The patch

ASoC: samsung: i2s: Prevent potential NULL platform data dereference

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.

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Thanks, Mark

From 6e434122d9041c48841709385e823eef3225663e Mon Sep 17 00:00:00 2001

From: Sylwester Nawrocki s.nawrocki@samsung.com Date: Thu, 14 Feb 2019 16:58:40 +0100 Subject: [PATCH] ASoC: samsung: i2s: Prevent potential NULL platform data dereference

When np is NULL i2s_pdata could also be NULL but i2s_pdata is now being dereferenced without proper check. Fix this and shorten the error message so we don't exceed 80 characters limit.

Reported-by: Dan Carpenter dan.carpenter@oracle.com Signed-off-by: Sylwester Nawrocki s.nawrocki@samsung.com Signed-off-by: Mark Brown broonie@kernel.org --- sound/soc/samsung/i2s.c | 27 +++++++++++++++------------ 1 file changed, 15 insertions(+), 12 deletions(-)

diff --git a/sound/soc/samsung/i2s.c b/sound/soc/samsung/i2s.c index 03fff1c657be..02472f576e17 100644 --- a/sound/soc/samsung/i2s.c +++ b/sound/soc/samsung/i2s.c @@ -1369,7 +1369,7 @@ static int samsung_i2s_probe(struct platform_device *pdev) struct i2s_dai *pri_dai, *sec_dai = NULL; struct s3c_audio_pdata *i2s_pdata = pdev->dev.platform_data; struct resource *res; - u32 regs_base, quirks = 0, idma_addr = 0; + u32 regs_base, idma_addr = 0; struct device_node *np = pdev->dev.of_node; const struct samsung_i2s_dai_data *i2s_dai_data; int num_dais, ret; @@ -1389,11 +1389,19 @@ static int samsung_i2s_probe(struct platform_device *pdev) if (!priv) return -ENOMEM;

- quirks = np ? i2s_dai_data->quirks : i2s_pdata->type.quirks; - num_dais = (quirks & QUIRK_SEC_DAI) ? 2 : 1; + if (np) { + priv->quirks = i2s_dai_data->quirks; + } else { + if (!i2s_pdata) { + dev_err(&pdev->dev, "Missing platform data\n"); + return -EINVAL; + } + priv->quirks = i2s_pdata->type.quirks; + } + + num_dais = (priv->quirks & QUIRK_SEC_DAI) ? 2 : 1; priv->pdev = pdev; priv->variant_regs = i2s_dai_data->i2s_variant_regs; - priv->quirks = quirks;

ret = i2s_alloc_dais(priv, i2s_dai_data, num_dais); if (ret < 0) @@ -1405,11 +1413,6 @@ static int samsung_i2s_probe(struct platform_device *pdev) spin_lock_init(&priv->pcm_lock);

if (!np) { - if (i2s_pdata == NULL) { - dev_err(&pdev->dev, "Can't work without s3c_audio_pdata\n"); - return -EINVAL; - } - pri_dai->dma_playback.filter_data = i2s_pdata->dma_playback; pri_dai->dma_capture.filter_data = i2s_pdata->dma_capture; pri_dai->filter = i2s_pdata->dma_filter; @@ -1418,7 +1421,7 @@ static int samsung_i2s_probe(struct platform_device *pdev) } else { if (of_property_read_u32(np, "samsung,idma-addr", &idma_addr)) { - if (quirks & QUIRK_SUPPORTS_IDMA) { + if (priv->quirks & QUIRK_SUPPORTS_IDMA) { dev_info(&pdev->dev, "idma address is not"\ "specified"); } @@ -1451,7 +1454,7 @@ static int samsung_i2s_probe(struct platform_device *pdev) pri_dai->dma_capture.addr_width = 4; pri_dai->priv = priv;

- if (quirks & QUIRK_PRI_6CHAN) + if (priv->quirks & QUIRK_PRI_6CHAN) pri_dai->drv->playback.channels_max = 6;

ret = samsung_asoc_dma_platform_register(&pdev->dev, pri_dai->filter, @@ -1459,7 +1462,7 @@ static int samsung_i2s_probe(struct platform_device *pdev) if (ret < 0) goto err_disable_clk;

- if (quirks & QUIRK_SEC_DAI) { + if (priv->quirks & QUIRK_SEC_DAI) { sec_dai = &priv->dai[SAMSUNG_I2S_ID_SECONDARY - 1];

sec_dai->dma_playback.addr = regs_base + I2STXDS;