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:343:1: start of procedure init_get_bits()
  341.  * @param bit_size the size of the buffer in bits
  342.  */
  343. static inline void init_get_bits(GetBitContext *s, const uint8_t *buffer,
       ^
  344.                                  int bit_size)
  345. {

libavcodec/get_bits.h:346:5: 
  344.                                  int bit_size)
  345. {
  346.     int buffer_size = (bit_size+7)>>3;
           ^
  347.     if (buffer_size < 0 || bit_size < 0) {
  348.         buffer_size = bit_size = 0;

libavcodec/get_bits.h:347:9: Taking true branch
  345. {
  346.     int buffer_size = (bit_size+7)>>3;
  347.     if (buffer_size < 0 || bit_size < 0) {
               ^
  348.         buffer_size = bit_size = 0;
  349.         buffer = NULL;

libavcodec/get_bits.h:348:9: 
  346.     int buffer_size = (bit_size+7)>>3;
  347.     if (buffer_size < 0 || bit_size < 0) {
  348.         buffer_size = bit_size = 0;
               ^
  349.         buffer = NULL;
  350.     }

libavcodec/get_bits.h:349:9: 
  347.     if (buffer_size < 0 || bit_size < 0) {
  348.         buffer_size = bit_size = 0;
  349.         buffer = NULL;
               ^
  350.     }
  351. 

libavcodec/get_bits.h:352:5: 
  350.     }
  351. 
  352.     s->buffer       = buffer;
           ^
  353.     s->size_in_bits = bit_size;
  354. #if !UNCHECKED_BITSTREAM_READER

libavcodec/get_bits.h:353:5: 
  351. 
  352.     s->buffer       = buffer;
  353.     s->size_in_bits = bit_size;
           ^
  354. #if !UNCHECKED_BITSTREAM_READER
  355.     s->size_in_bits_plus8 = bit_size + 8;

libavcodec/get_bits.h:355:5: 
  353.     s->size_in_bits = bit_size;
  354. #if !UNCHECKED_BITSTREAM_READER
  355.     s->size_in_bits_plus8 = bit_size + 8;
           ^
  356. #endif
  357.     s->buffer_end   = buffer + buffer_size;

libavcodec/get_bits.h:357:5: 
  355.     s->size_in_bits_plus8 = bit_size + 8;
  356. #endif
  357.     s->buffer_end   = buffer + buffer_size;
           ^
  358.     s->index        = 0;
  359. }

libavcodec/get_bits.h:358:5: 
  356. #endif
  357.     s->buffer_end   = buffer + buffer_size;
  358.     s->index        = 0;
           ^
  359. }
  360. 

libavcodec/get_bits.h:359:1: return from a call to init_get_bits
  357.     s->buffer_end   = buffer + buffer_size;
  358.     s->index        = 0;
  359. }
       ^
  360. 
  361. 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:259:1: start of procedure get_bits1()
  257. }
  258. 
  259. static inline unsigned int get_bits1(GetBitContext *s)
       ^
  260. {
  261.     unsigned int index = s->index;

libavcodec/get_bits.h:261:5: 
  259. static inline unsigned int get_bits1(GetBitContext *s)
  260. {
  261.     unsigned int index = s->index;
           ^
  262.     uint8_t result = s->buffer[index>>3];
  263. #ifdef ALT_BITSTREAM_READER_LE

libavcodec/get_bits.h:262:5: 
  260. {
  261.     unsigned int index = s->index;
  262.     uint8_t result = s->buffer[index>>3];
           ^
  263. #ifdef ALT_BITSTREAM_READER_LE
  264.     result >>= index & 7;
