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 --- sound/soc/codecs/rt5682s.c | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-)
diff --git a/sound/soc/codecs/rt5682s.c b/sound/soc/codecs/rt5682s.c index 1e662d1be2b3..c890e51ff953 100644 --- a/sound/soc/codecs/rt5682s.c +++ b/sound/soc/codecs/rt5682s.c @@ -2686,14 +2686,11 @@ 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] = {