libavcodec/sipr16k.c:111: error: Buffer Overrun L3
  Offset: [-1, +oo] (⇐ [16, +oo] + [-17, -6]) Size: 46 by call to `ff_celp_lp_synthesis_filterf`.

libavcodec/sipr16k.c:97:1: Array declaration
95. }
96. 
97. static void postfilter(float *out_data, float* synth, float* iir_mem,
    ^
98.                        float* filt_mem[2], float* mem_preemph)
99. {

libavcodec/sipr16k.c:101:5: Assignment
 99. {
100.     float buf[30 + LP_FILTER_ORDER_16k];
101.     float *tmpbuf = buf + LP_FILTER_ORDER_16k;
         ^
102.     float s;
103.     int i;

libavcodec/sipr16k.c:111:5: Call
109.            LP_FILTER_ORDER_16k*sizeof(*buf));
110. 
111.     ff_celp_lp_synthesis_filterf(tmpbuf, filt_mem[1], synth, 30,
         ^
112.                                  LP_FILTER_ORDER_16k);
113. 

libavcodec/celp_filters.c:83:1: <Offset trace>
81. }
82. 
83. void ff_celp_lp_synthesis_filterf(float *out, const float *filter_coeffs,
    ^
84.                                   const float* in, int buffer_length,
85.                                   int filter_length)

libavcodec/celp_filters.c:83:1: Parameter `filter_length`
  81. }
  82. 
  83. void ff_celp_lp_synthesis_filterf(float *out, const float *filter_coeffs,
      ^
  84.                                   const float* in, int buffer_length,
  85.                                   int filter_length)

libavcodec/celp_filters.c:83:1: <Length trace>
81. }
82. 
83. void ff_celp_lp_synthesis_filterf(float *out, const float *filter_coeffs,
    ^
84.                                   const float* in, int buffer_length,
85.                                   int filter_length)

libavcodec/celp_filters.c:83:1: Parameter `*out`
  81. }
  82. 
  83. void ff_celp_lp_synthesis_filterf(float *out, const float *filter_coeffs,
      ^
  84.                                   const float* in, int buffer_length,
  85.                                   int filter_length)

libavcodec/celp_filters.c:146:24: Array access: Offset: [-1, +oo] (⇐ [16, +oo] + [-17, -6]) Size: 46 by call to `ff_celp_lp_synthesis_filterf` 
  144.             out3 -= val * old_out2;
  145. 
  146.             old_out2 = out[-i-1];
                              ^
  147. 
  148.             val = filter_coeffs[i];
