ASoC: simple-card-utils: Avoid NULL deref in asoc_simple_set_tdm()

Don't dereference simple_dai before it has been checked for NULL.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Fixes: 1e974e5b82b3 ("ASoC: audio_graph_card2: Add support for variable slot widths")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20220404113252.1152659-1-rf@opensource.cirrus.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/generic/simple-card-utils.c b/sound/soc/generic/simple-card-utils.c
index 8e03783..f215794 100644 (file)
--- a/sound/soc/generic/simple-card-utils.c
+++ b/sound/soc/generic/simple-card-utils.c
@@ -364,13 +364,15 @@ static int asoc_simple_set_tdm(struct snd_soc_dai *dai,
                                struct snd_pcm_hw_params *params)
 {
        int sample_bits = params_width(params);
-       int slot_width = simple_dai->slot_width;
-       int slot_count = simple_dai->slots;
+       int slot_width, slot_count;
        int i, ret;
 
        if (!simple_dai || !simple_dai->tdm_width_map)
                return 0;
 
+       slot_width = simple_dai->slot_width;
+       slot_count = simple_dai->slots;
+
        if (slot_width == 0)
                slot_width = sample_bits;