From: Srinivasa Rao Mandadapu quic_srivasam@quicinc.com

[ 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@qu... Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- sound/soc/soc-pcm.c | 2 ++ 1 file changed, 2 insertions(+)

diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c index 6c31a909845c..f6cebe2b3cbb 100644 --- a/sound/soc/soc-pcm.c +++ b/sound/soc/soc-pcm.c @@ -1182,6 +1182,8 @@ 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)