avformat/mp3dec: Check that the frame fits within the probe buffer

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit e9a335150a)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavformat/mp3dec.c

@@ -89,7 +89,7 @@ static int mp3_read_probe(AVProbeData *p)
 
             header = AV_RB32(buf2);
             ret = avpriv_mpegaudio_decode_header(&h, header);
-            if (ret != 0)
+            if (ret != 0 || end - buf2 < h.frame_size)
                 break;
             buf2 += h.frame_size;
         }