libavcodec/amrnbdec.c:1026: error: Buffer Overrun L2
  Offset: [0, 12] (⇐ [0, 3] + [0, 9]) Size: [4, 10] by call to `fixed_gain_smooth`.

libavcodec/amrnbdec.c:981:10: Assignment
979.         ff_acelp_lspd2lpc(p->lsp[i], p->lpc[i], 5);
980. 
981.     for (subframe = 0; subframe < 4; subframe++) {
              ^
982.         const AMRNBSubframe *amr_subframe = &p->frame.subframe[subframe];
983. 

libavcodec/amrnbdec.c:1026:28: Call
1024.         // The specification is ambiguous, but in the reference source, the
1025.         // smoothed value is NOT fed back into later fixed gain smoothing.
1026.         synth_fixed_gain = fixed_gain_smooth(p, p->lsf_q[subframe],
                                 ^
1027.                                              p->lsf_avg, p->cur_frame_mode);
1028. 

libavcodec/amrnbdec.c:599:10: <Offset trace>
597.     int i;
598. 
599.     for (i = 0; i < LP_FILTER_ORDER; i++)
              ^
600.         diff += fabs(lsf_avg[i] - lsf[i]) / lsf_avg[i];
601. 

libavcodec/amrnbdec.c:599:10: Assignment
  597.     int i;
  598. 
  599.     for (i = 0; i < LP_FILTER_ORDER; i++)
                ^
  600.         diff += fabs(lsf_avg[i] - lsf[i]) / lsf_avg[i];
  601. 

libavcodec/amrnbdec.c:593:1: <Length trace>
591.  * @return fixed gain smoothed
592.  */
593. static float fixed_gain_smooth(AMRContext *p , const float *lsf,
     ^
594.                                const float *lsf_avg, const enum Mode mode)
595. {

libavcodec/amrnbdec.c:593:1: Parameter `*lsf`
  591.  * @return fixed gain smoothed
  592.  */
  593. static float fixed_gain_smooth(AMRContext *p , const float *lsf,
       ^
  594.                                const float *lsf_avg, const enum Mode mode)
  595. {

libavcodec/amrnbdec.c:600:35: Array access: Offset: [0, 12] (⇐ [0, 3] + [0, 9]) Size: [4, 10] by call to `fixed_gain_smooth` 
  598. 
  599.     for (i = 0; i < LP_FILTER_ORDER; i++)
  600.         diff += fabs(lsf_avg[i] - lsf[i]) / lsf_avg[i];
                                         ^
  601. 
  602.     // If diff is large for ten subframes, disable smoothing for a 40-subframe
