libavutil/dict.c:105: error: Null Dereference
  pointer `m->elems` last assigned on line 94 could be null and is dereferenced at line 105, column 13.

libavutil/dict.c:68:1: start of procedure av_dict_set()
66. }
67. 
68. int av_dict_set(AVDictionary **pm, const char *key, const char *value,
    ^
69.                 int flags)
70. {

libavutil/dict.c:71:5: 
69.                 int flags)
70. {
71.     AVDictionary *m = *pm;
        ^
72.     AVDictionaryEntry *tag = av_dict_get(m, key, NULL, flags);
73.     char *oldval = NULL;

libavutil/dict.c:72:5: Skipping av_dict_get(): empty list of specs
70. {
71.     AVDictionary *m = *pm;
72.     AVDictionaryEntry *tag = av_dict_get(m, key, NULL, flags);
        ^
73.     char *oldval = NULL;
74.     int allocated = !!m;

libavutil/dict.c:73:5: 
71.     AVDictionary *m = *pm;
72.     AVDictionaryEntry *tag = av_dict_get(m, key, NULL, flags);
73.     char *oldval = NULL;
        ^
74.     int allocated = !!m;
75. 

libavutil/dict.c:74:23: Condition is false
72.     AVDictionaryEntry *tag = av_dict_get(m, key, NULL, flags);
73.     char *oldval = NULL;
74.     int allocated = !!m;
                          ^
75. 
76.     if (!m)

libavutil/dict.c:74:21: 
72.     AVDictionaryEntry *tag = av_dict_get(m, key, NULL, flags);
73.     char *oldval = NULL;
74.     int allocated = !!m;
                        ^
75. 
76.     if (!m)

libavutil/dict.c:74:5: 
72.     AVDictionaryEntry *tag = av_dict_get(m, key, NULL, flags);
73.     char *oldval = NULL;
74.     int allocated = !!m;
        ^
75. 
76.     if (!m)

libavutil/dict.c:76:10: Taking false branch
74.     int allocated = !!m;
75. 
76.     if (!m)
             ^
77.         m = *pm = av_mallocz(sizeof(*m));
78.     if (!m)

libavutil/dict.c:78:10: Taking false branch
76.     if (!m)
77.         m = *pm = av_mallocz(sizeof(*m));
78.     if (!m)
             ^
79.         return AVERROR(ENOMEM);
80. 

libavutil/dict.c:81:9: Taking false branch
79.         return AVERROR(ENOMEM);
80. 
81.     if (tag) {
            ^
82.         if (flags & AV_DICT_DONT_OVERWRITE) {
83.             if (flags & AV_DICT_DONT_STRDUP_KEY) av_free(key);

libavutil/dict.c:94:9: 
92.         *tag = m->elems[--m->count];
93.     } else {
94.         int ret = av_reallocp_array(&m->elems,
            ^
95.                                     m->count + 1, sizeof(*m->elems));
96.         if (ret < 0) {

libavutil/mem.c:167:1: start of procedure av_reallocp_array()
  165. }
  166. 
  167. int av_reallocp_array(void *ptr, size_t nmemb, size_t size)
       ^
  168. {
  169.     void **ptrptr = ptr;

libavutil/mem.c:169:5: 
  167. int av_reallocp_array(void *ptr, size_t nmemb, size_t size)
  168. {
  169.     void **ptrptr = ptr;
           ^
  170.     void *ret;
  171.     if (!size || nmemb >= INT_MAX / size)

libavutil/mem.c:171:10: Taking false branch
  169.     void **ptrptr = ptr;
  170.     void *ret;
  171.     if (!size || nmemb >= INT_MAX / size)
                ^
  172.         return AVERROR(ENOMEM);
  173.     if (!nmemb) {

libavutil/mem.c:171:18: Taking false branch
  169.     void **ptrptr = ptr;
  170.     void *ret;
  171.     if (!size || nmemb >= INT_MAX / size)
                        ^
  172.         return AVERROR(ENOMEM);
  173.     if (!nmemb) {

libavutil/mem.c:173:10: Taking true branch
  171.     if (!size || nmemb >= INT_MAX / size)
  172.         return AVERROR(ENOMEM);
  173.     if (!nmemb) {
                ^
  174.         av_freep(ptr);
  175.         return 0;

libavutil/mem.c:174:9: 
  172.         return AVERROR(ENOMEM);
  173.     if (!nmemb) {
  174.         av_freep(ptr);
               ^
  175.         return 0;
  176.     }

libavutil/mem.c:198:1: start of procedure av_freep()
    196. }
    197. 
    198. void av_freep(void *arg)
         ^
    199. {
    200.     void **ptr = (void **)arg;

libavutil/mem.c:200:5: 
    198. void av_freep(void *arg)
    199. {
    200.     void **ptr = (void **)arg;
             ^
    201.     av_free(*ptr);
    202.     *ptr = NULL;

libavutil/mem.c:201:5: 
    199. {
    200.     void **ptr = (void **)arg;
    201.     av_free(*ptr);
             ^
    202.     *ptr = NULL;
    203. }

libavutil/mem.c:186:1: start of procedure av_free()
      184. }
      185. 
      186. void av_free(void *ptr)
           ^
      187. {
      188. #if CONFIG_MEMALIGN_HACK

libavutil/mem.c:194:5: 
      192.     _aligned_free(ptr);
      193. #else
      194.     free(ptr);
               ^
      195. #endif
      196. }

libavutil/mem.c:196:1: return from a call to av_free
      194.     free(ptr);
      195. #endif
      196. }
           ^
      197. 
      198. void av_freep(void *arg)

libavutil/mem.c:202:5: 
    200.     void **ptr = (void **)arg;
    201.     av_free(*ptr);
    202.     *ptr = NULL;
             ^
    203. }
    204. 

libavutil/mem.c:203:1: return from a call to av_freep
    201.     av_free(*ptr);
    202.     *ptr = NULL;
    203. }
         ^
    204. 
    205. void *av_mallocz(size_t size)

libavutil/mem.c:175:9: 
  173.     if (!nmemb) {
  174.         av_freep(ptr);
  175.         return 0;
               ^
  176.     }
  177.     ret = av_realloc(*ptrptr, nmemb * size);

libavutil/mem.c:184:1: return from a call to av_reallocp_array
  182.     *ptrptr = ret;
  183.     return 0;
  184. }
       ^
  185. 
  186. void av_free(void *ptr)

libavutil/dict.c:96:13: Taking false branch
94.         int ret = av_reallocp_array(&m->elems,
95.                                     m->count + 1, sizeof(*m->elems));
96.         if (ret < 0) {
                ^
97.             if (allocated)
98.                 av_freep(pm);

libavutil/dict.c:103:9: Taking true branch
101.         }
102.     }
103.     if (value) {
             ^
104.         if (flags & AV_DICT_DONT_STRDUP_KEY)
105.             m->elems[m->count].key = key;

libavutil/dict.c:104:13: Taking true branch
102.     }
103.     if (value) {
104.         if (flags & AV_DICT_DONT_STRDUP_KEY)
                 ^
105.             m->elems[m->count].key = key;
106.         else

libavutil/dict.c:105:13: 
103.     if (value) {
104.         if (flags & AV_DICT_DONT_STRDUP_KEY)
105.             m->elems[m->count].key = key;
                 ^
106.         else
107.             m->elems[m->count].key = av_strdup(key);
