ASoC: Intel: Skylake: Fix NULL ptr dereference when unloading clk dev
When driver is probed, we iterate over NHLT and check if clk entries are
present. For each such entry we call register_skl_clk and keep the
result in data->clk[].
Currently data->clk is sparsely indexed using NHLT table iterator, while
when freeing we use number of registered entries. Let's just use
data->avail_clk_cnt as index, so it can be reset back in
unregister_src_clk.
Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/sound/soc/intel/skylake/skl-ssp-clk.c b/sound/soc/intel/skylake/skl-ssp-clk.c
index cda1b5f..5bb6e40 100644
--- a/sound/soc/intel/skylake/skl-ssp-clk.c
+++ b/sound/soc/intel/skylake/skl-ssp-clk.c
@@ -276,10 +276,8 @@
static void unregister_src_clk(struct skl_clk_data *dclk)
{
- u8 cnt = dclk->avail_clk_cnt;
-
- while (cnt--)
- clkdev_drop(dclk->clk[cnt]->lookup);
+ while (dclk->avail_clk_cnt--)
+ clkdev_drop(dclk->clk[dclk->avail_clk_cnt]->lookup);
}
static int skl_register_parent_clks(struct device *dev,
@@ -381,13 +379,13 @@
if (clks[i].rate_cfg[0].rate == 0)
continue;
- data->clk[i] = register_skl_clk(dev, &clks[i], clk_pdata, i);
- if (IS_ERR(data->clk[i])) {
- ret = PTR_ERR(data->clk[i]);
+ data->clk[data->avail_clk_cnt] = register_skl_clk(dev,
+ &clks[i], clk_pdata, i);
+
+ if (IS_ERR(data->clk[data->avail_clk_cnt])) {
+ ret = PTR_ERR(data->clk[data->avail_clk_cnt++]);
goto err_unreg_skl_clk;
}
-
- data->avail_clk_cnt++;
}
platform_set_drvdata(pdev, data);
