codecs: rt5682s: fix an incorrect NULL check on list iterator

The bug is here:
            if (!dai) {

The list iterator value 'dai' will *always* be set and non-NULL
by for_each_component_dais(), so it is incorrect to assume that
the iterator value will be NULL if the list is empty or no element
is found (In fact, it will be a bogus pointer to an invalid struct
object containing the HEAD). Otherwise it will bypass the check
'if (!dai) {' (never call dev_err() and never return -ENODEV;)
and lead to invalid memory access lately when calling
'rt5682s_set_bclk1_ratio(dai, factor);'.

To fix the bug, just return rt5682s_set_bclk1_ratio(dai, factor);
when found the 'dai', otherwise dev_err() and return -ENODEV;

Cc: stable@vger.kernel.org
Fixes: bdd229ab26be9 ("ASoC: rt5682s: Add driver for ALC5682I-VS codec")
Signed-off-by: Xiaomeng Tong <xiam0nd.tong@gmail.com>
Link: https://lore.kernel.org/r/20220327081300.12962-1-xiam0nd.tong@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/codecs/rt5682s.c b/sound/soc/codecs/rt5682s.c
index 1cba8ec..b55f3ac 100644 (file)
--- a/sound/soc/codecs/rt5682s.c
+++ b/sound/soc/codecs/rt5682s.c
@@ -2687,14 +2687,11 @@ static int rt5682s_bclk_set_rate(struct clk_hw *hw, unsigned long rate,
 
        for_each_component_dais(component, dai)
                if (dai->id == RT5682S_AIF1)
-                       break;
-       if (!dai) {
-               dev_err(component->dev, "dai %d not found in component\n",
-                       RT5682S_AIF1);
-               return -ENODEV;
-       }
+                       return rt5682s_set_bclk1_ratio(dai, factor);
 
-       return rt5682s_set_bclk1_ratio(dai, factor);
+       dev_err(component->dev, "dai %d not found in component\n",
+               RT5682S_AIF1);
+       return -ENODEV;
 }
 
 static const struct clk_ops rt5682s_dai_clk_ops[RT5682S_DAI_NUM_CLKS] = {