libavformat/mpegts.c:688: error: Null Dereference
  pointer `&gb->buffer` last assigned on line 683 could be null and is dereferenced by call to `get_bits1()` at line 688, column 23.

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:339:1: start of procedure init_get_bits()
  337.  * @param bit_size the size of the buffer in bits
  338.  */
  339. static inline void init_get_bits(GetBitContext *s, const uint8_t *buffer,
       ^
  340.                                  int bit_size)
  341. {

libavcodec/get_bits.h:342:5: 
  340.                                  int bit_size)
  341. {
  342.     int buffer_size = (bit_size+7)>>3;
           ^
  343.     if (buffer_size < 0 || bit_size < 0) {
  344.         buffer_size = bit_size = 0;

libavcodec/get_bits.h:343:9: Taking true branch
  341. {
  342.     int buffer_size = (bit_size+7)>>3;
  343.     if (buffer_size < 0 || bit_size < 0) {
               ^
  344.         buffer_size = bit_size = 0;
  345.         buffer = NULL;

libavcodec/get_bits.h:344:9: 
  342.     int buffer_size = (bit_size+7)>>3;
  343.     if (buffer_size < 0 || bit_size < 0) {
  344.         buffer_size = bit_size = 0;
               ^
  345.         buffer = NULL;
  346.     }

libavcodec/get_bits.h:345:9: 
  343.     if (buffer_size < 0 || bit_size < 0) {
  344.         buffer_size = bit_size = 0;
  345.         buffer = NULL;
               ^
  346.     }
  347. 

libavcodec/get_bits.h:348:5: 
  346.     }
  347. 
  348.     s->buffer       = buffer;
           ^
  349.     s->size_in_bits = bit_size;
  350. #if !UNCHECKED_BITSTREAM_READER

libavcodec/get_bits.h:349:5: 
  347. 
  348.     s->buffer       = buffer;
  349.     s->size_in_bits = bit_size;
           ^
  350. #if !UNCHECKED_BITSTREAM_READER
  351.     s->size_in_bits_plus8 = bit_size + 8;

libavcodec/get_bits.h:351:5: 
  349.     s->size_in_bits = bit_size;
  350. #if !UNCHECKED_BITSTREAM_READER
  351.     s->size_in_bits_plus8 = bit_size + 8;
           ^
  352. #endif
  353.     s->buffer_end   = buffer + buffer_size;

libavcodec/get_bits.h:353:5: 
  351.     s->size_in_bits_plus8 = bit_size + 8;
  352. #endif
  353.     s->buffer_end   = buffer + buffer_size;
           ^
  354.     s->index        = 0;
  355. }

libavcodec/get_bits.h:354:5: 
  352. #endif
  353.     s->buffer_end   = buffer + buffer_size;
  354.     s->index        = 0;
           ^
  355. }
  356. 

libavcodec/get_bits.h:355:1: return from a call to init_get_bits
  353.     s->buffer_end   = buffer + buffer_size;
  354.     s->index        = 0;
  355. }
       ^
  356. 
  357. 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 true 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:688:9: 
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)
690.         au_start_flag = au_end_flag = 1;

libavcodec/get_bits.h:255:1: start of procedure get_bits1()
  253. }
  254. 
  255. static inline unsigned int get_bits1(GetBitContext *s)
       ^
  256. {
  257.     unsigned int index = s->index;

libavcodec/get_bits.h:257:5: 
  255. static inline unsigned int get_bits1(GetBitContext *s)
  256. {
  257.     unsigned int index = s->index;
           ^
  258.     uint8_t result = s->buffer[index>>3];
  259. #ifdef BITSTREAM_READER_LE

libavcodec/get_bits.h:258:5: 
  256. {
  257.     unsigned int index = s->index;
  258.     uint8_t result = s->buffer[index>>3];
           ^
  259. #ifdef BITSTREAM_READER_LE
  260.     result >>= index & 7;
