diff options
| -rw-r--r-- | libhb/stream.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/libhb/stream.c b/libhb/stream.c index 2bd0e2573..69ba920f7 100644 --- a/libhb/stream.c +++ b/libhb/stream.c @@ -464,11 +464,31 @@ static int check_ps_sc(const uint8_t *buf) int mark = buf[4] >> 4; if ( mark == 0x02 ) { + // Check other marker bits to make it less likely + // that we are being spoofed. + if( ( buf[4] & 0xf1 ) != 0x21 || + ( buf[6] & 0x01 ) != 0x01 || + ( buf[8] & 0x01 ) != 0x01 || + ( buf[9] & 0x80 ) != 0x80 || + ( buf[11] & 0x01 ) != 0x01 ) + { + return 0; + } // mpeg-1 pack header pos = 12; // skip over the PACK } else { + // Check other marker bits to make it less likely + // that we are being spoofed. + if( ( buf[4] & 0xC4 ) != 0x44 || + ( buf[6] & 0x04 ) != 0x04 || + ( buf[8] & 0x04 ) != 0x04 || + ( buf[9] & 0x01 ) != 0x01 || + ( buf[12] & 0x03 ) != 0x03 ) + { + return 0; + } // mpeg-2 pack header pos = 14 + ( buf[13] & 0x7 ); // skip over the PACK } |