!parent_names)
                return;