libavformat/rtsp.c:1833: error: Null Dereference
  pointer `content` last assigned on line 1827 could be null and is dereferenced at line 1833, column 5.

libavformat/rtsp.c:1814:1: start of procedure sdp_read_header()
1812. }
1813. 
1814. static int sdp_read_header(AVFormatContext *s, AVFormatParameters *ap)
      ^
1815. {
1816.     RTSPState *rt = s->priv_data;

libavformat/rtsp.c:1816:5: 
1814. static int sdp_read_header(AVFormatContext *s, AVFormatParameters *ap)
1815. {
1816.     RTSPState *rt = s->priv_data;
          ^
1817.     RTSPStream *rtsp_st;
1818.     int size, i, err;

libavformat/rtsp.c:1822:10: 
1820.     char url[1024];
1821. 
1822.     if (!ff_network_init())
               ^
1823.         return AVERROR(EIO);
1824. 

libavformat/network.h:69:1: start of procedure ff_network_init()
  67. int ff_socket_nonblock(int socket, int enable);
  68. 
  69. static inline int ff_network_init(void)
      ^
  70. {
  71. #if HAVE_WINSOCK2_H

libavformat/network.h:76:5: 
  74.         return 0;
  75. #endif
  76.     return 1;
          ^
  77. }
  78. 

libavformat/network.h:77:1: return from a call to ff_network_init
  75. #endif
  76.     return 1;
  77. }
      ^
  78. 
  79. static inline int ff_network_wait_fd(int fd, int write)

libavformat/rtsp.c:1822:10: Taking false branch
1820.     char url[1024];
1821. 
1822.     if (!ff_network_init())
               ^
1823.         return AVERROR(EIO);
1824. 

libavformat/rtsp.c:1827:5: 
1825.     /* read the whole sdp file */
1826.     /* XXX: better loading */
1827.     content = av_malloc(SDP_MAX_SIZE);
          ^
1828.     size = avio_read(s->pb, content, SDP_MAX_SIZE - 1);
1829.     if (size <= 0) {

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:72:8: Taking false branch
  70. 
  71.     /* let's disallow possible ambiguous cases */
  72.     if(size > (INT_MAX-32) )
             ^
  73.         return NULL;
  74. 

libavutil/mem.c:83:9: Taking true branch
  81.     ((char*)ptr)[-1]= diff;
  82. #elif HAVE_POSIX_MEMALIGN
  83.     if (posix_memalign(&ptr,32,size))
              ^
  84.         ptr = NULL;
  85. #elif HAVE_MEMALIGN

libavutil/mem.c:84:9: 
  82. #elif HAVE_POSIX_MEMALIGN
  83.     if (posix_memalign(&ptr,32,size))
  84.         ptr = NULL;
              ^
  85. #elif HAVE_MEMALIGN
  86.     ptr = memalign(32,size);

libavutil/mem.c:114:5: 
  112.     ptr = malloc(size);
  113. #endif
  114.     return ptr;
           ^
  115. }
  116. 

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

libavformat/rtsp.c:1828:5: Skipping avio_read(): empty list of specs
1826.     /* XXX: better loading */
1827.     content = av_malloc(SDP_MAX_SIZE);
1828.     size = avio_read(s->pb, content, SDP_MAX_SIZE - 1);
          ^
1829.     if (size <= 0) {
1830.         av_free(content);

libavformat/rtsp.c:1829:9: Taking false branch
1827.     content = av_malloc(SDP_MAX_SIZE);
1828.     size = avio_read(s->pb, content, SDP_MAX_SIZE - 1);
1829.     if (size <= 0) {
              ^
1830.         av_free(content);
1831.         return AVERROR_INVALIDDATA;

libavformat/rtsp.c:1833:5: 
1831.         return AVERROR_INVALIDDATA;
1832.     }
1833.     content[size] ='\0';
          ^
1834. 
1835.     err = ff_sdp_parse(s, content);

static int sdp_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
    RTSPState *rt = s->priv_data;
    RTSPStream *rtsp_st;
    int size, i, err;
    char *content;
    char url[1024];
    if (!ff_network_init())
        return AVERROR(EIO);
    content = av_malloc(SDP_MAX_SIZE);
    size = avio_read(s->pb, content, SDP_MAX_SIZE - 1);
    if (size <= 0) {
        av_free(content);
        return AVERROR_INVALIDDATA;
    }
    content[size] ='\0';
    err = ff_sdp_parse(s, content);
    av_free(content);
    if (err) goto fail;
    for (i = 0; i < rt->nb_rtsp_streams; i++) {
        char namebuf[50];
        rtsp_st = rt->rtsp_streams[i];
        getnameinfo((struct sockaddr*) &rtsp_st->sdp_ip, sizeof(rtsp_st->sdp_ip),
                    namebuf, sizeof(namebuf), NULL, 0, NI_NUMERICHOST);
        ff_url_join(url, sizeof(url), "rtp", NULL,
                    namebuf, rtsp_st->sdp_port,
                    "?localport=%d&ttl=%d&connect=%d", rtsp_st->sdp_port,
                    rtsp_st->sdp_ttl,
                    rt->rtsp_flags & RTSP_FLAG_FILTER_SRC ? 1 : 0);
        if (ffurl_open(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE) < 0) {
            err = AVERROR_INVALIDDATA;
            goto fail;
        }
        if ((err = rtsp_open_transport_ctx(s, rtsp_st)))
            goto fail;
    }
    return 0;
fail:
    ff_rtsp_close_streams(s);
    ff_network_close();
    return err;
}
['static int sdp_read_header(AVFormatContext *s, AVFormatParameters *ap)\n{\n    RTSPState *rt = s->priv_data;\n    RTSPStream *rtsp_st;\n    int size, i, err;\n    char *content;\n    char url[1024];\n    if (!ff_network_init())\n        return AVERROR(EIO);\n    content = av_malloc(SDP_MAX_SIZE);\n    size = avio_read(s->pb, content, SDP_MAX_SIZE - 1);\n    if (size <= 0) {\n        av_free(content);\n        return AVERROR_INVALIDDATA;\n    }\n    content[size] =\'\\0\';\n    err = ff_sdp_parse(s, content);\n    av_free(content);\n    if (err) goto fail;\n    for (i = 0; i < rt->nb_rtsp_streams; i++) {\n        char namebuf[50];\n        rtsp_st = rt->rtsp_streams[i];\n        getnameinfo((struct sockaddr*) &rtsp_st->sdp_ip, sizeof(rtsp_st->sdp_ip),\n                    namebuf, sizeof(namebuf), NULL, 0, NI_NUMERICHOST);\n        ff_url_join(url, sizeof(url), "rtp", NULL,\n                    namebuf, rtsp_st->sdp_port,\n                    "?localport=%d&ttl=%d&connect=%d", rtsp_st->sdp_port,\n                    rtsp_st->sdp_ttl,\n                    rt->rtsp_flags & RTSP_FLAG_FILTER_SRC ? 1 : 0);\n        if (ffurl_open(&rtsp_st->rtp_handle, url, AVIO_FLAG_READ_WRITE) < 0) {\n            err = AVERROR_INVALIDDATA;\n            goto fail;\n        }\n        if ((err = rtsp_open_transport_ctx(s, rtsp_st)))\n            goto fail;\n    }\n    return 0;\nfail:\n    ff_rtsp_close_streams(s);\n    ff_network_close();\n    return err;\n}', 'static inline int ff_network_init(void)\n{\n#if HAVE_WINSOCK2_H\n    WSADATA wsaData;\n    if (WSAStartup(MAKEWORD(1,1), &wsaData))\n        return 0;\n#endif\n    return 1;\n}', 'void *av_malloc(size_t size)\n{\n    void *ptr = NULL;\n#if CONFIG_MEMALIGN_HACK\n    long diff;\n#endif\n    if(size > (INT_MAX-32) )\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}']