ASoC: correct read size return value for erroneous conditions

Wrong return value of in_read() causes integer overflow in omx,
which aborts the process. Correct the return value for erroneous
conditions.

CRs-Fixed: 2336645
Change-Id: Ib01827adc92700876f3b11816857f0086b1b5f94
Signed-off-by: Weiyin Jiang <[email protected]>

dsp/codecs/audio_utils.c

@@ -1,4 +1,4 @@
-/* Copyright (c) 2010-2017, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2010-2018, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
@@ -760,6 +760,10 @@ ssize_t audio_in_read(struct file *file,
 				}
 				bytes_to_copy =
 					(size + audio->out_frame_info[idx][1]);
+				if (bytes_to_copy == 0) {
+					rc = 0;
+					break;
+				}
 				/* Number of frames information copied */
 				buf += sizeof(unsigned char);
 				count -= sizeof(unsigned char);
@@ -793,8 +797,10 @@ ssize_t audio_in_read(struct file *file,
 
 	pr_debug("%s:session id %d: read: %zd bytes\n", __func__,
 			audio->ac->session, (buf-start));
-	if (buf > start)
-		return buf - start;
+	if (!rc) {
+		if (buf > start)
+			return buf - start;
+	}
 	return rc;
 }