libavcodec/flac.c:63: error: Integer Overflow L2
  ([0, +oo] - 1):unsigned32 by call to `bitstream_read_bit`.

libavcodec/flac.c:57:10: Call
55. 
56.     /* frame sync code */
57.     if ((bitstream_read(bc, 15) & 0x7FFF) != 0x7FFC) {
             ^
58.         av_log(avctx, AV_LOG_ERROR + log_level_offset, "invalid sync code\n");
59.         return AVERROR_INVALIDDATA;

libavcodec/bitstream.h:182:1: Parameter `bc->bits_left`
  180. 
  181. /* Return n bits from the buffer. n has to be in the 0-32 range. */
  182. static inline uint32_t bitstream_read(BitstreamContext *bc, unsigned n)
       ^
  183. {
  184.     if (!n)

libavcodec/flac.c:63:23: Call
61. 
62.     /* variable block size stream code */
63.     fi->is_var_size = bitstream_read_bit(bc);
                          ^
64. 
65.     /* block size and sample rate codes */

libavcodec/bitstream.h:144:1: Parameter `bc->bits_left`
  142. 
  143. /* Return one bit from the buffer. */
  144. static inline unsigned bitstream_read_bit(BitstreamContext *bc)
       ^
  145. {
  146.     if (!bc->bits_left)

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

libavcodec/bitstream.h:129:1: <LHS trace>
127. }
128. 
129. static inline uint64_t get_val(BitstreamContext *bc, unsigned n)
     ^
130. {
131. #ifdef BITSTREAM_READER_LE

libavcodec/bitstream.h:129:1: Parameter `bc->bits_left`
    127. }
    128. 
    129. static inline uint64_t get_val(BitstreamContext *bc, unsigned n)
         ^
    130. {
    131. #ifdef BITSTREAM_READER_LE

libavcodec/bitstream.h:129:1: <RHS trace>
127. }
128. 
129. static inline uint64_t get_val(BitstreamContext *bc, unsigned n)
     ^
130. {
131. #ifdef BITSTREAM_READER_LE

libavcodec/bitstream.h:129:1: Parameter `n`
    127. }
    128. 
    129. static inline uint64_t get_val(BitstreamContext *bc, unsigned n)
         ^
    130. {
    131. #ifdef BITSTREAM_READER_LE

libavcodec/bitstream.h:138:5: Binary operation: ([0, +oo] - 1):unsigned32 by call to `bitstream_read_bit` 
    136.     bc->bits <<= n;
    137. #endif
    138.     bc->bits_left -= n;
             ^
    139. 
    140.     return ret;
