avcodec/sonic: Check for overread

Fixes: Timeout (too long -> 1.3 sec)
Fixes: 24358/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SONIC_fuzzer-5107284099989504

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/sonic.c

@@ -1031,6 +1031,9 @@ static int sonic_decode_frame(AVCodecContext *avctx,
     {
         int x = ch;
 
+        if (c.overread > MAX_OVERREAD)
+            return AVERROR_INVALIDDATA;
+
         predictor_init_state(s->predictor_k, s->predictor_state[ch], s->num_taps);
 
         intlist_read(&c, state, s->coded_samples[ch], s->block_align, 1);