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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>
This commit is contained in:
Amadeusz Sławiński 2019-06-17 13:36:41 +02:00 committed by Mark Brown
parent e79986ce50
commit 6ee927f2f0
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GPG Key ID: 24D68B725D5487D0
1 changed files with 7 additions and 9 deletions
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16
sound/soc/intel/skylake/skl-ssp-clk.c
View File

@ -276,10 +276,8 @@ static void unregister_parent_src_clk(struct skl_clk_parent *pclk,
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 @@ static int skl_clk_dev_probe(struct platform_device *pdev)
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);