libavformat/matroskaenc.c:391: error: Null Dereference
  pointer `cues->entries` last assigned on line 385 could be null and is dereferenced at line 391, column 5.

libavformat/matroskaenc.c:378:1: start of procedure mkv_add_cuepoint()
376. }
377. 
378. static int mkv_add_cuepoint(mkv_cues *cues, int stream, int64_t ts, int64_t cluster_pos)
     ^
379. {
380.     int err;

libavformat/matroskaenc.c:382:9: Taking false branch
380.     int err;
381. 
382.     if (ts < 0)
             ^
383.         return 0;
384. 

libavformat/matroskaenc.c:385:9: 
383.         return 0;
384. 
385.     if ((err = av_reallocp_array(&cues->entries, cues->num_entries + 1,
             ^
386.                                  sizeof(*cues->entries))) < 0) {
387.         cues->num_entries = 0;

libavutil/mem.c:146:1: start of procedure av_reallocp_array()
  144. }
  145. 
  146. int av_reallocp_array(void *ptr, size_t nmemb, size_t size)
       ^
  147. {
  148.     void **ptrptr = ptr;

libavutil/mem.c:148:5: 
  146. int av_reallocp_array(void *ptr, size_t nmemb, size_t size)
  147. {
  148.     void **ptrptr = ptr;
           ^
  149.     void *ret;
  150.     if (!size || nmemb >= INT_MAX / size)

libavutil/mem.c:150:10: Taking false branch
  148.     void **ptrptr = ptr;
  149.     void *ret;
  150.     if (!size || nmemb >= INT_MAX / size)
                ^
  151.         return AVERROR(ENOMEM);
  152.     if (!nmemb) {

libavutil/mem.c:150:18: Taking false branch
  148.     void **ptrptr = ptr;
  149.     void *ret;
  150.     if (!size || nmemb >= INT_MAX / size)
                        ^
  151.         return AVERROR(ENOMEM);
  152.     if (!nmemb) {

libavutil/mem.c:152:10: Taking true branch
  150.     if (!size || nmemb >= INT_MAX / size)
  151.         return AVERROR(ENOMEM);
  152.     if (!nmemb) {
                ^
  153.         av_freep(ptr);
  154.         return 0;

libavutil/mem.c:153:9: 
  151.         return AVERROR(ENOMEM);
  152.     if (!nmemb) {
  153.         av_freep(ptr);
               ^
  154.         return 0;
  155.     }

libavutil/mem.c:177:1: start of procedure av_freep()
    175. }
    176. 
    177. void av_freep(void *arg)
         ^
    178. {
    179.     void **ptr = (void **)arg;

libavutil/mem.c:179:5: 
    177. void av_freep(void *arg)
    178. {
    179.     void **ptr = (void **)arg;
             ^
    180.     av_free(*ptr);
    181.     *ptr = NULL;

libavutil/mem.c:180:5: 
    178. {
    179.     void **ptr = (void **)arg;
    180.     av_free(*ptr);
             ^
    181.     *ptr = NULL;
    182. }

libavutil/mem.c:165:1: start of procedure av_free()
      163. }
      164. 
      165. void av_free(void *ptr)
           ^
      166. {
      167. #if CONFIG_MEMALIGN_HACK

libavutil/mem.c:173:5: 
      171.     _aligned_free(ptr);
      172. #else
      173.     free(ptr);
               ^
      174. #endif
      175. }

libavutil/mem.c:175:1: return from a call to av_free
      173.     free(ptr);
      174. #endif
      175. }
           ^
      176. 
      177. void av_freep(void *arg)

libavutil/mem.c:181:5: 
    179.     void **ptr = (void **)arg;
    180.     av_free(*ptr);
    181.     *ptr = NULL;
             ^
    182. }
    183. 

libavutil/mem.c:182:1: return from a call to av_freep
    180.     av_free(*ptr);
    181.     *ptr = NULL;
    182. }
         ^
    183. 
    184. void *av_mallocz(size_t size)

libavutil/mem.c:154:9: 
  152.     if (!nmemb) {
  153.         av_freep(ptr);
  154.         return 0;
               ^
  155.     }
  156.     ret = av_realloc(*ptrptr, nmemb * size);

libavutil/mem.c:163:1: return from a call to av_reallocp_array
  161.     *ptrptr = ret;
  162.     return 0;
  163. }
       ^
  164. 
  165. void av_free(void *ptr)

libavformat/matroskaenc.c:385:9: Taking false branch
383.         return 0;
384. 
385.     if ((err = av_reallocp_array(&cues->entries, cues->num_entries + 1,
             ^
386.                                  sizeof(*cues->entries))) < 0) {
387.         cues->num_entries = 0;

libavformat/matroskaenc.c:391:5: 
389.     }
390. 
391.     cues->entries[cues->num_entries].pts           = ts;
         ^
392.     cues->entries[cues->num_entries].tracknum      = stream + 1;
393.     cues->entries[cues->num_entries++].cluster_pos = cluster_pos - cues->segment_offset;
