ASoC: samsung-i2s: Check secondary DAI exists before referencing

In a couple of places the driver is missing a check to ensure there is a
secondary DAI before it de-references the pointer to it, causing a null
pointer de-reference. This patch adds a check to avoid this.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Acked-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
Cc: stable@vger.kernel.org

1 files changed, 3 insertions, 2 deletions

diff --git a/sound/soc/samsung/i2s.c b/sound/soc/samsung/i2s.c
index 03eec22f0f46..9d513473b300 100644
--- a/sound/soc/samsung/i2s.c
+++ b/sound/soc/samsung/i2s.c
@@ -462,7 +462,7 @@ static int i2s_set_sysclk(struct snd_soc_dai *dai,
                 if (dir == SND_SOC_CLOCK_IN)
                         rfs = 0;
 
-                if ((rfs && other->rfs && (other->rfs != rfs)) ||
+                if ((rfs && other && other->rfs && (other->rfs != rfs)) ||
                                 (any_active(i2s) &&
                                 (((dir == SND_SOC_CLOCK_IN)
                                         && !(mod & MOD_CDCLKCON)) ||
@@ -762,7 +762,8 @@ static void i2s_shutdown(struct snd_pcm_substream *substream,
         } else {
                 u32 mod = readl(i2s->addr + I2SMOD);
                 i2s->cdclk_out = !(mod & MOD_CDCLKCON);
-                other->cdclk_out = i2s->cdclk_out;
+                if (other)
+                        other->cdclk_out = i2s->cdclk_out;
         }
         /* Reset any constraint on RFS and BFS */
         i2s->rfs = 0;