libavcodec/imc.c:1023: error: Integer Overflow L2
  (32 - [0, 64]):unsigned32 by call to `imc_decode_block`.

libavcodec/imc.c:1019:9: Call
1017.         q->bdsp.bswap16_buf(buf16, (const uint16_t *) buf, IMC_BLOCK_SIZE / 2);
1018. 
1019.         bitstream_init(&q->bc, (const uint8_t*)buf16, IMC_BLOCK_SIZE * 8);
              ^
1020. 
1021.         buf += IMC_BLOCK_SIZE;

libavcodec/bitstream.h:85:9: Assignment
  83.         bc->buffer    =
  84.         bc->ptr       = NULL;
  85.         bc->bits_left = 0;
              ^
  86.         return AVERROR_INVALIDDATA;
  87.     }

libavcodec/imc.c:1023:20: Call
1021.         buf += IMC_BLOCK_SIZE;
1022. 
1023.         if ((ret = imc_decode_block(avctx, q, i)) < 0)
                         ^
1024.             return ret;
1025.     }

libavcodec/imc.c:844:1: Parameter `q->bc.bits_left`
  842. }
  843. 
  844. static int imc_decode_block(AVCodecContext *avctx, IMCContext *q, int ch)
       ^
  845. {
  846.     int stream_format_code;

libavcodec/imc.c:855:15: Call
  853. 
  854.     /* Check the frame header */
  855.     imc_hdr = bitstream_read(&q->bc, 9);
                     ^
  856.     if (imc_hdr & 0x18) {
  857.         av_log(avctx, AV_LOG_ERROR, "frame header check failed!\n");

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:189:9: Call
    187. 
    188.     if (n > bc->bits_left) {
    189.         refill_32(bc);
                 ^
    190.         if (bc->bits_left < 32)
    191.             bc->bits_left = n;

libavcodec/bitstream.h:60:1: <RHS trace>
58. }
59. 
60. static inline void refill_32(BitstreamContext *bc)
    ^
61. {
62.     if (bc->ptr >= bc->buffer_end)

libavcodec/bitstream.h:60:1: Parameter `bc->bits_left`
      58. }
      59. 
      60. static inline void refill_32(BitstreamContext *bc)
          ^
      61. {
      62.     if (bc->ptr >= bc->buffer_end)

libavcodec/bitstream.h:68:5: Binary operation: (32 - [0, 64]):unsigned32 by call to `imc_decode_block` 
      66.     bc->bits       = (uint64_t)AV_RL32(bc->ptr) << bc->bits_left | bc->bits;
      67. #else
      68.     bc->bits       = bc->bits | (uint64_t)AV_RB32(bc->ptr) << (32 - bc->bits_left);
              ^
      69. #endif
      70.     bc->ptr       += 4;
