From d3de3088586de3945ef0778c1334d50886be552e Mon Sep 17 00:00:00 2001 From: Antti Palosaari Date: Thu, 7 Nov 2013 17:01:31 -0300 Subject: [PATCH] upstream: [media] m88ts2022: 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/tuners/m88ts2022.c | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-) diff --git a/drivers/media/tuners/m88ts2022.c b/drivers/media/tuners/m88ts2022.c index d78fa90..8e7a35d 100644 --- a/drivers/media/tuners/m88ts2022.c +++ b/drivers/media/tuners/m88ts2022.c @@ -22,17 +22,22 @@ static int m88ts2022_wr_regs(struct m88ts2022_priv *priv, u8 reg, const u8 *val, int len) { +#define MAX_WR_LEN 3 +#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); @@ -53,8 +58,10 @@ static int m88ts2022_wr_regs(struct m88ts2022_priv *priv, static int m88ts2022_rd_regs(struct m88ts2022_priv *priv, u8 reg, u8 *val, int len) { +#define MAX_RD_LEN 1 +#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, @@ -64,11 +71,14 @@ static int m88ts2022_rd_regs(struct m88ts2022_priv *priv, u8 reg, }, { .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; + ret = i2c_transfer(priv->i2c, msg, 2); if (ret == 2) { memcpy(val, buf, len); -- 2.7.4