The patch
ASoC: compress: Only call free for components which have been opened
has been applied to the asoc tree at
https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git
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
From 572e6c8dd174bc6fc7ba5d9b6935e9ec8d2660f5 Mon Sep 17 00:00:00 2001
From: Charles Keepax ckeepax@opensource.cirrus.com Date: Tue, 24 Apr 2018 16:39:01 +0100 Subject: [PATCH] ASoC: compress: Only call free for components which have been opened
The core should only call free on a component if said component has already had open called on it. This is not presently the case and most compressed drivers in the kernel assume it will be. This causes null pointer dereferences in the drivers as they attempt clean up for stuff that was never put in place.
This is fixed by aborting calling open callbacks once a failure is encountered and then during clean up only iterating through the component list to that point.
This is a fairly quick fix to the issue, to allow backporting. There is more refactoring to follow to tidy the code up a little.
Fixes: 9e7e3738ab0e ("ASoC: snd_soc_component_driver has snd_compr_ops") Signed-off-by: Charles Keepax ckeepax@opensource.cirrus.com Acked-by: Vinod Koul vkoul@kernel.org Signed-off-by: Mark Brown broonie@kernel.org --- sound/soc/soc-compress.c | 52 +++++++++++++++++++++------------------- 1 file changed, 28 insertions(+), 24 deletions(-)
diff --git a/sound/soc/soc-compress.c b/sound/soc/soc-compress.c index 82402688bd8e..948505f74229 100644 --- a/sound/soc/soc-compress.c +++ b/sound/soc/soc-compress.c @@ -33,7 +33,7 @@ static int soc_compr_open(struct snd_compr_stream *cstream) struct snd_soc_component *component; struct snd_soc_rtdcom_list *rtdcom; struct snd_soc_dai *cpu_dai = rtd->cpu_dai; - int ret = 0, __ret; + int ret;
mutex_lock_nested(&rtd->pcm_mutex, rtd->pcm_subclass);
@@ -68,16 +68,15 @@ static int soc_compr_open(struct snd_compr_stream *cstream) !component->driver->compr_ops->open) continue;
- __ret = component->driver->compr_ops->open(cstream); - if (__ret < 0) { + ret = component->driver->compr_ops->open(cstream); + if (ret < 0) { dev_err(component->dev, "Compress ASoC: can't open platform %s: %d\n", - component->name, __ret); - ret = __ret; + component->name, ret); + goto machine_err; } } - if (ret < 0) - goto machine_err; + component = NULL;
if (rtd->dai_link->compr_ops && rtd->dai_link->compr_ops->startup) { ret = rtd->dai_link->compr_ops->startup(cstream); @@ -97,17 +96,20 @@ static int soc_compr_open(struct snd_compr_stream *cstream)
machine_err: for_each_rtdcom(rtd, rtdcom) { - component = rtdcom->component; + struct snd_soc_component *err_comp = rtdcom->component; + + if (err_comp == component) + break;
/* ignore duplication for now */ - if (platform && (component == &platform->component)) + if (platform && (err_comp == &platform->component)) continue;
- if (!component->driver->compr_ops || - !component->driver->compr_ops->free) + if (!err_comp->driver->compr_ops || + !err_comp->driver->compr_ops->free) continue;
- component->driver->compr_ops->free(cstream); + err_comp->driver->compr_ops->free(cstream); }
if (platform && platform->driver->compr_ops && platform->driver->compr_ops->free) @@ -132,7 +134,7 @@ static int soc_compr_open_fe(struct snd_compr_stream *cstream) struct snd_soc_dpcm *dpcm; struct snd_soc_dapm_widget_list *list; int stream; - int ret = 0, __ret; + int ret;
if (cstream->direction == SND_COMPRESS_PLAYBACK) stream = SNDRV_PCM_STREAM_PLAYBACK; @@ -172,16 +174,15 @@ static int soc_compr_open_fe(struct snd_compr_stream *cstream) !component->driver->compr_ops->open) continue;
- __ret = component->driver->compr_ops->open(cstream); - if (__ret < 0) { + ret = component->driver->compr_ops->open(cstream); + if (ret < 0) { dev_err(component->dev, "Compress ASoC: can't open platform %s: %d\n", - component->name, __ret); - ret = __ret; + component->name, ret); + goto machine_err; } } - if (ret < 0) - goto machine_err; + component = NULL;
if (fe->dai_link->compr_ops && fe->dai_link->compr_ops->startup) { ret = fe->dai_link->compr_ops->startup(cstream); @@ -236,17 +237,20 @@ static int soc_compr_open_fe(struct snd_compr_stream *cstream) fe->dai_link->compr_ops->shutdown(cstream); machine_err: for_each_rtdcom(fe, rtdcom) { - component = rtdcom->component; + struct snd_soc_component *err_comp = rtdcom->component; + + if (err_comp == component) + break;
/* ignore duplication for now */ - if (platform && (component == &platform->component)) + if (platform && (err_comp == &platform->component)) continue;
- if (!component->driver->compr_ops || - !component->driver->compr_ops->free) + if (!err_comp->driver->compr_ops || + !err_comp->driver->compr_ops->free) continue;
- component->driver->compr_ops->free(cstream); + err_comp->driver->compr_ops->free(cstream); }
if (platform && platform->driver->compr_ops && platform->driver->compr_ops->free)