Re: [PATCH] ASoC: soc-pcm.c: Add NULL check in BE reparenting

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On 2022-11-21 2:04 PM, Srinivasa Rao Mandadapu wrote:
Add NULL check in dpcm_be_reparent API, to handle
kernel NULL pointer dereference error.

Signed-off-by: Srinivasa Rao Mandadapu <quic_srivasam@xxxxxxxxxxx>
---
  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)


Hello,

Could you provide reproduction steps that lead to null-ptr-deref popping up? Also, please drop '.c' in commit title.


Regards,
Czarek



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