[083/145] ASoC: fix ak4104 register array access

From: Greg KH
Date: Fri Mar 12 2010 - 19:40:41 EST


2.6.32-stable review patch. If anyone has any objections, please let me know.

----------------
From: Daniel Mack <daniel@xxxxxxxx>

commit e555317c083fda01f516d2153589e82514e20e70 upstream.

Don't touch the variable 'reg' to construct the value for the actual SPI
transport. This variable is again used to access the driver's register
cache, and so random memory is overwritten.
Compute the value in-place instead.

Signed-off-by: Daniel Mack <daniel@xxxxxxxx>
Acked-by: Liam Girdwood <lrg@xxxxxxxxxxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
sound/soc/codecs/ak4104.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)

--- a/sound/soc/codecs/ak4104.c
+++ b/sound/soc/codecs/ak4104.c
@@ -90,12 +90,10 @@ static int ak4104_spi_write(struct snd_s
if (reg >= codec->reg_cache_size)
return -EINVAL;

- reg &= AK4104_REG_MASK;
- reg |= AK4104_WRITE;
-
/* only write to the hardware if value has changed */
if (cache[reg] != value) {
- u8 tmp[2] = { reg, value };
+ u8 tmp[2] = { (reg & AK4104_REG_MASK) | AK4104_WRITE, value };
+
if (spi_write(spi, tmp, sizeof(tmp))) {
dev_err(&spi->dev, "SPI write failed\n");
return -EIO;


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/