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 a635df61f928c7f1164206754a937fa79010dc60..2a6ffb2abb33879d9be67edafede29712137a556 100644 (file)
--- 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;
 }