sbc: Fix stack overflow read in sbc_crc8.
When encoding or decoding with JOINT_STEREO and 8 subbands the crc_pos is 88
bits. In this case there are no extra bits which need to be added to the CRC,
but there is still a read 1 byte past the end of the crc_header stack variable.
diff --git a/sbc/sbc.c b/sbc/sbc.c
index 606f11c..7f1efaa 100644
--- a/sbc/sbc.c
+++ b/sbc/sbc.c
@@ -190,7 +190,7 @@
for (i = 0; i < len / 8; i++)
crc = crc_table[crc ^ data[i]];
- octet = data[i];
+ octet = len % 8 ? data[i] : 0;
for (i = 0; i < len % 8; i++) {
char bit = ((octet ^ crc) & 0x80) >> 7;
