Subject: [PATCH 2.6.32 04/12] HID: fix a couple of off-by-ones

From: Jiri Kosina <[email-masked]>
Date: Thu, 21 Aug 2014 09:57:48 -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 <[email-masked]>
Reviewed-by: Benjamin Tissoires <[email-masked]>
Signed-off-by: Jiri Kosina <[email-masked]>
[bwh: Backported to 2.6.32:
 - Adjust context
 - Drop change to a quirk in hid-lg.c that doesn't exist here]
Signed-off-by: Ben Hutchings <[email-masked]>
---
 drivers/hid/hid-cherry.c   | 2 +-
 drivers/hid/hid-kye.c      | 2 +-
 drivers/hid/hid-lg.c       | 2 +-
 drivers/hid/hid-monterey.c | 2 +-
 drivers/hid/hid-petalynx.c | 2 +-
 drivers/hid/hid-sunplus.c  | 2 +-
 6 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/hid/hid-cherry.c b/drivers/hid/hid-cherry.c
index 7e597d7..bfce74e 100644
--- a/drivers/hid/hid-cherry.c
+++ b/drivers/hid/hid-cherry.c
@@ -29,7 +29,7 @@
 static void 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) {
 		dev_info(&hdev->dev, "fixing up Cherry Cymotion report "
 				"descriptor\n");
 		rdesc[11] = rdesc[16] = 0xff;
diff --git a/drivers/hid/hid-kye.c b/drivers/hid/hid-kye.c
index f887171..30f723b 100644
--- a/drivers/hid/hid-kye.c
+++ b/drivers/hid/hid-kye.c
@@ -26,7 +26,7 @@
 static void kye_report_fixup(struct hid_device *hdev, __u8 *rdesc,
 		unsigned int rsize)
 {
-	if (rsize >= 74 &&
+	if (rsize >= 75 &&
 		rdesc[61] == 0x05 && rdesc[62] == 0x08 &&
 		rdesc[63] == 0x19 && rdesc[64] == 0x08 &&
 		rdesc[65] == 0x29 && rdesc[66] == 0x0f &&
diff --git a/drivers/hid/hid-lg.c b/drivers/hid/hid-lg.c
index 0f870a3..6d34374 100644
--- a/drivers/hid/hid-lg.c
+++ b/drivers/hid/hid-lg.c
@@ -44,7 +44,7 @@ static void lg_report_fixup(struct hid_device *hdev, __u8 *rdesc,
 {
 	unsigned long quirks = (unsigned long)hid_get_drvdata(hdev);
 
-	if ((quirks & LG_RDESC) && rsize >= 90 && rdesc[83] == 0x26 &&
+	if ((quirks & LG_RDESC) && rsize >= 91 && rdesc[83] == 0x26 &&
 			rdesc[84] == 0x8c && rdesc[85] == 0x02) {
 		dev_info(&hdev->dev, "fixing up Logitech keyboard report "
 				"descriptor\n");
diff --git a/drivers/hid/hid-monterey.c b/drivers/hid/hid-monterey.c
index 2cd05aa..eaa2ac8 100644
--- a/drivers/hid/hid-monterey.c
+++ b/drivers/hid/hid-monterey.c
@@ -25,7 +25,7 @@
 static void 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) {
 		dev_info(&hdev->dev, "fixing up button/consumer in HID report "
 				"descriptor\n");
 		rdesc[30] = 0x0c;
diff --git a/drivers/hid/hid-petalynx.c b/drivers/hid/hid-petalynx.c
index 500fbd0..38fa74d 100644
--- a/drivers/hid/hid-petalynx.c
+++ b/drivers/hid/hid-petalynx.c
@@ -26,7 +26,7 @@
 static void 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) {
 		dev_info(&hdev->dev, "fixing up Petalynx Maxter Remote report "
diff --git a/drivers/hid/hid-sunplus.c b/drivers/hid/hid-sunplus.c
index 438107d..ac0d488 100644
--- a/drivers/hid/hid-sunplus.c
+++ b/drivers/hid/hid-sunplus.c
@@ -25,7 +25,7 @@
 static void 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) {
 		dev_info(&hdev->dev, "fixing up Sunplus Wireless Desktop "
 				"report descriptor\n");