HID: hid-cypress: validate length of report

Make sure we have enough of a report structure to validate before
looking at it.

Reported-by: Benoit Camredon <[e-mail]>
Tested-by: Benoit Camredon <[e-mail]>
Cc: stable <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>
Signed-off-by: Jiri Kosina <[e-mail]>

drivers/hid/hid-cypress.c

···
 	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) {
 			rdesc[i] = 0x19;