libavcodec/escape124.c:304: error: Integer Overflow L2
  ([-1, +oo] - 1):unsigned32 by call to `decode_macroblock`.

libavcodec/escape124.c:228:19: Call
226. 
227.     frame_flags = bitstream_read(&bc, 32);
228.     frame_size  = bitstream_read(&bc, 32);
                       ^
229. 
230.     // Leave last frame unchanged

libavcodec/bitstream.h:183:1: Parameter `bc->bits_left`
  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/escape124.c:302:48: Call
300.                             old_frame_data, old_stride);
301. 
302.             while (can_safely_read(&bc, 1) && !bitstream_read_bit(&bc)) {
                                                    ^
303.                 unsigned mask;
304.                 mb = decode_macroblock(s, &bc, &cb_index, superblock_index);

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/escape124.c:304:22: Call
302.             while (can_safely_read(&bc, 1) && !bitstream_read_bit(&bc)) {
303.                 unsigned mask;
304.                 mb = decode_macroblock(s, &bc, &cb_index, superblock_index);
                          ^
305.                 mask = bitstream_read(&bc, 16);
306.                 multi_mask |= mask;

libavcodec/escape124.c:144:1: Parameter `bc->bits_left`
  142. }
  143. 
  144. static MacroBlock decode_macroblock(Escape124Context *s, BitstreamContext *bc,
       ^
  145.                                     int *codebook_index, int superblock_index)
  146. {

libavcodec/escape124.c:150:17: Call
  148.     // guard this function appropriately
  149.     unsigned block_index, depth;
  150.     int value = bitstream_read_bit(bc);
                       ^
  151.     if (value) {
  152.         static const char transitions[3][2] = { {2, 1}, {0, 2}, {1, 0} };

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/escape124.c:153:17: Call
  151.     if (value) {
  152.         static const char transitions[3][2] = { {2, 1}, {0, 2}, {1, 0} };
  153.         value = bitstream_read_bit(bc);
                       ^
  154.         *codebook_index = transitions[*codebook_index][value];
  155.     }

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: <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] - 1):unsigned32 by call to `decode_macroblock` 
      137.     bc->bits <<= n;
      138. #endif
      139.     bc->bits_left -= n;
               ^
      140. 
      141.     return ret;
