s390/dcss: array index 'i' is used before limits check.

Avoid out-of-bounds-read by checking count before indexing.

Signed-off-by : Ameen Ali <[e-mail]>
Reviewed-by: Kees Cook <[e-mail]>
Signed-off-by: Heiko Carstens <[e-mail]>
Signed-off-by: Martin Schwidefsky <[e-mail]>

drivers/s390/block/dcssblk.c

···
 	 * parse input
 	 */
 	num_of_segments = 0;
-	for (i = 0; ((buf[i] != '\0') && (buf[i] != '\n') && i < count); i++) {
+	for (i = 0; (i < count && (buf[i] != '\0') && (buf[i] != '\n')); i++) {
 		for (j = i; (buf[j] != ':') &&
 			(buf[j] != '\0') &&
 			(buf[j] != '\n') &&