ASoC: soc-pcm: Add NULL check in BE reparenting

Add NULL check in dpcm_be_reparent API, to handle
kernel NULL pointer dereference error.
The issue occurred in fuzzing test.

Signed-off-by: Srinivasa Rao Mandadapu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
index 8ceded22a3c462f3d8c2148d4e2927cc7052cf42..35a16c3f9591badb85b944502dc13bc4161de5cb 100644 (file)
--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -1247,6 +1247,8 @@ static void dpcm_be_reparent(struct snd_soc_pcm_runtime *fe,
                return;
 
        be_substream = snd_soc_dpcm_get_substream(be, stream);
+       if (!be_substream)
+               return;
 
        for_each_dpcm_fe(be, stream, dpcm) {
                if (dpcm->fe == fe)