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Subject: media: imx274: fix stack corruption in imx274_read_reg Author: Luca Ceresoli luca@lucaceresoli.net Date: Mon Nov 26 11:35:07 2018 -0500

imx274_read_reg() takes a u8 pointer ("reg") and casts it to pass it to regmap_read(), which takes an unsigned int pointer. This results in a corrupted stack and random crashes.

Fixes: 0985dd306f72 ("media: imx274: V4l2 driver for Sony imx274 CMOS sensor")

Cc: stable@vger.kernel.org # for 4.15 and up Signed-off-by: Luca Ceresoli luca@lucaceresoli.net Signed-off-by: Sakari Ailus sakari.ailus@linux.intel.com Signed-off-by: Mauro Carvalho Chehab mchehab+samsung@kernel.org

drivers/media/i2c/imx274.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-)

---

diff --git a/drivers/media/i2c/imx274.c b/drivers/media/i2c/imx274.c index 11c69281692e..95a0e7d9851a 100644 --- a/drivers/media/i2c/imx274.c +++ b/drivers/media/i2c/imx274.c @@ -619,16 +619,19 @@ static int imx274_write_table(struct stimx274 *priv, const struct reg_8 table[])

static inline int imx274_read_reg(struct stimx274 *priv, u16 addr, u8 *val) { + unsigned int uint_val; int err;

- err = regmap_read(priv->regmap, addr, (unsigned int *)val); + err = regmap_read(priv->regmap, addr, &uint_val); if (err) dev_err(&priv->client->dev, "%s : i2c read failed, addr = %x\n", __func__, addr); else dev_dbg(&priv->client->dev, "%s : addr 0x%x, val=0x%x\n", __func__, - addr, *val); + addr, uint_val); + + *val = uint_val; return err; }