libavcodec/ralf.c:250: error: Integer Overflow L2
  ([1, +oo] - 4):unsigned32 by call to `extend_code`.

libavcodec/ralf.c:250:21: Call
248. 
249.     ctx->bias[ch] = bitstream_read_vlc(bc, set->bias.table, 9, 2);
250.     ctx->bias[ch] = extend_code(bc, ctx->bias[ch], 127, 4);
                         ^
251. 
252.     if (ctx->filter_params == FILTER_NONE) {

libavcodec/ralf.c:215:1: Parameter `bits`
  213. }
  214. 
  215. static inline int extend_code(BitstreamContext *bc, int val, int range, int bits)
       ^
  216. {
  217.     if (val == 0) {

libavcodec/ralf.c:225:31: Call
  223.     }
  224.     if (bits)
  225.         val = (val << bits) | bitstream_read(bc, bits);
                                     ^
  226.     return val;
  227. }

libavcodec/bitstream.h:183:1: Parameter `n`
    181. 
    182. /* Return n bits from the buffer. n has to be in the 0-32 range. */
    183. static inline uint32_t bitstream_read(BitstreamContext *bc, unsigned n)
         ^
    184. {
    185.     if (!n)

libavcodec/bitstream.h:194:12: Call
    192.     }
    193. 
    194.     return get_val(bc, n);
                    ^
    195. }
    196. 

libavcodec/bitstream.h:130:1: <LHS trace>
128. }
129. 
130. static inline uint64_t get_val(BitstreamContext *bc, unsigned n)
     ^
131. {
132. #ifdef BITSTREAM_READER_LE

libavcodec/bitstream.h:130:1: Parameter `bc->bits_left`
      128. }
      129. 
      130. static inline uint64_t get_val(BitstreamContext *bc, unsigned n)
           ^
      131. {
      132. #ifdef BITSTREAM_READER_LE

libavcodec/bitstream.h:130:1: <RHS trace>
128. }
129. 
130. static inline uint64_t get_val(BitstreamContext *bc, unsigned n)
     ^
131. {
132. #ifdef BITSTREAM_READER_LE

libavcodec/bitstream.h:130:1: Parameter `n`
      128. }
      129. 
      130. static inline uint64_t get_val(BitstreamContext *bc, unsigned n)
           ^
      131. {
      132. #ifdef BITSTREAM_READER_LE

libavcodec/bitstream.h:139:5: Binary operation: ([1, +oo] - 4):unsigned32 by call to `extend_code` 
      137.     bc->bits <<= n;
      138. #endif
      139.     bc->bits_left -= n;
               ^
      140. 
      141.     return ret;
