diff options
| author | Stefan Brüns <stefan.bruens@rwth-aachen.de> | 2017-02-12 13:02:13 -0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-04-21 09:31:24 +0200 |
| commit | 28d1e8b7ef81d254583f68627095f8a85e39597d (patch) | |
| tree | 0bcf65fce582de331df0e25ea931d2a43c52dadf | |
| parent | 36b62c08e72b9cff822d8d8e007d75302c71d68c (diff) | |
dvb-usb-firmware: don't do DMA on stack
commit 67b0503db9c29b04eadfeede6bebbfe5ddad94ef upstream.
The buffer allocation for the firmware data was changed in
commit 43fab9793c1f ("[media] dvb-usb: don't use stack for firmware load")
but the same applies for the reset value.
Fixes: 43fab9793c1f ("[media] dvb-usb: don't use stack for firmware load")
Signed-off-by: Stefan Brüns <stefan.bruens@rwth-aachen.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Cc: Ben Hutchings <ben@decadent.org.uk>
Cc: Brad Spengler <spender@grsecurity.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/media/usb/dvb-usb/dvb-usb-firmware.c | 22 |
1 files changed, 12 insertions, 10 deletions
diff --git a/drivers/media/usb/dvb-usb/dvb-usb-firmware.c b/drivers/media/usb/dvb-usb/dvb-usb-firmware.c index 53a11a064fc5..b8d2ac5833e9 100644 --- a/drivers/media/usb/dvb-usb/dvb-usb-firmware.c +++ b/drivers/media/usb/dvb-usb/dvb-usb-firmware.c @@ -36,16 +36,18 @@ static int usb_cypress_writemem(struct usb_device *udev,u16 addr,u8 *data, u8 le int usb_cypress_load_firmware(struct usb_device *udev, const struct firmware *fw, int type) { struct hexline *hx; - u8 reset; - int ret,pos=0; + u8 *buf; + int ret, pos = 0; + u16 cpu_cs_register = cypress[type].cpu_cs_register; - hx = kmalloc(sizeof(*hx), GFP_KERNEL); - if (!hx) + buf = kmalloc(sizeof(*hx), GFP_KERNEL); + if (!buf) return -ENOMEM; + hx = (struct hexline *)buf; /* stop the CPU */ - reset = 1; - if ((ret = usb_cypress_writemem(udev,cypress[type].cpu_cs_register,&reset,1)) != 1) + buf[0] = 1; + if (usb_cypress_writemem(udev, cpu_cs_register, buf, 1) != 1) err("could not stop the USB controller CPU."); while ((ret = dvb_usb_get_hexline(fw, hx, &pos)) > 0) { @@ -62,21 +64,21 @@ int usb_cypress_load_firmware(struct usb_device *udev, const struct firmware *fw } if (ret < 0) { err("firmware download failed at %d with %d",pos,ret); - kfree(hx); + kfree(buf); return ret; } if (ret == 0) { /* restart the CPU */ - reset = 0; - if (ret || usb_cypress_writemem(udev,cypress[type].cpu_cs_register,&reset,1) != 1) { + buf[0] = 0; + if (usb_cypress_writemem(udev, cpu_cs_register, buf, 1) != 1) { err("could not restart the USB controller CPU."); ret = -EINVAL; } } else ret = -EIO; - kfree(hx); + kfree(buf); return ret; } |