From mboxrd@z Thu Jan 1 00:00:00 1970 From: Krzysztof Kozlowski Subject: [RFT 1/2] ASoC: samsung: Fix possible double iounmap on s3c24xx driver probe failure Date: Wed, 26 Jul 2017 20:57:28 +0200 Message-ID: <20170726185729.28897-1-krzk@kernel.org> Return-path: Sender: linux-kernel-owner@vger.kernel.org To: Krzysztof Kozlowski , Sangbeom Kim , Sylwester Nawrocki , Liam Girdwood , Mark Brown , Jaroslav Kysela , Takashi Iwai , alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org Cc: Arvind Yadav List-Id: alsa-devel@alsa-project.org Commit 87b132bc0315 ("ASoC: samsung: s3c24{xx,12}-i2s: port to use generic dmaengine API") moved ioremap() call from s3c-i2s-v2.c:s3c_i2sv2_probe() to s3c2412-i2s.c:s3c2412_iis_dev_probe() and converted it to devm- resource managed interface. However the error path in first of them - s3c_i2sv2_probe() - was not updated. If getting a iis clock in s3c_i2sv2_probe() failed, the address space would be unmapped there. This could lead to: 1. double iounmap() later from devm-interface of s3c2412_iis_dev_probe()), 2. accessing the memory by other functions in s3c2412-i2s.c unit. Anyway, the owner of this mapped region should be s3c2412-i2s.c because it starts the mapping. Affected are drivers for S3C24xx family although issue was not reproduced. Fixes: 87b132bc0315 ("ASoC: samsung: s3c24{xx,12}-i2s: port to use generic dmaengine API") Signed-off-by: Krzysztof Kozlowski --- Not marking as Cc-stable because this is theoretical problem, not reproduced and also not tested. Please, kindly test on S3C24xx hardware. --- sound/soc/samsung/s3c-i2s-v2.c | 1 - 1 file changed, 1 deletion(-) diff --git a/sound/soc/samsung/s3c-i2s-v2.c b/sound/soc/samsung/s3c-i2s-v2.c index ca522a95160b..9b28046eea8e 100644 --- a/sound/soc/samsung/s3c-i2s-v2.c +++ b/sound/soc/samsung/s3c-i2s-v2.c @@ -634,7 +634,6 @@ int s3c_i2sv2_probe(struct snd_soc_dai *dai, i2s->iis_pclk = clk_get(dev, "iis"); if (IS_ERR(i2s->iis_pclk)) { dev_err(dev, "failed to get iis_clock\n"); - iounmap(i2s->regs); return -ENOENT; } -- 2.11.0