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Subject: media: dvb: i2c transfers over usb cannot be done from stack Author: Laurent Caumont lcaumont2@gmail.com Date: Sat Nov 11 12:44:46 2017 -0500

Cc: stable@vger.kernel.org Signed-off-by: Laurent Caumont lcaumont2@gmail.com Signed-off-by: Sean Young sean@mess.org Signed-off-by: Mauro Carvalho Chehab mchehab@s-opensource.com

drivers/media/usb/dvb-usb/dibusb-common.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-)

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diff --git a/drivers/media/usb/dvb-usb/dibusb-common.c b/drivers/media/usb/dvb-usb/dibusb-common.c index 8207e6900656..bcacb0f22028 100644 --- a/drivers/media/usb/dvb-usb/dibusb-common.c +++ b/drivers/media/usb/dvb-usb/dibusb-common.c @@ -223,8 +223,20 @@ EXPORT_SYMBOL(dibusb_i2c_algo);

int dibusb_read_eeprom_byte(struct dvb_usb_device *d, u8 offs, u8 *val) { - u8 wbuf[1] = { offs }; - return dibusb_i2c_msg(d, 0x50, wbuf, 1, val, 1); + u8 *buf; + int rc; + + buf = kmalloc(2, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + buf[0] = offs; + + rc = dibusb_i2c_msg(d, 0x50, &buf[0], 1, &buf[1], 1); + *val = buf[1]; + kfree(buf); + + return rc; } EXPORT_SYMBOL(dibusb_read_eeprom_byte);