[alsa-devel] [PATCH 0/2] ASoC: topology: Fix memory leaks with ABI version mismatch

[alsa-devel] [PATCH 0/2] ASoC: topology: Fix memory leaks with ABI version mismatch

[Dragos Tarcatu]

The topology loader in soc-topology.c is currently accepting ABI
version mismatches for some topology components in order to keep
backwards compatibility with ABIv4. When dealing with these ABI
mismatch situations, temporary copies of the v4 objects are
allocated and passed on to the right driver topology handlers.
After that they're supposed to be freed.

However, memory leaks are currently possible in
soc_tplg_link_elems_load() and also soc_tplg_manifest_load().

These patches fix these.

I've originally created a PR on github for SOF at:
   https://github.com/thesofproject/linux/pull/1771
as my impression was this can affect older SOF toplogies.

But as it turns out this may impact Skylake instead.

Dragos Tarcatu (2):
  ASoC: topology: Fix memleak in soc_tplg_link_elems_load()
  ASoC: topology: Fix memleak in soc_tplg_manifest_load()

 sound/soc/soc-topology.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

-- 
2.17.1

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[alsa-devel] [PATCH 1/2] ASoC: topology: Fix memleak in soc_tplg_link_elems_load()

[Dragos Tarcatu]

If soc_tplg_link_config() fails, _link needs to be freed in case of
topology ABI version mismatch. However the current code is returning
directly and ends up leaking memory in this case.
This patch fixes that.

Fixes: 593d9e52f9bb ("ASoC: topology: Add support to configure existing physical DAI links")
Signed-off-by: Dragos Tarcatu <dragos_tarcatu@mentor.com>
---
 sound/soc/soc-topology.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/sound/soc/soc-topology.c b/sound/soc/soc-topology.c
index d2ee6ad20e83..69069f70e745 100644
--- a/sound/soc/soc-topology.c
+++ b/sound/soc/soc-topology.c
@@ -2377,8 +2377,11 @@ static int soc_tplg_link_elems_load(struct soc_tplg *tplg,
 		}
 
 		ret = soc_tplg_link_config(tplg, _link);
-		if (ret < 0)
+		if (ret < 0) {
+			if (!abi_match)
+				kfree(_link);
 			return ret;
+		}
 
 		/* offset by version-specific struct size and
 		 * real priv data size
-- 
2.17.1

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Applied "ASoC: topology: Fix memleak in soc_tplg_link_elems_load()" to the asoc tree

[Mark Brown]

The patch

   ASoC: topology: Fix memleak in soc_tplg_link_elems_load()

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 2b2d5c4db732c027a14987cfccf767dac1b45170 Mon Sep 17 00:00:00 2001
From: Dragos Tarcatu <dragos_tarcatu@mentor.com>
Date: Fri, 7 Feb 2020 20:53:24 +0200
Subject: [PATCH] ASoC: topology: Fix memleak in soc_tplg_link_elems_load()

If soc_tplg_link_config() fails, _link needs to be freed in case of
topology ABI version mismatch. However the current code is returning
directly and ends up leaking memory in this case.
This patch fixes that.

Fixes: 593d9e52f9bb ("ASoC: topology: Add support to configure existing physical DAI links")
Signed-off-by: Dragos Tarcatu <dragos_tarcatu@mentor.com>
Link: https://lore.kernel.org/r/20200207185325.22320-2-dragos_tarcatu@mentor.com
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 sound/soc/soc-topology.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/sound/soc/soc-topology.c b/sound/soc/soc-topology.c
index 107ba3ed5440..953517a73298 100644
--- a/sound/soc/soc-topology.c
+++ b/sound/soc/soc-topology.c
@@ -2376,8 +2376,11 @@ static int soc_tplg_link_elems_load(struct soc_tplg *tplg,
 		}
 
 		ret = soc_tplg_link_config(tplg, _link);
-		if (ret < 0)
+		if (ret < 0) {
+			if (!abi_match)
+				kfree(_link);
 			return ret;
+		}
 
 		/* offset by version-specific struct size and
 		 * real priv data size
-- 
2.20.1

[alsa-devel] [PATCH 2/2] ASoC: topology: Fix memleak in soc_tplg_manifest_load()

[Dragos Tarcatu]

In case of ABI version mismatch, _manifest needs to be freed as
it is just a copy of the original topology manifest. However, if
a driver manifest handler is defined, that would get executed and
the cleanup is never reached. Fix that by getting the return status
of manifest() instead of returning directly.

Fixes: 583958fa2e52 ("ASoC: topology: Make manifest backward compatible from ABI v4")
Signed-off-by: Dragos Tarcatu <dragos_tarcatu@mentor.com>
---
 sound/soc/soc-topology.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/sound/soc/soc-topology.c b/sound/soc/soc-topology.c
index 69069f70e745..575da6aba807 100644
--- a/sound/soc/soc-topology.c
+++ b/sound/soc/soc-topology.c
@@ -2545,7 +2545,7 @@ static int soc_tplg_manifest_load(struct soc_tplg *tplg,
 {
 	struct snd_soc_tplg_manifest *manifest, *_manifest;
 	bool abi_match;
-	int err;
+	int ret = 0;
 
 	if (tplg->pass != SOC_TPLG_PASS_MANIFEST)
 		return 0;
@@ -2558,19 +2558,19 @@ static int soc_tplg_manifest_load(struct soc_tplg *tplg,
 		_manifest = manifest;
 	} else {
 		abi_match = false;
-		err = manifest_new_ver(tplg, manifest, &_manifest);
-		if (err < 0)
-			return err;
+		ret = manifest_new_ver(tplg, manifest, &_manifest);
+		if (ret < 0)
+			return ret;
 	}
 
 	/* pass control to component driver for optional further init */
 	if (tplg->comp && tplg->ops && tplg->ops->manifest)
-		return tplg->ops->manifest(tplg->comp, tplg->index, _manifest);
+		ret = tplg->ops->manifest(tplg->comp, tplg->index, _manifest);
 
 	if (!abi_match)	/* free the duplicated one */
 		kfree(_manifest);
 
-	return 0;
+	return ret;
 }
 
 /* validate header magic, size and type */
-- 
2.17.1

_______________________________________________
Alsa-devel mailing list
Alsa-devel@alsa-project.org
https://mailman.alsa-project.org/mailman/listinfo/alsa-devel

Applied "ASoC: topology: Fix memleak in soc_tplg_manifest_load()" to the asoc tree

[Mark Brown]

The patch

   ASoC: topology: Fix memleak in soc_tplg_manifest_load()

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 242c46c023610dbc0213fc8fb6b71eb836bc5d95 Mon Sep 17 00:00:00 2001
From: Dragos Tarcatu <dragos_tarcatu@mentor.com>
Date: Fri, 7 Feb 2020 20:53:25 +0200
Subject: [PATCH] ASoC: topology: Fix memleak in soc_tplg_manifest_load()

In case of ABI version mismatch, _manifest needs to be freed as
it is just a copy of the original topology manifest. However, if
a driver manifest handler is defined, that would get executed and
the cleanup is never reached. Fix that by getting the return status
of manifest() instead of returning directly.

Fixes: 583958fa2e52 ("ASoC: topology: Make manifest backward compatible from ABI v4")
Signed-off-by: Dragos Tarcatu <dragos_tarcatu@mentor.com>
Link: https://lore.kernel.org/r/20200207185325.22320-3-dragos_tarcatu@mentor.com
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 sound/soc/soc-topology.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/sound/soc/soc-topology.c b/sound/soc/soc-topology.c
index 953517a73298..22c38df40d5a 100644
--- a/sound/soc/soc-topology.c
+++ b/sound/soc/soc-topology.c
@@ -2544,7 +2544,7 @@ static int soc_tplg_manifest_load(struct soc_tplg *tplg,
 {
 	struct snd_soc_tplg_manifest *manifest, *_manifest;
 	bool abi_match;
-	int err;
+	int ret = 0;
 
 	if (tplg->pass != SOC_TPLG_PASS_MANIFEST)
 		return 0;
@@ -2557,19 +2557,19 @@ static int soc_tplg_manifest_load(struct soc_tplg *tplg,
 		_manifest = manifest;
 	} else {
 		abi_match = false;
-		err = manifest_new_ver(tplg, manifest, &_manifest);
-		if (err < 0)
-			return err;
+		ret = manifest_new_ver(tplg, manifest, &_manifest);
+		if (ret < 0)
+			return ret;
 	}
 
 	/* pass control to component driver for optional further init */
 	if (tplg->comp && tplg->ops && tplg->ops->manifest)
-		return tplg->ops->manifest(tplg->comp, tplg->index, _manifest);
+		ret = tplg->ops->manifest(tplg->comp, tplg->index, _manifest);
 
 	if (!abi_match)	/* free the duplicated one */
 		kfree(_manifest);
 
-	return 0;
+	return ret;
 }
 
 /* validate header magic, size and type */
-- 
2.20.1