From: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Date: Tue, 28 Dec 2021 03:40:26 +0000 (+0800)
Subject: ASoC: samsung: idma: Check of ioremap return value
X-Git-Tag: v4.4.300~63
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1677aad6534dfe8d04c3eb76fdcaef6f50bb1c69;p=thirdparty%2Fkernel%2Fstable.git

ASoC: samsung: idma: Check of ioremap return value

[ 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>
---

diff --git a/sound/soc/samsung/idma.c b/sound/soc/samsung/idma.c
index 4ed29ffc1c54e..d9cd9350ffbe2 100644
--- a/sound/soc/samsung/idma.c
+++ b/sound/soc/samsung/idma.c
@@ -370,6 +370,8 @@ 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;
 }