From 63c80f70435c5ecac0f94a1331a7dee249ba345b Mon Sep 17 00:00:00 2001 From: Antti Palosaari Date: Thu, 7 Nov 2013 17:35:43 -0300 Subject: [PATCH] [media] m88ds3103: do not use dynamic stack allocation I2C transfer were using dynamic stack allocation. Get rid of it. Signed-off-by: Antti Palosaari Signed-off-by: Mauro Carvalho Chehab --- drivers/media/dvb-frontends/m88ds3103.c | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-) diff --git a/drivers/media/dvb-frontends/m88ds3103.c b/drivers/media/dvb-frontends/m88ds3103.c index 91b3729db604..302c923aa306 100644 --- a/drivers/media/dvb-frontends/m88ds3103.c +++ b/drivers/media/dvb-frontends/m88ds3103.c @@ -26,17 +26,22 @@ static struct dvb_frontend_ops m88ds3103_ops; static int m88ds3103_wr_regs(struct m88ds3103_priv *priv, u8 reg, const u8 *val, int len) { +#define MAX_WR_LEN 32 +#define MAX_WR_XFER_LEN (MAX_WR_LEN + 1) int ret; - u8 buf[1 + len]; + u8 buf[MAX_WR_XFER_LEN]; struct i2c_msg msg[1] = { { .addr = priv->cfg->i2c_addr, .flags = 0, - .len = sizeof(buf), + .len = 1 + len, .buf = buf, } }; + if (WARN_ON(len > MAX_WR_LEN)) + return -EINVAL; + buf[0] = reg; memcpy(&buf[1], val, len); @@ -59,8 +64,10 @@ static int m88ds3103_wr_regs(struct m88ds3103_priv *priv, static int m88ds3103_rd_regs(struct m88ds3103_priv *priv, u8 reg, u8 *val, int len) { +#define MAX_RD_LEN 3 +#define MAX_RD_XFER_LEN (MAX_RD_LEN) int ret; - u8 buf[len]; + u8 buf[MAX_RD_XFER_LEN]; struct i2c_msg msg[2] = { { .addr = priv->cfg->i2c_addr, @@ -70,11 +77,14 @@ static int m88ds3103_rd_regs(struct m88ds3103_priv *priv, }, { .addr = priv->cfg->i2c_addr, .flags = I2C_M_RD, - .len = sizeof(buf), + .len = len, .buf = buf, } }; + if (WARN_ON(len > MAX_RD_LEN)) + return -EINVAL; + mutex_lock(&priv->i2c_mutex); ret = i2c_transfer(priv->i2c, msg, 2); mutex_unlock(&priv->i2c_mutex);