[PATCH v2] ASoC: soc-pcm: Add NULL check in BE reparenting

From: Srinivasa Rao Mandadapu
Date: Tue Nov 22 2022 - 01:33:29 EST


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@xxxxxxxxxxx>
---
Changes Since V1:
-- Update commit title.

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 493f003..a7810c7 100644
--- 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)
--
2.7.4