fraps: check for overread

Fixeds Ticket619
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/fraps.c

@@ -114,6 +114,8 @@ static int fraps2_decode_plane(FrapsContext *s, uint8_t *dst, int stride, int w,
             else if(Uoff) dst[i] += 0x80;
         }
         dst += stride;
+        if(get_bits_left(&gb) < 0)
+            return -1;
     }
     free_vlc(&vlc);
     return 0;

tests/ref/fate/fraps-v5

@@ -56,4 +56,3 @@
 0, 165000, 145152, 0x80448031
 0, 168000, 145152, 0xe3b1fbf7
 0, 171000, 145152, 0xa00395a4
-0, 174000, 145152, 0xdf3b4fce