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

[ Upstream commit db8f91d424fe0ea6db337aca8bc05908bbce1498 ]

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 <quic_srivasam@quicinc.com>
Link: https://lore.kernel.org/r/1669098673-29703-1-git-send-email-quic_srivasam@quicinc.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
index e995e96ab9030cd046ca0a3807779c28183320f3..3a9c875534c1ff8327088430ed395f03879bd672 100644 (file)
--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -1168,6 +1168,8 @@ 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;
 
        list_for_each_entry(dpcm, &be->dpcm[stream].fe_clients, list_fe) {
                if (dpcm->fe == fe)