[PATCH AUTOSEL 6.6 28/33] ALSA: PCM: Allow resume only for suspended streams

[Sasha Levin]

From: Takashi Iwai <tiwai@xxxxxxx>

[ Upstream commit 1225675ca74c746f09211528588e83b3def1ff6a ]

snd_pcm_resume() should bail out if the stream isn't in a suspended
state.  Otherwise it'd allow doubly resume.

Link: https://patch.msgid.link/20240624125443.27808-1-tiwai@xxxxxxx
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 sound/core/pcm_native.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index bd9ddf412b465..cc21c483c4a57 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -1783,6 +1783,8 @@ static int snd_pcm_pre_resume(struct snd_pcm_substream *substream,
 			      snd_pcm_state_t state)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
+	if (runtime->state != SNDRV_PCM_STATE_SUSPENDED)
+		return -EBADFD;
 	if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
 		return -ENOSYS;
 	runtime->trigger_master = substream;
-- 
2.43.0