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[v2] ASoC: soc-pcm: don't use soc_pcm_ret() on .prepare callback

Message ID 87bjxg8jju.wl-kuninori.morimoto.gx@renesas.com (mailing list archive)
State Accepted
Commit 301c26a018acb94dd537a4418cefa0f654500c6f
Headers show
Series [v2] ASoC: soc-pcm: don't use soc_pcm_ret() on .prepare callback | expand

Commit Message

Kuninori Morimoto Dec. 13, 2024, 1:21 a.m. UTC 
commit 1f5664351410 ("ASoC: lower "no backend DAIs enabled for ... Port"
log severity") ignores -EINVAL error message on common soc_pcm_ret().
It is used from many functions, ignoring -EINVAL is over-kill.

The reason why -EINVAL was ignored was it really should only be used
upon invalid parameters coming from userspace and in that case we don't
want to log an error since we do not want to give userspace a way to do
a denial-of-service attack on the syslog / diskspace.

So don't use soc_pcm_ret() on .prepare callback is better idea.

Link: https://lore.kernel.org/r/87v7vptzap.wl-kuninori.morimoto.gx@renesas.com
Cc: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
---
v1 -> v2
	- Change idea not to use soc_pcm_ret() on .prepare callback

 sound/soc/soc-pcm.c | 32 ++++++++++++++++++++++++++++----
 1 file changed, 28 insertions(+), 4 deletions(-)

Comments

Mark Brown Dec. 16, 2024, 3:12 p.m. UTC | #1 
On Fri, 13 Dec 2024 01:21:10 +0000, Kuninori Morimoto wrote:
> commit 1f5664351410 ("ASoC: lower "no backend DAIs enabled for ... Port"
> log severity") ignores -EINVAL error message on common soc_pcm_ret().
> It is used from many functions, ignoring -EINVAL is over-kill.
> 
> The reason why -EINVAL was ignored was it really should only be used
> upon invalid parameters coming from userspace and in that case we don't
> want to log an error since we do not want to give userspace a way to do
> a denial-of-service attack on the syslog / diskspace.
> 
> [...]

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next

Thanks!

[1/1] ASoC: soc-pcm: don't use soc_pcm_ret() on .prepare callback
      commit: 301c26a018acb94dd537a4418cefa0f654500c6f

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark
diff mbox series

Patch

diff --git a/sound/soc/soc-pcm.c b/sound/soc/soc-pcm.c
index 1150455619aa4..88b3ad5a25520 100644
--- a/sound/soc/soc-pcm.c
+++ b/sound/soc/soc-pcm.c
@@ -38,7 +38,6 @@  static inline int _soc_pcm_ret(struct snd_soc_pcm_runtime *rtd,
 	switch (ret) {
 	case -EPROBE_DEFER:
 	case -ENOTSUPP:
-	case -EINVAL:
 		break;
 	default:
 		dev_err(rtd->dev,
@@ -986,7 +985,13 @@  static int __soc_pcm_prepare(struct snd_soc_pcm_runtime *rtd,
 	}
 
 out:
-	return soc_pcm_ret(rtd, ret);
+	/*
+	 * Don't use soc_pcm_ret() on .prepare callback to lower error log severity
+	 *
+	 * We don't want to log an error since we do not want to give userspace a way to do a
+	 * denial-of-service attack on the syslog / diskspace.
+	 */
+	return ret;
 }
 
 /* PCM prepare ops for non-DPCM streams */
@@ -998,6 +1003,13 @@  static int soc_pcm_prepare(struct snd_pcm_substream *substream)
 	snd_soc_dpcm_mutex_lock(rtd);
 	ret = __soc_pcm_prepare(rtd, substream);
 	snd_soc_dpcm_mutex_unlock(rtd);
+
+	/*
+	 * Don't use soc_pcm_ret() on .prepare callback to lower error log severity
+	 *
+	 * We don't want to log an error since we do not want to give userspace a way to do a
+	 * denial-of-service attack on the syslog / diskspace.
+	 */
 	return ret;
 }
 
@@ -2539,7 +2551,13 @@  int dpcm_be_dai_prepare(struct snd_soc_pcm_runtime *fe, int stream)
 		be->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;
 	}
 
-	return soc_pcm_ret(fe, ret);
+	/*
+	 * Don't use soc_pcm_ret() on .prepare callback to lower error log severity
+	 *
+	 * We don't want to log an error since we do not want to give userspace a way to do a
+	 * denial-of-service attack on the syslog / diskspace.
+	 */
+	return ret;
 }
 
 static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
@@ -2579,7 +2597,13 @@  static int dpcm_fe_dai_prepare(struct snd_pcm_substream *substream)
 	dpcm_set_fe_update_state(fe, stream, SND_SOC_DPCM_UPDATE_NO);
 	snd_soc_dpcm_mutex_unlock(fe);
 
-	return soc_pcm_ret(fe, ret);
+	/*
+	 * Don't use soc_pcm_ret() on .prepare callback to lower error log severity
+	 *
+	 * We don't want to log an error since we do not want to give userspace a way to do a
+	 * denial-of-service attack on the syslog / diskspace.
+	 */
+	return ret;
 }
 
 static int dpcm_run_update_shutdown(struct snd_soc_pcm_runtime *fe, int stream)