diff options
author | Mauro Carvalho Chehab <m.chehab@samsung.com> | 2013-11-02 07:43:40 -0300 |
---|---|---|
committer | Mauro Carvalho Chehab <m.chehab@samsung.com> | 2013-11-08 09:45:44 -0200 |
commit | 0065a79a8698a953e4b201c5fce8db8940530578 (patch) | |
tree | f5eced51298613c03a3752d2c2fc9bf5983a0563 | |
parent | 1d7fa359d4c0fbb2756fa01cc47212908d90b7b0 (diff) |
[media] dw2102: Don't use dynamic static allocation
Dynamic static allocation is evil, as Kernel stack is too low, and
compilation complains about it on some archs:
drivers/media/usb/dvb-usb/dw2102.c:368:1: warning: 'dw2102_earda_i2c_transfer' uses dynamic stack allocation [enabled by default]
drivers/media/usb/dvb-usb/dw2102.c:449:1: warning: 'dw2104_i2c_transfer' uses dynamic stack allocation [enabled by default]
drivers/media/usb/dvb-usb/dw2102.c:512:1: warning: 'dw3101_i2c_transfer' uses dynamic stack allocation [enabled by default]
drivers/media/usb/dvb-usb/dw2102.c:621:1: warning: 's6x0_i2c_transfer' uses dynamic stack allocation [enabled by default]
Instead, let's enforce a limit for the buffer to be the max size of
a control URB payload data (64 bytes).
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Reviewed-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
-rw-r--r-- | drivers/media/usb/dvb-usb/dw2102.c | 90 |
1 files changed, 80 insertions, 10 deletions
diff --git a/drivers/media/usb/dvb-usb/dw2102.c b/drivers/media/usb/dvb-usb/dw2102.c index 6136a2c7dbfd..c1a63b2a6baa 100644 --- a/drivers/media/usb/dvb-usb/dw2102.c +++ b/drivers/media/usb/dvb-usb/dw2102.c @@ -30,6 +30,9 @@ #include "stb6100_proc.h" #include "m88rs2000.h" +/* Max transfer size done by I2C transfer functions */ +#define MAX_XFER_SIZE 64 + #ifndef USB_PID_DW2102 #define USB_PID_DW2102 0x2102 #endif @@ -308,7 +311,14 @@ static int dw2102_earda_i2c_transfer(struct i2c_adapter *adap, struct i2c_msg ms case 2: { /* read */ /* first write first register number */ - u8 ibuf[msg[1].len + 2], obuf[3]; + u8 ibuf[MAX_XFER_SIZE], obuf[3]; + + if (2 + msg[1].len > sizeof(ibuf)) { + warn("i2c rd: len=%d is too big!\n", + msg[1].len); + return -EOPNOTSUPP; + } + obuf[0] = msg[0].addr << 1; obuf[1] = msg[0].len; obuf[2] = msg[0].buf[0]; @@ -325,7 +335,14 @@ static int dw2102_earda_i2c_transfer(struct i2c_adapter *adap, struct i2c_msg ms switch (msg[0].addr) { case 0x68: { /* write to register */ - u8 obuf[msg[0].len + 2]; + u8 obuf[MAX_XFER_SIZE]; + + if (2 + msg[0].len > sizeof(obuf)) { + warn("i2c wr: len=%d is too big!\n", + msg[1].len); + return -EOPNOTSUPP; + } + obuf[0] = msg[0].addr << 1; obuf[1] = msg[0].len; memcpy(obuf + 2, msg[0].buf, msg[0].len); @@ -335,7 +352,14 @@ static int dw2102_earda_i2c_transfer(struct i2c_adapter *adap, struct i2c_msg ms } case 0x61: { /* write to tuner */ - u8 obuf[msg[0].len + 2]; + u8 obuf[MAX_XFER_SIZE]; + + if (2 + msg[0].len > sizeof(obuf)) { + warn("i2c wr: len=%d is too big!\n", + msg[1].len); + return -EOPNOTSUPP; + } + obuf[0] = msg[0].addr << 1; obuf[1] = msg[0].len; memcpy(obuf + 2, msg[0].buf, msg[0].len); @@ -401,7 +425,14 @@ static int dw2104_i2c_transfer(struct i2c_adapter *adap, struct i2c_msg msg[], i default: { if (msg[j].flags == I2C_M_RD) { /* read registers */ - u8 ibuf[msg[j].len + 2]; + u8 ibuf[MAX_XFER_SIZE]; + + if (2 + msg[j].len > sizeof(ibuf)) { + warn("i2c rd: len=%d is too big!\n", + msg[j].len); + return -EOPNOTSUPP; + } + dw210x_op_rw(d->udev, 0xc3, (msg[j].addr << 1) + 1, 0, ibuf, msg[j].len + 2, @@ -430,7 +461,14 @@ static int dw2104_i2c_transfer(struct i2c_adapter *adap, struct i2c_msg msg[], i } while (len > 0); } else { /* write registers */ - u8 obuf[msg[j].len + 2]; + u8 obuf[MAX_XFER_SIZE]; + + if (2 + msg[j].len > sizeof(obuf)) { + warn("i2c wr: len=%d is too big!\n", + msg[j].len); + return -EOPNOTSUPP; + } + obuf[0] = msg[j].addr << 1; obuf[1] = msg[j].len; memcpy(obuf + 2, msg[j].buf, msg[j].len); @@ -463,7 +501,13 @@ static int dw3101_i2c_transfer(struct i2c_adapter *adap, struct i2c_msg msg[], case 2: { /* read */ /* first write first register number */ - u8 ibuf[msg[1].len + 2], obuf[3]; + u8 ibuf[MAX_XFER_SIZE], obuf[3]; + + if (2 + msg[1].len > sizeof(ibuf)) { + warn("i2c rd: len=%d is too big!\n", + msg[1].len); + return -EOPNOTSUPP; + } obuf[0] = msg[0].addr << 1; obuf[1] = msg[0].len; obuf[2] = msg[0].buf[0]; @@ -481,7 +525,13 @@ static int dw3101_i2c_transfer(struct i2c_adapter *adap, struct i2c_msg msg[], case 0x60: case 0x0c: { /* write to register */ - u8 obuf[msg[0].len + 2]; + u8 obuf[MAX_XFER_SIZE]; + + if (2 + msg[0].len > sizeof(obuf)) { + warn("i2c wr: len=%d is too big!\n", + msg[0].len); + return -EOPNOTSUPP; + } obuf[0] = msg[0].addr << 1; obuf[1] = msg[0].len; memcpy(obuf + 2, msg[0].buf, msg[0].len); @@ -563,7 +613,14 @@ static int s6x0_i2c_transfer(struct i2c_adapter *adap, struct i2c_msg msg[], default: { if (msg[j].flags == I2C_M_RD) { /* read registers */ - u8 ibuf[msg[j].len]; + u8 ibuf[MAX_XFER_SIZE]; + + if (msg[j].len > sizeof(ibuf)) { + warn("i2c rd: len=%d is too big!\n", + msg[j].len); + return -EOPNOTSUPP; + } + dw210x_op_rw(d->udev, 0x91, 0, 0, ibuf, msg[j].len, DW210X_READ_MSG); @@ -590,7 +647,14 @@ static int s6x0_i2c_transfer(struct i2c_adapter *adap, struct i2c_msg msg[], } while (len > 0); } else if (j < (num - 1)) { /* write register addr before read */ - u8 obuf[msg[j].len + 2]; + u8 obuf[MAX_XFER_SIZE]; + + if (2 + msg[j].len > sizeof(obuf)) { + warn("i2c wr: len=%d is too big!\n", + msg[j].len); + return -EOPNOTSUPP; + } + obuf[0] = msg[j + 1].len; obuf[1] = (msg[j].addr << 1); memcpy(obuf + 2, msg[j].buf, msg[j].len); @@ -602,7 +666,13 @@ static int s6x0_i2c_transfer(struct i2c_adapter *adap, struct i2c_msg msg[], break; } else { /* write registers */ - u8 obuf[msg[j].len + 2]; + u8 obuf[MAX_XFER_SIZE]; + + if (2 + msg[j].len > sizeof(obuf)) { + warn("i2c wr: len=%d is too big!\n", + msg[j].len); + return -EOPNOTSUPP; + } obuf[0] = msg[j].len + 1; obuf[1] = (msg[j].addr << 1); memcpy(obuf + 2, msg[j].buf, msg[j].len); |