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authorJohan Hovold <johan@kernel.org>2017-01-12 18:17:43 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-01-26 08:23:48 +0100
commit75c60df15c8579ec08fe0c840b8fa5b5a5be1155 (patch)
treebac64f48dc75c23b68974c64c7aa2b89e0c6b40f /drivers/hid
parent0f37d20fdc70ee54f002bd77ce54a2a303ad0437 (diff)
HID: corsair: fix control-transfer error handling
commit 7a546af50eb78ab99840903083231eb635c8a566 upstream. Make sure to check for short control transfers in order to avoid parsing uninitialised buffer data and leaking it to user space. Note that the backlight and macro-mode buffer constraints are kept as loose as possible in order to avoid any regressions should the current buffer sizes be larger than necessary. Fixes: 6f78193ee9ea ("HID: corsair: Add Corsair Vengeance K90 driver") Signed-off-by: Johan Hovold <johan@kernel.org> Signed-off-by: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hid')
-rw-r--r--drivers/hid/hid-corsair.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/hid/hid-corsair.c b/drivers/hid/hid-corsair.c
index f4367d6e0511..88be56321610 100644
--- a/drivers/hid/hid-corsair.c
+++ b/drivers/hid/hid-corsair.c
@@ -159,7 +159,7 @@ static enum led_brightness k90_backlight_get(struct led_classdev *led_cdev)
USB_DIR_IN | USB_TYPE_VENDOR |
USB_RECIP_DEVICE, 0, 0, data, 8,
USB_CTRL_SET_TIMEOUT);
- if (ret < 0) {
+ if (ret < 5) {
dev_warn(dev, "Failed to get K90 initial state (error %d).\n",
ret);
ret = -EIO;
@@ -274,7 +274,7 @@ static ssize_t k90_show_macro_mode(struct device *dev,
USB_DIR_IN | USB_TYPE_VENDOR |
USB_RECIP_DEVICE, 0, 0, data, 2,
USB_CTRL_SET_TIMEOUT);
- if (ret < 0) {
+ if (ret < 1) {
dev_warn(dev, "Failed to get K90 initial mode (error %d).\n",
ret);
ret = -EIO;
@@ -351,7 +351,7 @@ static ssize_t k90_show_current_profile(struct device *dev,
USB_DIR_IN | USB_TYPE_VENDOR |
USB_RECIP_DEVICE, 0, 0, data, 8,
USB_CTRL_SET_TIMEOUT);
- if (ret < 0) {
+ if (ret < 8) {
dev_warn(dev, "Failed to get K90 initial state (error %d).\n",
ret);
ret = -EIO;