libavcodec/4xm.c:500: error: Integer Overflow L2
  ([0, +oo] - 9):unsigned32 by call to `bitstream_read_vlc`.

libavcodec/4xm.c:483:1: Parameter `(*f->pre_vlc.table)[*]`
481.  * Note this is almost identical to MJPEG.
482.  */
483. static int decode_i_block(FourXContext *f, int16_t *block)
     ^
484. {
485.     int code, i, j, level, val;

libavcodec/4xm.c:488:11: Call
486. 
487.     /* DC coef */
488.     val = bitstream_read_vlc(&f->pre_bc, f->pre_vlc.table, ACDC_VLC_BITS, 3);
               ^
489.     if (val >> 4)
490.         av_log(f->avctx, AV_LOG_ERROR, "error dc run != 0\n");

libavcodec/bitstream.h:313:1: Parameter `(*table)[*]`
  311.  * If the VLC code is invalid and max_depth > 1, then the number of bits removed
  312.  * is undefined. */
  313. static inline int bitstream_read_vlc(BitstreamContext *bc, VLC_TYPE (*table)[2],
       ^
  314.                                      int bits, int max_depth)
  315. {

libavcodec/bitstream.h:319:5: Assignment
  317.     unsigned idx = bitstream_peek(bc, bits);
  318.     int code = table[idx][0];
  319.     int n    = table[idx][1];
           ^
  320. 
  321.     if (max_depth > 1 && n < 0) {

libavcodec/bitstream.h:329:5: Call
  327.         }
  328.     }
  329.     skip_remaining(bc, n);
           ^
  330. 
  331.     return code;

libavcodec/bitstream.h:230:1: Parameter `n`
    228. }
    229. 
    230. static inline void skip_remaining(BitstreamContext *bc, unsigned n)
         ^
    231. {
    232. #ifdef BITSTREAM_READER_LE

libavcodec/bitstream.h:237:5: Assignment
    235.     bc->bits <<= n;
    236. #endif
    237.     bc->bits_left -= n;
             ^
    238. }
    239. 

libavcodec/4xm.c:500:16: Call
498.     i = 1;
499.     for (;;) {
500.         code = bitstream_read_vlc(&f->pre_bc, f->pre_vlc.table, ACDC_VLC_BITS, 3);
                    ^
501. 
502.         /* EOB */

libavcodec/bitstream.h:313:1: Parameter `bits`
  311.  * If the VLC code is invalid and max_depth > 1, then the number of bits removed
  312.  * is undefined. */
  313. static inline int bitstream_read_vlc(BitstreamContext *bc, VLC_TYPE (*table)[2],
       ^
  314.                                      int bits, int max_depth)
  315. {

libavcodec/bitstream.h:322:9: Call
  320. 
  321.     if (max_depth > 1 && n < 0) {
  322.         skip_remaining(bc, bits);
               ^
  323.         code = set_idx(bc, code, &n, &nb_bits, table);
  324.         if (max_depth > 2 && n < 0) {

libavcodec/bitstream.h:230:1: <LHS trace>
228. }
229. 
230. static inline void skip_remaining(BitstreamContext *bc, unsigned n)
     ^
231. {
232. #ifdef BITSTREAM_READER_LE

libavcodec/bitstream.h:230:1: Parameter `bc->bits_left`
    228. }
    229. 
    230. static inline void skip_remaining(BitstreamContext *bc, unsigned n)
         ^
    231. {
    232. #ifdef BITSTREAM_READER_LE

libavcodec/bitstream.h:230:1: <RHS trace>
228. }
229. 
230. static inline void skip_remaining(BitstreamContext *bc, unsigned n)
     ^
231. {
232. #ifdef BITSTREAM_READER_LE

libavcodec/bitstream.h:230:1: Parameter `n`
    228. }
    229. 
    230. static inline void skip_remaining(BitstreamContext *bc, unsigned n)
         ^
    231. {
    232. #ifdef BITSTREAM_READER_LE

libavcodec/bitstream.h:237:5: Binary operation: ([0, +oo] - 9):unsigned32 by call to `bitstream_read_vlc` 
    235.     bc->bits <<= n;
    236. #endif
    237.     bc->bits_left -= n;
             ^
    238. }
    239. 
