gpio: don't free unallocated ida on gpiochip_add_data_with_key() error path

commit a05a14049999598a3bb6fab12db6b768a0215522 upstream.

The change corrects the error path in gpiochip_add_data_with_key()
by avoiding to call ida_simple_remove(), if ida_simple_get() returns
an error.

Note that ida_simple_remove()/ida_free() throws a BUG(), if id argument
is negative, it allows to easily check the correctness of the fix by
fuzzing the return value from ida_simple_get().

Fixes: ff2b13592299 ("gpio: make the gpiochip a real device")
Cc: stable@vger.kernel.org # v4.6+
Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 2518740..a8e01d9 100644 (file)
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1285,7 +1285,7 @@ int gpiochip_add_data_with_key(struct gpio_chip *chip, void *data,
        gdev->descs = kcalloc(chip->ngpio, sizeof(gdev->descs[0]), GFP_KERNEL);
        if (!gdev->descs) {
                status = -ENOMEM;
-               goto err_free_gdev;
+               goto err_free_ida;
        }
 
        if (chip->ngpio == 0) {
@@ -1413,8 +1413,9 @@ err_free_label:
        kfree_const(gdev->label);
 err_free_descs:
        kfree(gdev->descs);
-err_free_gdev:
+err_free_ida:
        ida_simple_remove(&gpio_ida, gdev->id);
+err_free_gdev:
        /* failures here can mean systems won't boot... */
        pr_err("%s: GPIOs %d..%d (%s) failed to register, %d\n", __func__,
               gdev->base, gdev->base + gdev->ngpio - 1,