libavcodec/alsdec.c:625: error: Integer Overflow L2
  (32 - [-1+min(64, `ctx->bc.bits_left`), -1+max(64, `ctx->bc.bits_left`)]):unsigned32 by call to `bitstream_read`.

libavcodec/alsdec.c:596:1: Parameter `ctx->bc.bits_left`
594. /** Read the block data for a non-constant block
595.  */
596. static int read_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
     ^
597. {
598.     ALSSpecificConfig *sconf = &ctx->sconf;

libavcodec/alsdec.c:616:23: Call
614. 
615.     *bd->opt_order  = 1;
616.     bd->js_blocks   = bitstream_read_bit(bc);
                           ^
617. 
618.     opt_order       = *bd->opt_order;

libavcodec/bitstream.h:145:1: Parameter `bc->bits_left`
  143. 
  144. /* Return one bit from the buffer. */
  145. static inline unsigned bitstream_read_bit(BitstreamContext *bc)
       ^
  146. {
  147.     if (!bc->bits_left)

libavcodec/bitstream.h:150:12: Call
  148.         refill_64(bc);
  149. 
  150.     return get_val(bc, 1);
                  ^
  151. }
  152. 

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: Assignment
    137.     bc->bits <<= n;
    138. #endif
    139.     bc->bits_left -= n;
             ^
    140. 
    141.     return ret;

libavcodec/alsdec.c:625:31: Call
623.     } else {
624.         if (sconf->bgmc && sconf->sb_part)
625.             log2_sub_blocks = bitstream_read(bc, 2);
                                   ^
626.         else
627.             log2_sub_blocks = 2 * bitstream_read_bit(bc);

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 - [-1+min(64, ctx->bc.bits_left), -1+max(64, ctx->bc.bits_left)]):unsigned32 by call to `bitstream_read` 
    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;
