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| author | Mauro Carvalho Chehab <m.chehab@samsung.com> | 2013-11-02 11:07:12 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-12-04 19:06:31 (GMT) |
| commit | db37112a30abfe0d32ed79fa9229c2f470ab7197 (patch) | |
| tree | c8c4f9293401a14a6747b75656b30e1a1d088550 /drivers/media | |
| parent | e771f35b22aac46a7a126ea90f28b7e96e970d34 (diff) | |
| download | linux-fsl-qoriq-db37112a30abfe0d32ed79fa9229c2f470ab7197.tar.xz | |
media: af9035: Don't use dynamic static allocation
commit 7760e148350bf6df95662bc0db3734e9d991cb03 upstream.
Dynamic static allocation is evil, as Kernel stack is too low, and
compilation 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 (64 bytes).
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Reviewed-by: Hans Verkuil <hans.verkuil@cisco.com>
Reviewed-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/media')
| -rw-r--r-- | drivers/media/usb/dvb-usb-v2/af9035.c | 29 |
1 files changed, 26 insertions, 3 deletions
diff --git a/drivers/media/usb/dvb-usb-v2/af9035.c b/drivers/media/usb/dvb-usb-v2/af9035.c index 1ea17dc..c8fcd78 100644 --- a/drivers/media/usb/dvb-usb-v2/af9035.c +++ b/drivers/media/usb/dvb-usb-v2/af9035.c @@ -21,6 +21,9 @@ #include "af9035.h" +/* Max transfer size done by I2C transfer functions */ +#define MAX_XFER_SIZE 64 + DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr); static u16 af9035_checksum(const u8 *buf, size_t len) @@ -126,10 +129,16 @@ 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[MAX_XFER_SIZE]; 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 -EOPNOTSUPP; + } + wbuf[0] = len; wbuf[1] = 2; wbuf[2] = 0; @@ -228,9 +237,16 @@ static int af9035_i2c_master_xfer(struct i2c_adapter *adap, msg[1].len); } else { /* I2C */ - u8 buf[5 + msg[0].len]; + u8 buf[MAX_XFER_SIZE]; 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 -EOPNOTSUPP; + } req.mbox |= ((msg[0].addr & 0x80) >> 3); buf[0] = msg[1].len; buf[1] = msg[0].addr << 1; @@ -257,9 +273,16 @@ static int af9035_i2c_master_xfer(struct i2c_adapter *adap, msg[0].len - 3); } else { /* I2C */ - u8 buf[5 + msg[0].len]; + u8 buf[MAX_XFER_SIZE]; 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 -EOPNOTSUPP; + } req.mbox |= ((msg[0].addr & 0x80) >> 3); buf[0] = msg[0].len; buf[1] = msg[0].addr << 1; |