Dynamic static allocation is evil, as Kernel stack is too low, and
ompilation complains about it on some archs:
drivers/media/usb/dvb-usb-v2/af9035.c:142:1: warning: 'af9035_wr_regs'
uses dynamic stack allocation [enabled by default]
drivers/media/usb/dvb-usb-v2/af9035.c:305:1: warning:
'af9035_i2c_master_xfer' 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 (80 bytes).
Signed-off-by: Mauro Carvalho Chehab <m.che...@samsung.com>
---
drivers/media/usb/dvb-usb-v2/af9035.c | 26 +++++++++++++++++++++++---
1 file changed, 23 insertions(+), 3 deletions(-)
diff --git a/drivers/media/usb/dvb-usb-v2/af9035.c
b/drivers/media/usb/dvb-usb-v2/af9035.c
index 1ea17dc2a76e..f43e9f336204 100644
--- a/drivers/media/usb/dvb-usb-v2/af9035.c
+++ b/drivers/media/usb/dvb-usb-v2/af9035.c
@@ -126,10 +126,16 @@ exit:
/* write multiple registers */
static int af9035_wr_regs(struct dvb_usb_device *d, u32 reg, u8 *val, int len)
{
- u8 wbuf[6 + len];
+ u8 wbuf[80];
u8 mbox = (reg >> 16) & 0xff;
struct usb_req req = { CMD_MEM_WR, mbox, sizeof(wbuf), wbuf, 0, NULL };
+ if (6 + len > sizeof(wbuf)) {
+ dev_warn(&d->udev->dev, "%s: i2c wr: len=%d is too big!\n",
+ KBUILD_MODNAME, len);
+ return -EREMOTEIO;
+ }
+
wbuf[0] = len;
wbuf[1] = 2;
wbuf[2] = 0;
@@ -228,9 +234,16 @@ static int af9035_i2c_master_xfer(struct i2c_adapter *adap,
msg[1].len);
} else {
/* I2C */
- u8 buf[5 + msg[0].len];
+ u8 buf[80];
struct usb_req req = { CMD_I2C_RD, 0, sizeof(buf),
buf, msg[1].len, msg[1].buf };
+
+ if (5 + msg[0].len > sizeof(buf)) {
+ dev_warn(&d->udev->dev,
+ "%s: i2c xfer: len=%d is too big!\n",
+ KBUILD_MODNAME, msg[0].len);
+ return -EREMOTEIO;
+ }
req.mbox |= ((msg[0].addr & 0x80) >> 3);
buf[0] = msg[1].len;
buf[1] = msg[0].addr << 1;
@@ -257,9 +270,16 @@ static int af9035_i2c_master_xfer(struct i2c_adapter *adap,
msg[0].len - 3);
} else {
/* I2C */
- u8 buf[5 + msg[0].len];
+ u8 buf[80];
struct usb_req req = { CMD_I2C_WR, 0, sizeof(buf), buf,
0, NULL };
+
+ if (5 + msg[0].len > sizeof(buf)) {
+ dev_warn(&d->udev->dev,
+ "%s: i2c xfer: len=%d is too big!\n",
+ KBUILD_MODNAME, msg[0].len);
+ return -EREMOTEIO;
+ }
req.mbox |= ((msg[0].addr & 0x80) >> 3);
buf[0] = msg[0].len;
buf[1] = msg[0].addr << 1;
--
1.8.3.1
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