HID: fix a couple of off-by-ones
Jiri Kosina [Thu, 21 Aug 2014 14:57:48 +0000 (09:57 -0500)]
commit 4ab25786c87eb20857bbb715c3ae34ec8fd6a214 upstream.

There are a few very theoretical off-by-one bugs in report descriptor size
checking when performing a pre-parsing fixup. Fix those.

Reported-by: Ben Hawkes <hawkes@google.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/hid/hid-cherry.c
drivers/hid/hid-kye.c
drivers/hid/hid-lg.c
drivers/hid/hid-monterey.c
drivers/hid/hid-petalynx.c
drivers/hid/hid-sunplus.c

index 1bdcccc..f745d2c 100644 (file)
@@ -28,7 +28,7 @@
 static __u8 *ch_report_fixup(struct hid_device *hdev, __u8 *rdesc,
                unsigned int *rsize)
 {
-       if (*rsize >= 17 && rdesc[11] == 0x3c && rdesc[12] == 0x02) {
+       if (*rsize >= 18 && rdesc[11] == 0x3c && rdesc[12] == 0x02) {
                hid_info(hdev, "fixing up Cherry Cymotion report descriptor\n");
                rdesc[11] = rdesc[16] = 0xff;
                rdesc[12] = rdesc[17] = 0x03;
index 6af90db..843f2dd 100644 (file)
@@ -280,7 +280,7 @@ static __u8 *kye_report_fixup(struct hid_device *hdev, __u8 *rdesc,
                 *   - change the button usage range to 4-7 for the extra
                 *     buttons
                 */
-               if (*rsize >= 74 &&
+               if (*rsize >= 75 &&
                        rdesc[61] == 0x05 && rdesc[62] == 0x08 &&
                        rdesc[63] == 0x19 && rdesc[64] == 0x08 &&
                        rdesc[65] == 0x29 && rdesc[66] == 0x0f &&
index 06eb45f..12fc48c 100644 (file)
@@ -345,14 +345,14 @@ static __u8 *lg_report_fixup(struct hid_device *hdev, __u8 *rdesc,
        struct usb_device_descriptor *udesc;
        __u16 bcdDevice, rev_maj, rev_min;
 
-       if ((drv_data->quirks & LG_RDESC) && *rsize >= 90 && rdesc[83] == 0x26 &&
+       if ((drv_data->quirks & LG_RDESC) && *rsize >= 91 && rdesc[83] == 0x26 &&
                        rdesc[84] == 0x8c && rdesc[85] == 0x02) {
                hid_info(hdev,
                         "fixing up Logitech keyboard report descriptor\n");
                rdesc[84] = rdesc[89] = 0x4d;
                rdesc[85] = rdesc[90] = 0x10;
        }
-       if ((drv_data->quirks & LG_RDESC_REL_ABS) && *rsize >= 50 &&
+       if ((drv_data->quirks & LG_RDESC_REL_ABS) && *rsize >= 51 &&
                        rdesc[32] == 0x81 && rdesc[33] == 0x06 &&
                        rdesc[49] == 0x81 && rdesc[50] == 0x06) {
                hid_info(hdev,
index 9e14c00..25daf28 100644 (file)
@@ -24,7 +24,7 @@
 static __u8 *mr_report_fixup(struct hid_device *hdev, __u8 *rdesc,
                unsigned int *rsize)
 {
-       if (*rsize >= 30 && rdesc[29] == 0x05 && rdesc[30] == 0x09) {
+       if (*rsize >= 31 && rdesc[29] == 0x05 && rdesc[30] == 0x09) {
                hid_info(hdev, "fixing up button/consumer in HID report descriptor\n");
                rdesc[30] = 0x0c;
        }
index 736b250..6aca4f2 100644 (file)
@@ -25,7 +25,7 @@
 static __u8 *pl_report_fixup(struct hid_device *hdev, __u8 *rdesc,
                unsigned int *rsize)
 {
-       if (*rsize >= 60 && rdesc[39] == 0x2a && rdesc[40] == 0xf5 &&
+       if (*rsize >= 62 && rdesc[39] == 0x2a && rdesc[40] == 0xf5 &&
                        rdesc[41] == 0x00 && rdesc[59] == 0x26 &&
                        rdesc[60] == 0xf9 && rdesc[61] == 0x00) {
                hid_info(hdev, "fixing up Petalynx Maxter Remote report descriptor\n");
index 87fc91e..91072fa 100644 (file)
@@ -24,7 +24,7 @@
 static __u8 *sp_report_fixup(struct hid_device *hdev, __u8 *rdesc,
                unsigned int *rsize)
 {
-       if (*rsize >= 107 && rdesc[104] == 0x26 && rdesc[105] == 0x80 &&
+       if (*rsize >= 112 && rdesc[104] == 0x26 && rdesc[105] == 0x80 &&
                        rdesc[106] == 0x03) {
                hid_info(hdev, "fixing up Sunplus Wireless Desktop report descriptor\n");
                rdesc[105] = rdesc[110] = 0x03;