mmc: meson-mx-sdio: check devm_kasprintf for failure

devm_kasprintf() may return NULL on failure of internal allocation thus
the assignments to  init.name  are not safe if not checked. On error
meson_mx_mmc_register_clks() returns negative values so -ENOMEM in the
(unlikely) failure case of devm_kasprintf() should be fine here.

Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
Fixes: ed80a13bb4c4 ("mmc: meson-mx-sdio: Add a driver for the Amlogic Meson8 and Meson8b SoCs")
Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/meson-mx-sdio.c b/drivers/mmc/host/meson-mx-sdio.c
index abe253c..ec980bd 100644 (file)
--- a/drivers/mmc/host/meson-mx-sdio.c
+++ b/drivers/mmc/host/meson-mx-sdio.c
@@ -596,6 +596,9 @@ static int meson_mx_mmc_register_clks(struct meson_mx_mmc_host *host)
        init.name = devm_kasprintf(host->controller_dev, GFP_KERNEL,
                                   "%s#fixed_factor",
                                   dev_name(host->controller_dev));
+       if (!init.name)
+               return -ENOMEM;
+
        init.ops = &clk_fixed_factor_ops;
        init.flags = 0;
        init.parent_names = &clk_fixed_factor_parent;
@@ -612,6 +615,9 @@ static int meson_mx_mmc_register_clks(struct meson_mx_mmc_host *host)
        clk_div_parent = __clk_get_name(host->fixed_factor_clk);
        init.name = devm_kasprintf(host->controller_dev, GFP_KERNEL,
                                   "%s#div", dev_name(host->controller_dev));
+       if (!init.name)
+               return -ENOMEM;
+
        init.ops = &clk_divider_ops;
        init.flags = CLK_SET_RATE_PARENT;
        init.parent_names = &clk_div_parent;