libavformat/mpegts.c:692: error: Null Dereference
  pointer `&gb->buffer` last assigned on line 683 could be null and is dereferenced by call to `get_bits1()` at line 692, column 20.

libavformat/mpegts.c:676:1: start of procedure read_sl_header()
674. }
675. 
676. static int read_sl_header(PESContext *pes, SLConfigDescr *sl, const uint8_t *buf, int buf_size)
     ^
677. {
678.     GetBitContext gb;

libavformat/mpegts.c:679:5: 
677. {
678.     GetBitContext gb;
679.     int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
         ^
680.     int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
681.     int dts_flag = -1, cts_flag = -1;

libavformat/mpegts.c:680:5: 
678.     GetBitContext gb;
679.     int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
680.     int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
         ^
681.     int dts_flag = -1, cts_flag = -1;
682.     int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;

libavformat/mpegts.c:681:5: 
679.     int au_start_flag = 0, au_end_flag = 0, ocr_flag = 0, idle_flag = 0;
680.     int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
681.     int dts_flag = -1, cts_flag = -1;
         ^
682.     int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
683.     init_get_bits(&gb, buf, buf_size*8);

libavformat/mpegts.c:682:5: 
680.     int padding_flag = 0, padding_bits = 0, inst_bitrate_flag = 0;
681.     int dts_flag = -1, cts_flag = -1;
682.     int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
         ^
683.     init_get_bits(&gb, buf, buf_size*8);
684. 

libavformat/mpegts.c:683:5: 
681.     int dts_flag = -1, cts_flag = -1;
682.     int64_t dts = AV_NOPTS_VALUE, cts = AV_NOPTS_VALUE;
683.     init_get_bits(&gb, buf, buf_size*8);
         ^
684. 
685.     if (sl->use_au_start)

libavcodec/get_bits.h:306:1: start of procedure init_get_bits()
  304.  * responsible for checking for the buffer end yourself (take advantage of the padding)!
  305.  */
  306. static inline void init_get_bits(GetBitContext *s,
       ^
  307.                    const uint8_t *buffer, int bit_size)
  308. {

libavcodec/get_bits.h:309:5: 
  307.                    const uint8_t *buffer, int bit_size)
  308. {
  309.     int buffer_size = (bit_size+7)>>3;
           ^
  310.     if (buffer_size < 0 || bit_size < 0) {
  311.         buffer_size = bit_size = 0;

libavcodec/get_bits.h:310:9: Taking true branch
  308. {
  309.     int buffer_size = (bit_size+7)>>3;
  310.     if (buffer_size < 0 || bit_size < 0) {
               ^
  311.         buffer_size = bit_size = 0;
  312.         buffer = NULL;

libavcodec/get_bits.h:311:9: 
  309.     int buffer_size = (bit_size+7)>>3;
  310.     if (buffer_size < 0 || bit_size < 0) {
  311.         buffer_size = bit_size = 0;
               ^
  312.         buffer = NULL;
  313.     }

libavcodec/get_bits.h:312:9: 
  310.     if (buffer_size < 0 || bit_size < 0) {
  311.         buffer_size = bit_size = 0;
  312.         buffer = NULL;
               ^
  313.     }
  314. 

libavcodec/get_bits.h:315:5: 
  313.     }
  314. 
  315.     s->buffer       = buffer;
           ^
  316.     s->size_in_bits = bit_size;
  317.     s->buffer_end   = buffer + buffer_size;

libavcodec/get_bits.h:316:5: 
  314. 
  315.     s->buffer       = buffer;
  316.     s->size_in_bits = bit_size;
           ^
  317.     s->buffer_end   = buffer + buffer_size;
  318.     s->index        = 0;

libavcodec/get_bits.h:317:5: 
  315.     s->buffer       = buffer;
  316.     s->size_in_bits = bit_size;
  317.     s->buffer_end   = buffer + buffer_size;
           ^
  318.     s->index        = 0;
  319. }

libavcodec/get_bits.h:318:5: 
  316.     s->size_in_bits = bit_size;
  317.     s->buffer_end   = buffer + buffer_size;
  318.     s->index        = 0;
           ^
  319. }
  320. 

libavcodec/get_bits.h:319:1: return from a call to init_get_bits
  317.     s->buffer_end   = buffer + buffer_size;
  318.     s->index        = 0;
  319. }
       ^
  320. 
  321. static inline void align_get_bits(GetBitContext *s)

libavformat/mpegts.c:685:9: Taking false branch
683.     init_get_bits(&gb, buf, buf_size*8);
684. 
685.     if (sl->use_au_start)
             ^
686.         au_start_flag = get_bits1(&gb);
687.     if (sl->use_au_end)

libavformat/mpegts.c:687:9: Taking false branch
685.     if (sl->use_au_start)
686.         au_start_flag = get_bits1(&gb);
687.     if (sl->use_au_end)
             ^
688.         au_end_flag = get_bits1(&gb);
689.     if (!sl->use_au_start && !sl->use_au_end)

libavformat/mpegts.c:689:10: Taking true branch
687.     if (sl->use_au_end)
688.         au_end_flag = get_bits1(&gb);
689.     if (!sl->use_au_start && !sl->use_au_end)
              ^
690.         au_start_flag = au_end_flag = 1;
691.     if (sl->ocr_len > 0)

libavformat/mpegts.c:689:31: Taking true branch
687.     if (sl->use_au_end)
688.         au_end_flag = get_bits1(&gb);
689.     if (!sl->use_au_start && !sl->use_au_end)
                                   ^
690.         au_start_flag = au_end_flag = 1;
691.     if (sl->ocr_len > 0)

libavformat/mpegts.c:690:9: 
688.         au_end_flag = get_bits1(&gb);
689.     if (!sl->use_au_start && !sl->use_au_end)
690.         au_start_flag = au_end_flag = 1;
             ^
691.     if (sl->ocr_len > 0)
692.         ocr_flag = get_bits1(&gb);

libavformat/mpegts.c:691:9: Taking true branch
689.     if (!sl->use_au_start && !sl->use_au_end)
690.         au_start_flag = au_end_flag = 1;
691.     if (sl->ocr_len > 0)
             ^
692.         ocr_flag = get_bits1(&gb);
693.     if (sl->use_idle)

libavformat/mpegts.c:692:9: 
690.         au_start_flag = au_end_flag = 1;
691.     if (sl->ocr_len > 0)
692.         ocr_flag = get_bits1(&gb);
             ^
693.     if (sl->use_idle)
694.         idle_flag = get_bits1(&gb);

libavcodec/get_bits.h:230:1: start of procedure get_bits1()
  228. }
  229. 
  230. static inline unsigned int get_bits1(GetBitContext *s){
       ^
  231.     unsigned int index = s->index;
  232.     uint8_t result = s->buffer[index>>3];

libavcodec/get_bits.h:231:5: 
  229. 
  230. static inline unsigned int get_bits1(GetBitContext *s){
  231.     unsigned int index = s->index;
           ^
  232.     uint8_t result = s->buffer[index>>3];
  233. #ifdef ALT_BITSTREAM_READER_LE

libavcodec/get_bits.h:232:5: 
  230. static inline unsigned int get_bits1(GetBitContext *s){
  231.     unsigned int index = s->index;
  232.     uint8_t result = s->buffer[index>>3];
           ^
  233. #ifdef ALT_BITSTREAM_READER_LE
  234.     result >>= index & 7;
