libavformat/mpegts.c:698: error: Null Dereference
  pointer `&gb->buffer` last assigned on line 695 could be null and is dereferenced by call to `get_bits1()` at line 698, column 25.

libavformat/mpegts.c:688:1: start of procedure read_sl_header()
686. }
687. 
688. static int read_sl_header(PESContext *pes, SLConfigDescr *sl, const uint8_t *buf, int buf_size)
     ^
689. {
690.     GetBitContext gb;

libavformat/mpegts.c:691:5: 
689. {
690.     GetBitContext gb;
691.     int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
         ^
692.     int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
693.     int dts_flag = -1, cts_flag = -1;

libavformat/mpegts.c:692:5: 
690.     GetBitContext gb;
691.     int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
692.     int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
         ^
693.     int dts_flag = -1, cts_flag = -1;
694.     int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;

libavformat/mpegts.c:693:5: 
691.     int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
692.     int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
693.     int dts_flag = -1, cts_flag = -1;
         ^
694.     int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
695.     init_get_bits(&gb, buf, buf_size*8);

libavformat/mpegts.c:694:5: 
692.     int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
693.     int dts_flag = -1, cts_flag = -1;
694.     int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
         ^
695.     init_get_bits(&gb, buf, buf_size*8);
696. 

libavformat/mpegts.c:695:5: 
693.     int dts_flag = -1, cts_flag = -1;
694.     int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
695.     init_get_bits(&gb, buf, buf_size*8);
         ^
696. 
697.     if (sl->use_au_start)

libavcodec/get_bits.h:375:1: start of procedure init_get_bits()
  373.  * @return 0 on success, AVERROR_INVALIDDATA if the buffer_size would overflow.
  374.  */
  375. static inline int init_get_bits(GetBitContext *s, const uint8_t *buffer,
       ^
  376.                                 int bit_size)
  377. {

libavcodec/get_bits.h:379:5: 
  377. {
  378.     int buffer_size;
  379.     int ret = 0;
           ^
  380. 
  381.     if (bit_size > INT_MAX - 7 || bit_size < 0 || !buffer) {

libavcodec/get_bits.h:381:9: Taking true branch
  379.     int ret = 0;
  380. 
  381.     if (bit_size > INT_MAX - 7 || bit_size < 0 || !buffer) {
               ^
  382.         buffer_size = bit_size = 0;
  383.         buffer      = NULL;

libavcodec/get_bits.h:382:9: 
  380. 
  381.     if (bit_size > INT_MAX - 7 || bit_size < 0 || !buffer) {
  382.         buffer_size = bit_size = 0;
               ^
  383.         buffer      = NULL;
  384.         ret         = AVERROR_INVALIDDATA;

libavcodec/get_bits.h:383:9: 
  381.     if (bit_size > INT_MAX - 7 || bit_size < 0 || !buffer) {
  382.         buffer_size = bit_size = 0;
  383.         buffer      = NULL;
               ^
  384.         ret         = AVERROR_INVALIDDATA;
  385.     }

libavcodec/get_bits.h:384:9: 
  382.         buffer_size = bit_size = 0;
  383.         buffer      = NULL;
  384.         ret         = AVERROR_INVALIDDATA;
               ^
  385.     }
  386. 

libavcodec/get_bits.h:387:5: 
  385.     }
  386. 
  387.     buffer_size = (bit_size + 7) >> 3;
           ^
  388. 
  389.     s->buffer             = buffer;

libavcodec/get_bits.h:389:5: 
  387.     buffer_size = (bit_size + 7) >> 3;
  388. 
  389.     s->buffer             = buffer;
           ^
  390.     s->size_in_bits       = bit_size;
  391. #if !UNCHECKED_BITSTREAM_READER

libavcodec/get_bits.h:390:5: 
  388. 
  389.     s->buffer             = buffer;
  390.     s->size_in_bits       = bit_size;
           ^
  391. #if !UNCHECKED_BITSTREAM_READER
  392.     s->size_in_bits_plus8 = bit_size + 8;

libavcodec/get_bits.h:392:5: 
  390.     s->size_in_bits       = bit_size;
  391. #if !UNCHECKED_BITSTREAM_READER
  392.     s->size_in_bits_plus8 = bit_size + 8;
           ^
  393. #endif
  394.     s->buffer_end         = buffer + buffer_size;

libavcodec/get_bits.h:394:5: 
  392.     s->size_in_bits_plus8 = bit_size + 8;
  393. #endif
  394.     s->buffer_end         = buffer + buffer_size;
           ^
  395.     s->index              = 0;
  396. 

libavcodec/get_bits.h:395:5: 
  393. #endif
  394.     s->buffer_end         = buffer + buffer_size;
  395.     s->index              = 0;
           ^
  396. 
  397.     return ret;

libavcodec/get_bits.h:397:5: 
  395.     s->index              = 0;
  396. 
  397.     return ret;
           ^
  398. }
  399. 

libavcodec/get_bits.h:398:1: return from a call to init_get_bits
  396. 
  397.     return ret;
  398. }
       ^
  399. 
  400. /**

libavformat/mpegts.c:697:9: Taking true branch
695.     init_get_bits(&gb, buf, buf_size*8);
696. 
697.     if (sl->use_au_start)
             ^
698.         au_start_flag = get_bits1(&gb);
699.     if (sl->use_au_end)

libavformat/mpegts.c:698:9: 
696. 
697.     if (sl->use_au_start)
698.         au_start_flag = get_bits1(&gb);
             ^
699.     if (sl->use_au_end)
700.         au_end_flag = get_bits1(&gb);

libavcodec/get_bits.h:271:1: start of procedure get_bits1()
  269. }
  270. 
  271. static inline unsigned int get_bits1(GetBitContext *s)
       ^
  272. {
  273.     unsigned int index = s->index;

libavcodec/get_bits.h:273:5: 
  271. static inline unsigned int get_bits1(GetBitContext *s)
  272. {
  273.     unsigned int index = s->index;
           ^
  274.     uint8_t result     = s->buffer[index >> 3];
  275. #ifdef BITSTREAM_READER_LE

libavcodec/get_bits.h:274:5: 
  272. {
  273.     unsigned int index = s->index;
  274.     uint8_t result     = s->buffer[index >> 3];
           ^
  275. #ifdef BITSTREAM_READER_LE
  276.     result >>= index & 7;
