USB: Gadget: fix UTF conversion in the usbstring library

This patch (as1234) fixes a bug in the UTF8 -> UTF-16 conversion
routine in the gadget/usbstring library.  In a UTF-8 multi-byte
sequence, all bytes after the first should have their high-order
two bits set to 10, not 11.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/gadget/usbstring.c b/drivers/usb/gadget/usbstring.c
index 4154be3..58c4d37 100644 (file)
--- a/drivers/usb/gadget/usbstring.c
+++ b/drivers/usb/gadget/usbstring.c
@@ -38,7 +38,7 @@ static int utf8_to_utf16le(const char *s, __le16 *cp, unsigned len)
                                uchar = (c & 0x1f) << 6;
 
                                c = (u8) *s++;
-                               if ((c & 0xc0) != 0xc0)
+                               if ((c & 0xc0) != 0x80)
                                        goto fail;
                                c &= 0x3f;
                                uchar |= c;
@@ -49,13 +49,13 @@ static int utf8_to_utf16le(const char *s, __le16 *cp, unsigned len)
                                uchar = (c & 0x0f) << 12;
 
                                c = (u8) *s++;
-                               if ((c & 0xc0) != 0xc0)
+                               if ((c & 0xc0) != 0x80)
                                        goto fail;
                                c &= 0x3f;
                                uchar |= c << 6;
 
                                c = (u8) *s++;
-                               if ((c & 0xc0) != 0xc0)
+                               if ((c & 0xc0) != 0x80)
                                        goto fail;
                                c &= 0x3f;
                                uchar |= c;