HID: hid-cypress: validate length of report

[pandora-kernel.git] / drivers / hid / hid-cypress.c

diff --git a/drivers/hid/hid-cypress.c b/drivers/hid/hid-cypress.c
index 9e43aac..d6cae26 100644 (file)
--- a/drivers/hid/hid-cypress.c
+++ b/drivers/hid/hid-cypress.c
@@ -40,6 +40,9 @@ static __u8 *cp_report_fixup(struct hid_device *hdev, __u8 *rdesc,
        if (!(quirks & CP_RDESC_SWAPPED_MIN_MAX))
                return rdesc;
 
+       if (*rsize < 4)
+               return rdesc;
+
        for (i = 0; i < *rsize - 4; i++)
                if (rdesc[i] == 0x29 && rdesc[i + 2] == 0x19) {
                        __u8 tmp;