libavformat/rmdec.c:823: error: Null Dereference
  pointer `pkt->data` last assigned on line 822 could be null and is dereferenced by call to `memcpy()` at line 823, column 9.

libavformat/rmdec.c:811:1: start of procedure ff_rm_retrieve_cache()
809. }
810. 
811. int
     ^
812. ff_rm_retrieve_cache (AVFormatContext *s, ByteIOContext *pb,
813.                       AVStream *st, RMStream *ast, AVPacket *pkt)

libavformat/rmdec.c:815:5: 
813.                       AVStream *st, RMStream *ast, AVPacket *pkt)
814. {
815.     RMDemuxContext *rm = s->priv_data;
         ^
816. 
817.     assert (rm->audio_pkt_cnt > 0);

libavformat/rmdec.c:817:5: 
815.     RMDemuxContext *rm = s->priv_data;
816. 
817.     assert (rm->audio_pkt_cnt > 0);
         ^
818. 
819.     if (st->codec->codec_id == CODEC_ID_AAC)

libavformat/rmdec.c:819:9: Taking false branch
817.     assert (rm->audio_pkt_cnt > 0);
818. 
819.     if (st->codec->codec_id == CODEC_ID_AAC)
             ^
820.         av_get_packet(pb, pkt, ast->sub_packet_lengths[ast->sub_packet_cnt - rm->audio_pkt_cnt]);
821.     else {

libavformat/rmdec.c:822:9: 
820.         av_get_packet(pb, pkt, ast->sub_packet_lengths[ast->sub_packet_cnt - rm->audio_pkt_cnt]);
821.     else {
822.         av_new_packet(pkt, st->codec->block_align);
             ^
823.         memcpy(pkt->data, ast->pkt.data + st->codec->block_align * //FIXME avoid this
824.                (ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),

libavcodec/avpacket.c:48:1: start of procedure av_new_packet()
  46. }
  47. 
  48. int av_new_packet(AVPacket *pkt, int size)
      ^
  49. {
  50.     uint8_t *data= NULL;

libavcodec/avpacket.c:50:5: 
  48. int av_new_packet(AVPacket *pkt, int size)
  49. {
  50.     uint8_t *data= NULL;
          ^
  51.     if((unsigned)size < (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE)
  52.         data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);

libavcodec/avpacket.c:51:8: Taking true branch
  49. {
  50.     uint8_t *data= NULL;
  51.     if((unsigned)size < (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE)
             ^
  52.         data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
  53.     if (data){

libavcodec/avpacket.c:52:9: 
  50.     uint8_t *data= NULL;
  51.     if((unsigned)size < (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE)
  52.         data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
              ^
  53.     if (data){
  54.         memset(data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

libavutil/mem.c:47:1: start of procedure av_malloc()
    45.    linker will do it automatically. */
    46. 
    47. void *av_malloc(unsigned int size)
        ^
    48. {
    49.     void *ptr = NULL;

libavutil/mem.c:49:5: 
    47. void *av_malloc(unsigned int size)
    48. {
    49.     void *ptr = NULL;
            ^
    50. #if CONFIG_MEMALIGN_HACK
    51.     long diff;

libavutil/mem.c:55:8: Taking true branch
    53. 
    54.     /* let's disallow possible ambiguous cases */
    55.     if(size > (INT_MAX-16) )
               ^
    56.         return NULL;
    57. 

libavutil/mem.c:56:9: 
    54.     /* let's disallow possible ambiguous cases */
    55.     if(size > (INT_MAX-16) )
    56.         return NULL;
                ^
    57. 
    58. #if CONFIG_MEMALIGN_HACK

libavutil/mem.c:100:1: return from a call to av_malloc
     98. #endif
     99.     return ptr;
    100. }
         ^
    101. 
    102. void *av_realloc(void *ptr, unsigned int size)

libavcodec/avpacket.c:53:9: Taking false branch
  51.     if((unsigned)size < (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE)
  52.         data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
  53.     if (data){
              ^
  54.         memset(data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
  55.     }else

libavcodec/avpacket.c:56:9: 
  54.         memset(data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
  55.     }else
  56.         size=0;
              ^
  57. 
  58.     av_init_packet(pkt);

libavcodec/avpacket.c:58:5: 
  56.         size=0;
  57. 
  58.     av_init_packet(pkt);
          ^
  59.     pkt->data = data;
  60.     pkt->size = size;

libavcodec/avpacket.c:36:1: start of procedure av_init_packet()
    34. }
    35. 
    36. void av_init_packet(AVPacket *pkt)
        ^
    37. {
    38.     pkt->pts   = AV_NOPTS_VALUE;

libavcodec/avpacket.c:38:5: 
    36. void av_init_packet(AVPacket *pkt)
    37. {
    38.     pkt->pts   = AV_NOPTS_VALUE;
            ^
    39.     pkt->dts   = AV_NOPTS_VALUE;
    40.     pkt->pos   = -1;

libavcodec/avpacket.c:39:5: 
    37. {
    38.     pkt->pts   = AV_NOPTS_VALUE;
    39.     pkt->dts   = AV_NOPTS_VALUE;
            ^
    40.     pkt->pos   = -1;
    41.     pkt->duration = 0;

libavcodec/avpacket.c:40:5: 
    38.     pkt->pts   = AV_NOPTS_VALUE;
    39.     pkt->dts   = AV_NOPTS_VALUE;
    40.     pkt->pos   = -1;
            ^
    41.     pkt->duration = 0;
    42.     pkt->convergence_duration = 0;

libavcodec/avpacket.c:41:5: 
    39.     pkt->dts   = AV_NOPTS_VALUE;
    40.     pkt->pos   = -1;
    41.     pkt->duration = 0;
            ^
    42.     pkt->convergence_duration = 0;
    43.     pkt->flags = 0;

libavcodec/avpacket.c:42:5: 
    40.     pkt->pos   = -1;
    41.     pkt->duration = 0;
    42.     pkt->convergence_duration = 0;
            ^
    43.     pkt->flags = 0;
    44.     pkt->stream_index = 0;

libavcodec/avpacket.c:43:5: 
    41.     pkt->duration = 0;
    42.     pkt->convergence_duration = 0;
    43.     pkt->flags = 0;
            ^
    44.     pkt->stream_index = 0;
    45.     pkt->destruct= NULL;

libavcodec/avpacket.c:44:5: 
    42.     pkt->convergence_duration = 0;
    43.     pkt->flags = 0;
    44.     pkt->stream_index = 0;
            ^
    45.     pkt->destruct= NULL;
    46. }

libavcodec/avpacket.c:45:5: 
    43.     pkt->flags = 0;
    44.     pkt->stream_index = 0;
    45.     pkt->destruct= NULL;
            ^
    46. }
    47. 

libavcodec/avpacket.c:46:1: return from a call to av_init_packet
    44.     pkt->stream_index = 0;
    45.     pkt->destruct= NULL;
    46. }
        ^
    47. 
    48. int av_new_packet(AVPacket *pkt, int size)

libavcodec/avpacket.c:59:5: 
  57. 
  58.     av_init_packet(pkt);
  59.     pkt->data = data;
          ^
  60.     pkt->size = size;
  61.     pkt->destruct = av_destruct_packet;

libavcodec/avpacket.c:60:5: 
  58.     av_init_packet(pkt);
  59.     pkt->data = data;
  60.     pkt->size = size;
          ^
  61.     pkt->destruct = av_destruct_packet;
  62.     if(!data)

libavcodec/avpacket.c:61:5: 
  59.     pkt->data = data;
  60.     pkt->size = size;
  61.     pkt->destruct = av_destruct_packet;
          ^
  62.     if(!data)
  63.         return AVERROR(ENOMEM);

libavcodec/avpacket.c:62:9: Taking true branch
  60.     pkt->size = size;
  61.     pkt->destruct = av_destruct_packet;
  62.     if(!data)
              ^
  63.         return AVERROR(ENOMEM);
  64.     return 0;

libavcodec/avpacket.c:63:9: 
  61.     pkt->destruct = av_destruct_packet;
  62.     if(!data)
  63.         return AVERROR(ENOMEM);
              ^
  64.     return 0;
  65. }

libavcodec/avpacket.c:65:1: return from a call to av_new_packet
  63.         return AVERROR(ENOMEM);
  64.     return 0;
  65. }
      ^
  66. 
  67. void av_shrink_packet(AVPacket *pkt, int size)

libavformat/rmdec.c:823:9: 
821.     else {
822.         av_new_packet(pkt, st->codec->block_align);
823.         memcpy(pkt->data, ast->pkt.data + st->codec->block_align * //FIXME avoid this
             ^
824.                (ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),
825.                st->codec->block_align);

int
ff_rm_retrieve_cache (AVFormatContext *s, ByteIOContext *pb,
                      AVStream *st, RMStream *ast, AVPacket *pkt)
{
    RMDemuxContext *rm = s->priv_data;
    assert (rm->audio_pkt_cnt > 0);
    if (st->codec->codec_id == CODEC_ID_AAC)
        av_get_packet(pb, pkt, ast->sub_packet_lengths[ast->sub_packet_cnt - rm->audio_pkt_cnt]);
    else {
        av_new_packet(pkt, st->codec->block_align);
        memcpy(pkt->data, ast->pkt.data + st->codec->block_align *
               (ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),
               st->codec->block_align);
    }
    rm->audio_pkt_cnt--;
    if ((pkt->pts = ast->audiotimestamp) != AV_NOPTS_VALUE) {
        ast->audiotimestamp = AV_NOPTS_VALUE;
        pkt->flags = PKT_FLAG_KEY;
    } else
        pkt->flags = 0;
    pkt->stream_index = st->index;
    return rm->audio_pkt_cnt;
}
['int\nff_rm_retrieve_cache (AVFormatContext *s, ByteIOContext *pb,\n                      AVStream *st, RMStream *ast, AVPacket *pkt)\n{\n    RMDemuxContext *rm = s->priv_data;\n    assert (rm->audio_pkt_cnt > 0);\n    if (st->codec->codec_id == CODEC_ID_AAC)\n        av_get_packet(pb, pkt, ast->sub_packet_lengths[ast->sub_packet_cnt - rm->audio_pkt_cnt]);\n    else {\n        av_new_packet(pkt, st->codec->block_align);\n        memcpy(pkt->data, ast->pkt.data + st->codec->block_align *\n               (ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),\n               st->codec->block_align);\n    }\n    rm->audio_pkt_cnt--;\n    if ((pkt->pts = ast->audiotimestamp) != AV_NOPTS_VALUE) {\n        ast->audiotimestamp = AV_NOPTS_VALUE;\n        pkt->flags = PKT_FLAG_KEY;\n    } else\n        pkt->flags = 0;\n    pkt->stream_index = st->index;\n    return rm->audio_pkt_cnt;\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(unsigned int size)\n{\n    void *ptr = NULL;\n#if CONFIG_MEMALIGN_HACK\n    long diff;\n#endif\n    if(size > (INT_MAX-16) )\n        return NULL;\n#if CONFIG_MEMALIGN_HACK\n    ptr = malloc(size+16);\n    if(!ptr)\n        return ptr;\n    diff= ((-(long)ptr - 1)&15) + 1;\n    ptr = (char*)ptr + diff;\n    ((char*)ptr)[-1]= diff;\n#elif HAVE_POSIX_MEMALIGN\n    if (posix_memalign(&ptr,16,size))\n        ptr = NULL;\n#elif HAVE_MEMALIGN\n    ptr = memalign(16,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}']