libavformat/assdec.c:159: error: Null Dereference
  pointer `pkt->data` last assigned on line 155 could be null and is dereferenced by call to `memcpy()` at line 159, column 5.

libavformat/assdec.c:144:1: start of procedure read_packet()
142. }
143. 
144. static int read_packet(AVFormatContext *s, AVPacket *pkt)
     ^
145. {
146.     ASSContext *ass = s->priv_data;

libavformat/assdec.c:146:5: 
144. static int read_packet(AVFormatContext *s, AVPacket *pkt)
145. {
146.     ASSContext *ass = s->priv_data;
         ^
147.     uint8_t *p, *end;
148. 

libavformat/assdec.c:149:8: Taking false branch
147.     uint8_t *p, *end;
148. 
149.     if(ass->event_index >= ass->event_count)
            ^
150.         return AVERROR(EIO);
151. 

libavformat/assdec.c:152:5: 
150.         return AVERROR(EIO);
151. 
152.     p= ass->event[ ass->event_index ];
         ^
153. 
154.     end= strchr(p, '\n');

libavformat/assdec.c:154:5: 
152.     p= ass->event[ ass->event_index ];
153. 
154.     end= strchr(p, '\n');
         ^
155.     av_new_packet(pkt, end ? end-p+1 : strlen(p));
156.     pkt->flags |= AV_PKT_FLAG_KEY;

libavformat/assdec.c:155:24: Condition is true
153. 
154.     end= strchr(p, '\n');
155.     av_new_packet(pkt, end ? end-p+1 : strlen(p));
                            ^
156.     pkt->flags |= AV_PKT_FLAG_KEY;
157.     pkt->pos= p - ass->event_buffer + s->streams[0]->codec->extradata_size;

libavformat/assdec.c:155:5: 
153. 
154.     end= strchr(p, '\n');
155.     av_new_packet(pkt, end ? end-p+1 : strlen(p));
         ^
156.     pkt->flags |= AV_PKT_FLAG_KEY;
157.     pkt->pos= p - ass->event_buffer + s->streams[0]->codec->extradata_size;

libavcodec/avpacket.c:60:1: start of procedure av_new_packet()
  58. }
  59. 
  60. int av_new_packet(AVPacket *pkt, int size)
      ^
  61. {
  62.     uint8_t *data= NULL;

libavcodec/avpacket.c:62:5: 
  60. int av_new_packet(AVPacket *pkt, int size)
  61. {
  62.     uint8_t *data= NULL;
          ^
  63.     if((unsigned)size < (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE)
  64.         data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);

libavcodec/avpacket.c:63:8: Taking true branch
  61. {
  62.     uint8_t *data= NULL;
  63.     if((unsigned)size < (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE)
             ^
  64.         data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
  65.     if (data){

libavcodec/avpacket.c:64:9: 
  62.     uint8_t *data= NULL;
  63.     if((unsigned)size < (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE)
  64.         data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
              ^
  65.     if (data){
  66.         memset(data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

libavutil/mem.c:64:1: start of procedure av_malloc()
    62.    linker will do it automatically. */
    63. 
    64. void *av_malloc(size_t size)
        ^
    65. {
    66.     void *ptr = NULL;

libavutil/mem.c:66:5: 
    64. void *av_malloc(size_t size)
    65. {
    66.     void *ptr = NULL;
            ^
    67. #if CONFIG_MEMALIGN_HACK
    68.     long diff;

libavutil/mem.c:71:5: 
    69. #endif
    70. 
    71.     assert(size);
            ^
    72. 
    73.     /* let's disallow possible ambiguous cases */

libavutil/mem.c:74:9: Taking true branch
    72. 
    73.     /* let's disallow possible ambiguous cases */
    74.     if (size > (INT_MAX-32) || !size)
                ^
    75.         return NULL;
    76. 

libavutil/mem.c:75:9: 
    73.     /* let's disallow possible ambiguous cases */
    74.     if (size > (INT_MAX-32) || !size)
    75.         return NULL;
                ^
    76. 
    77. #if CONFIG_MEMALIGN_HACK

libavutil/mem.c:117:1: return from a call to av_malloc
    115. #endif
    116.     return ptr;
    117. }
         ^
    118. 
    119. void *av_realloc(void *ptr, size_t size)

libavcodec/avpacket.c:65:9: Taking false branch
  63.     if((unsigned)size < (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE)
  64.         data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
  65.     if (data){
              ^
  66.         memset(data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
  67.     }else

libavcodec/avpacket.c:68:9: 
  66.         memset(data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
  67.     }else
  68.         size=0;
              ^
  69. 
  70.     av_init_packet(pkt);

libavcodec/avpacket.c:70:5: 
  68.         size=0;
  69. 
  70.     av_init_packet(pkt);
          ^
  71.     pkt->data = data;
  72.     pkt->size = size;

libavcodec/avpacket.c:46:1: start of procedure av_init_packet()
    44. }
    45. 
    46. void av_init_packet(AVPacket *pkt)
        ^
    47. {
    48.     pkt->pts   = AV_NOPTS_VALUE;

libavcodec/avpacket.c:48:5: 
    46. void av_init_packet(AVPacket *pkt)
    47. {
    48.     pkt->pts   = AV_NOPTS_VALUE;
            ^
    49.     pkt->dts   = AV_NOPTS_VALUE;
    50.     pkt->pos   = -1;

libavcodec/avpacket.c:49:5: 
    47. {
    48.     pkt->pts   = AV_NOPTS_VALUE;
    49.     pkt->dts   = AV_NOPTS_VALUE;
            ^
    50.     pkt->pos   = -1;
    51.     pkt->duration = 0;

libavcodec/avpacket.c:50:5: 
    48.     pkt->pts   = AV_NOPTS_VALUE;
    49.     pkt->dts   = AV_NOPTS_VALUE;
    50.     pkt->pos   = -1;
            ^
    51.     pkt->duration = 0;
    52.     pkt->convergence_duration = 0;

libavcodec/avpacket.c:51:5: 
    49.     pkt->dts   = AV_NOPTS_VALUE;
    50.     pkt->pos   = -1;
    51.     pkt->duration = 0;
            ^
    52.     pkt->convergence_duration = 0;
    53.     pkt->flags = 0;

libavcodec/avpacket.c:52:5: 
    50.     pkt->pos   = -1;
    51.     pkt->duration = 0;
    52.     pkt->convergence_duration = 0;
            ^
    53.     pkt->flags = 0;
    54.     pkt->stream_index = 0;

libavcodec/avpacket.c:53:5: 
    51.     pkt->duration = 0;
    52.     pkt->convergence_duration = 0;
    53.     pkt->flags = 0;
            ^
    54.     pkt->stream_index = 0;
    55.     pkt->destruct= NULL;

libavcodec/avpacket.c:54:5: 
    52.     pkt->convergence_duration = 0;
    53.     pkt->flags = 0;
    54.     pkt->stream_index = 0;
            ^
    55.     pkt->destruct= NULL;
    56.     pkt->side_data       = NULL;

libavcodec/avpacket.c:55:5: 
    53.     pkt->flags = 0;
    54.     pkt->stream_index = 0;
    55.     pkt->destruct= NULL;
            ^
    56.     pkt->side_data       = NULL;
    57.     pkt->side_data_elems = 0;

libavcodec/avpacket.c:56:5: 
    54.     pkt->stream_index = 0;
    55.     pkt->destruct= NULL;
    56.     pkt->side_data       = NULL;
            ^
    57.     pkt->side_data_elems = 0;
    58. }

libavcodec/avpacket.c:57:5: 
    55.     pkt->destruct= NULL;
    56.     pkt->side_data       = NULL;
    57.     pkt->side_data_elems = 0;
            ^
    58. }
    59. 

libavcodec/avpacket.c:58:1: return from a call to av_init_packet
    56.     pkt->side_data       = NULL;
    57.     pkt->side_data_elems = 0;
    58. }
        ^
    59. 
    60. int av_new_packet(AVPacket *pkt, int size)

libavcodec/avpacket.c:71:5: 
  69. 
  70.     av_init_packet(pkt);
  71.     pkt->data = data;
          ^
  72.     pkt->size = size;
  73.     pkt->destruct = av_destruct_packet;

libavcodec/avpacket.c:72:5: 
  70.     av_init_packet(pkt);
  71.     pkt->data = data;
  72.     pkt->size = size;
          ^
  73.     pkt->destruct = av_destruct_packet;
  74.     if(!data)

libavcodec/avpacket.c:73:5: 
  71.     pkt->data = data;
  72.     pkt->size = size;
  73.     pkt->destruct = av_destruct_packet;
          ^
  74.     if(!data)
  75.         return AVERROR(ENOMEM);

libavcodec/avpacket.c:74:9: Taking true branch
  72.     pkt->size = size;
  73.     pkt->destruct = av_destruct_packet;
  74.     if(!data)
              ^
  75.         return AVERROR(ENOMEM);
  76.     return 0;

libavcodec/avpacket.c:75:9: 
  73.     pkt->destruct = av_destruct_packet;
  74.     if(!data)
  75.         return AVERROR(ENOMEM);
              ^
  76.     return 0;
  77. }

libavcodec/avpacket.c:77:1: return from a call to av_new_packet
  75.         return AVERROR(ENOMEM);
  76.     return 0;
  77. }
      ^
  78. 
  79. void av_shrink_packet(AVPacket *pkt, int size)

libavformat/assdec.c:156:5: 
154.     end= strchr(p, '\n');
155.     av_new_packet(pkt, end ? end-p+1 : strlen(p));
156.     pkt->flags |= AV_PKT_FLAG_KEY;
         ^
157.     pkt->pos= p - ass->event_buffer + s->streams[0]->codec->extradata_size;
158.     pkt->pts= pkt->dts= get_pts(p);

libavformat/assdec.c:157:5: 
155.     av_new_packet(pkt, end ? end-p+1 : strlen(p));
156.     pkt->flags |= AV_PKT_FLAG_KEY;
157.     pkt->pos= p - ass->event_buffer + s->streams[0]->codec->extradata_size;
         ^
158.     pkt->pts= pkt->dts= get_pts(p);
159.     memcpy(pkt->data, p, pkt->size);

libavformat/assdec.c:158:5: 
156.     pkt->flags |= AV_PKT_FLAG_KEY;
157.     pkt->pos= p - ass->event_buffer + s->streams[0]->codec->extradata_size;
158.     pkt->pts= pkt->dts= get_pts(p);
         ^
159.     memcpy(pkt->data, p, pkt->size);
160. 

libavformat/assdec.c:56:1: start of procedure get_pts()
  54. }
  55. 
  56. static int64_t get_pts(const uint8_t *p)
      ^
  57. {
  58.     int hour, min, sec, hsec;

libavformat/assdec.c:60:8: Taking false branch
  58.     int hour, min, sec, hsec;
  59. 
  60.     if(sscanf(p, "%*[^,],%d:%d:%d%*c%d", &hour, &min, &sec, &hsec) != 4)
             ^
  61.         return AV_NOPTS_VALUE;
  62. 

libavformat/assdec.c:65:5: 
  63. //    av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d [%s]\n", i, hour, min, sec, hsec, p);
  64. 
  65.     min+= 60*hour;
          ^
  66.     sec+= 60*min;
  67. 

libavformat/assdec.c:66:5: 
  64. 
  65.     min+= 60*hour;
  66.     sec+= 60*min;
          ^
  67. 
  68.     return sec*100+hsec;

libavformat/assdec.c:68:5: 
  66.     sec+= 60*min;
  67. 
  68.     return sec*100+hsec;
          ^
  69. }
  70. 

libavformat/assdec.c:69:1: return from a call to get_pts
  67. 
  68.     return sec*100+hsec;
  69. }
      ^
  70. 
  71. static int event_cmp(uint8_t **a, uint8_t **b)

libavformat/assdec.c:159:5: 
157.     pkt->pos= p - ass->event_buffer + s->streams[0]->codec->extradata_size;
158.     pkt->pts= pkt->dts= get_pts(p);
159.     memcpy(pkt->data, p, pkt->size);
         ^
160. 
161.     ass->event_index++;

static int read_packet(AVFormatContext *s, AVPacket *pkt)
{
    ASSContext *ass = s->priv_data;
    uint8_t *p, *end;
    if(ass->event_index >= ass->event_count)
        return AVERROR(EIO);
    p= ass->event[ ass->event_index ];
    end= strchr(p, '\n');
    av_new_packet(pkt, end ? end-p+1 : strlen(p));
    pkt->flags |= AV_PKT_FLAG_KEY;
    pkt->pos= p - ass->event_buffer + s->streams[0]->codec->extradata_size;
    pkt->pts= pkt->dts= get_pts(p);
    memcpy(pkt->data, p, pkt->size);
    ass->event_index++;
    return 0;
}
["static int read_packet(AVFormatContext *s, AVPacket *pkt)\n{\n    ASSContext *ass = s->priv_data;\n    uint8_t *p, *end;\n    if(ass->event_index >= ass->event_count)\n        return AVERROR(EIO);\n    p= ass->event[ ass->event_index ];\n    end= strchr(p, '\\n');\n    av_new_packet(pkt, end ? end-p+1 : strlen(p));\n    pkt->flags |= AV_PKT_FLAG_KEY;\n    pkt->pos= p - ass->event_buffer + s->streams[0]->codec->extradata_size;\n    pkt->pts= pkt->dts= get_pts(p);\n    memcpy(pkt->data, p, pkt->size);\n    ass->event_index++;\n    return 0;\n}", 'int av_new_packet(AVPacket *pkt, int size)\n{\n    uint8_t *data= NULL;\n    if((unsigned)size < (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE)\n        data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);\n    if (data){\n        memset(data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);\n    }else\n        size=0;\n    av_init_packet(pkt);\n    pkt->data = data;\n    pkt->size = size;\n    pkt->destruct = av_destruct_packet;\n    if(!data)\n        return AVERROR(ENOMEM);\n    return 0;\n}', 'void *av_malloc(size_t size)\n{\n    void *ptr = NULL;\n#if CONFIG_MEMALIGN_HACK\n    long diff;\n#endif\n    assert(size);\n    if (size > (INT_MAX-32) || !size)\n        return NULL;\n#if CONFIG_MEMALIGN_HACK\n    ptr = malloc(size+32);\n    if(!ptr)\n        return ptr;\n    diff= ((-(long)ptr - 1)&31) + 1;\n    ptr = (char*)ptr + diff;\n    ((char*)ptr)[-1]= diff;\n#elif HAVE_POSIX_MEMALIGN\n    if (posix_memalign(&ptr,32,size))\n        ptr = NULL;\n#elif HAVE_MEMALIGN\n    ptr = memalign(32,size);\n#else\n    ptr = malloc(size);\n#endif\n    return ptr;\n}', 'void av_init_packet(AVPacket *pkt)\n{\n    pkt->pts   = AV_NOPTS_VALUE;\n    pkt->dts   = AV_NOPTS_VALUE;\n    pkt->pos   = -1;\n    pkt->duration = 0;\n    pkt->convergence_duration = 0;\n    pkt->flags = 0;\n    pkt->stream_index = 0;\n    pkt->destruct= NULL;\n    pkt->side_data       = NULL;\n    pkt->side_data_elems = 0;\n}', 'static int64_t get_pts(const uint8_t *p)\n{\n    int hour, min, sec, hsec;\n    if(sscanf(p, "%*[^,],%d:%d:%d%*c%d", &hour, &min, &sec, &hsec) != 4)\n        return AV_NOPTS_VALUE;\n    min+= 60*hour;\n    sec+= 60*min;\n    return sec*100+hsec;\n}']