[PATCH] ASoC: meson: fix memory leak of links if allocation of ldata fails

[PATCH] ASoC: meson: fix memory leak of links if allocation of ldata fails

[Colin King]

From: Colin Ian King <colin.king@canonical.com>

Currently if the allocation of ldata fails the error return path
does not kfree the allocated links object.  Fix this by adding
an error exit return path that performs the necessary kfree'ing.

Addresses-Coverity: ("Resource leak")
Fixes: 7864a79f37b5 ("ASoC: meson: add axg sound card support")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 sound/soc/meson/meson-card-utils.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/sound/soc/meson/meson-card-utils.c b/sound/soc/meson/meson-card-utils.c
index 2ca8c98e204f..5a4a91c88734 100644
--- a/sound/soc/meson/meson-card-utils.c
+++ b/sound/soc/meson/meson-card-utils.c
@@ -49,19 +49,26 @@ int meson_card_reallocate_links(struct snd_soc_card *card,
 	links = krealloc(priv->card.dai_link,
 			 num_links * sizeof(*priv->card.dai_link),
 			 GFP_KERNEL | __GFP_ZERO);
+	if (!links)
+		goto err_links;
+
 	ldata = krealloc(priv->link_data,
 			 num_links * sizeof(*priv->link_data),
 			 GFP_KERNEL | __GFP_ZERO);
-
-	if (!links || !ldata) {
-		dev_err(priv->card.dev, "failed to allocate links\n");
-		return -ENOMEM;
-	}
+	if (!ldata)
+		goto err_ldata;
 
 	priv->card.dai_link = links;
 	priv->link_data = ldata;
 	priv->card.num_links = num_links;
 	return 0;
+
+err_ldata:
+	kfree(links);
+err_links:
+	dev_err(priv->card.dev, "failed to allocate links\n");
+	return -ENOMEM;
+
 }
 EXPORT_SYMBOL_GPL(meson_card_reallocate_links);
 
-- 
2.25.1

Re: [PATCH] ASoC: meson: fix memory leak of links if allocation of ldata fails

[Jerome Brunet]

On Thu 04 Jun 2020 at 19:12, Colin King <colin.king@canonical.com> wrote:

> From: Colin Ian King <colin.king@canonical.com>
>
> Currently if the allocation of ldata fails the error return path
> does not kfree the allocated links object.  Fix this by adding
> an error exit return path that performs the necessary kfree'ing.
>
> Addresses-Coverity: ("Resource leak")
> Fixes: 7864a79f37b5 ("ASoC: meson: add axg sound card support")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>

Looks good, Thx

Acked-by: Jerome Brunet <jbrunet@baylibre.com>

> ---
>  sound/soc/meson/meson-card-utils.c | 17 ++++++++++++-----
>  1 file changed, 12 insertions(+), 5 deletions(-)
>
> diff --git a/sound/soc/meson/meson-card-utils.c b/sound/soc/meson/meson-card-utils.c
> index 2ca8c98e204f..5a4a91c88734 100644
> --- a/sound/soc/meson/meson-card-utils.c
> +++ b/sound/soc/meson/meson-card-utils.c
> @@ -49,19 +49,26 @@ int meson_card_reallocate_links(struct snd_soc_card *card,
>  	links = krealloc(priv->card.dai_link,
>  			 num_links * sizeof(*priv->card.dai_link),
>  			 GFP_KERNEL | __GFP_ZERO);
> +	if (!links)
> +		goto err_links;
> +
>  	ldata = krealloc(priv->link_data,
>  			 num_links * sizeof(*priv->link_data),
>  			 GFP_KERNEL | __GFP_ZERO);
> -
> -	if (!links || !ldata) {
> -		dev_err(priv->card.dev, "failed to allocate links\n");
> -		return -ENOMEM;
> -	}
> +	if (!ldata)
> +		goto err_ldata;
>  
>  	priv->card.dai_link = links;
>  	priv->link_data = ldata;
>  	priv->card.num_links = num_links;
>  	return 0;
> +
> +err_ldata:
> +	kfree(links);
> +err_links:
> +	dev_err(priv->card.dev, "failed to allocate links\n");
> +	return -ENOMEM;
> +
>  }
>  EXPORT_SYMBOL_GPL(meson_card_reallocate_links);

Re: [PATCH] ASoC: meson: fix memory leak of links if allocation of ldata fails

[Mark Brown]

On Thu, 4 Jun 2020 18:12:16 +0100, Colin King wrote:
> Currently if the allocation of ldata fails the error return path
> does not kfree the allocated links object.  Fix this by adding
> an error exit return path that performs the necessary kfree'ing.

Applied to

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

Thanks!

[1/1] ASoC: meson: fix memory leak of links if allocation of ldata fails
      commit: 6e801dc411329aff592fbd48fb116183d0acdb00

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