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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Jiasheng Jiang <jiasheng@iscas.ac.cn>,
        Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>,
        Mark Brown <broonie@kernel.org>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.19 115/239] ASoC: samsung: idma: Check of ioremap return value
Date:   Mon, 24 Jan 2022 19:42:33 +0100
Message-Id: <20220124183946.761209146@linuxfoundation.org>
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From: Jiasheng Jiang <jiasheng@iscas.ac.cn>

[ Upstream commit 3ecb46755eb85456b459a1a9f952c52986bce8ec ]

Because of the potential failure of the ioremap(), the buf->area could
be NULL.
Therefore, we need to check it and return -ENOMEM in order to transfer
the error.

Fixes: f09aecd50f39 ("ASoC: SAMSUNG: Add I2S0 internal dma driver")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Link: https://lore.kernel.org/r/20211228034026.1659385-1-jiasheng@iscas.ac.cn
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 sound/soc/samsung/idma.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/soc/samsung/idma.c b/sound/soc/samsung/idma.c
index b1f09b942410d..e397f5e10e33e 100644
--- a/sound/soc/samsung/idma.c
+++ b/sound/soc/samsung/idma.c
@@ -369,6 +369,8 @@ static int preallocate_idma_buffer(struct snd_pcm *pcm, int stream)
 	buf->addr = idma.lp_tx_addr;
 	buf->bytes = idma_hardware.buffer_bytes_max;
 	buf->area = (unsigned char * __force)ioremap(buf->addr, buf->bytes);
+	if (!buf->area)
+		return -ENOMEM;
 
 	return 0;
 }
-- 
2.34.1