libavcodec/smacker.c:585: error: Null Dereference
  pointer `&gb->buffer` last assigned on line 583 could be null and is dereferenced by call to `get_bits1()` at line 585, column 9.

libavcodec/smacker.c:569:1: start of procedure smka_decode_frame()
567.  * Decode Smacker audio data
568.  */
569. static int smka_decode_frame(AVCodecContext *avctx, void *data, int *data_size, const uint8_t *buf, int buf_size)
     ^
570. {
571.     GetBitContext gb;

libavcodec/smacker.c:574:5: 
572.     HuffContext h[4];
573.     VLC vlc[4];
574.     int16_t *samples = data;
         ^
575.     int val;
576.     int i, res;

libavcodec/smacker.c:579:5: 
577.     int unp_size;
578.     int bits, stereo;
579.     int pred[2] = {0, 0};
         ^
580. 
581.     unp_size = AV_RL32(buf);

libavcodec/smacker.c:581:5: 
579.     int pred[2] = {0, 0};
580. 
581.     unp_size = AV_RL32(buf);
         ^
582. 
583.     init_get_bits(&gb, buf + 4, (buf_size - 4) * 8);

libavcodec/smacker.c:583:5: 
581.     unp_size = AV_RL32(buf);
582. 
583.     init_get_bits(&gb, buf + 4, (buf_size - 4) * 8);
         ^
584. 
585.     if(!get_bits1(&gb)){

libavcodec/bitstream.h:745:1: start of procedure init_get_bits()
  743.  * @param bit_size the size of the buffer in bits
  744.  */
  745. static inline void init_get_bits(GetBitContext *s,
       ^
  746.                    const uint8_t *buffer, int bit_size)
  747. {

libavcodec/bitstream.h:748:5: 
  746.                    const uint8_t *buffer, int bit_size)
  747. {
  748.     int buffer_size= (bit_size+7)>>3;
           ^
  749.     if(buffer_size < 0 || bit_size < 0) {
  750.         buffer_size = bit_size = 0;

libavcodec/bitstream.h:749:8: Taking true branch
  747. {
  748.     int buffer_size= (bit_size+7)>>3;
  749.     if(buffer_size < 0 || bit_size < 0) {
              ^
  750.         buffer_size = bit_size = 0;
  751.         buffer = NULL;

libavcodec/bitstream.h:750:9: 
  748.     int buffer_size= (bit_size+7)>>3;
  749.     if(buffer_size < 0 || bit_size < 0) {
  750.         buffer_size = bit_size = 0;
               ^
  751.         buffer = NULL;
  752.     }

libavcodec/bitstream.h:751:9: 
  749.     if(buffer_size < 0 || bit_size < 0) {
  750.         buffer_size = bit_size = 0;
  751.         buffer = NULL;
               ^
  752.     }
  753. 

libavcodec/bitstream.h:754:5: 
  752.     }
  753. 
  754.     s->buffer= buffer;
           ^
  755.     s->size_in_bits= bit_size;
  756.     s->buffer_end= buffer + buffer_size;

libavcodec/bitstream.h:755:5: 
  753. 
  754.     s->buffer= buffer;
  755.     s->size_in_bits= bit_size;
           ^
  756.     s->buffer_end= buffer + buffer_size;
  757. #ifdef ALT_BITSTREAM_READER

libavcodec/bitstream.h:756:5: 
  754.     s->buffer= buffer;
  755.     s->size_in_bits= bit_size;
  756.     s->buffer_end= buffer + buffer_size;
           ^
  757. #ifdef ALT_BITSTREAM_READER
  758.     s->index=0;

libavcodec/bitstream.h:758:5: 
  756.     s->buffer_end= buffer + buffer_size;
  757. #ifdef ALT_BITSTREAM_READER
  758.     s->index=0;
           ^
  759. #elif defined LIBMPEG2_BITSTREAM_READER
  760.     s->buffer_ptr = (uint8_t*)((intptr_t)buffer&(~1));

libavcodec/bitstream.h:768:1: return from a call to init_get_bits
  766.     skip_bits_long(s, 0);
  767. #endif
  768. }
       ^
  769. 
  770. static inline void align_get_bits(GetBitContext *s)

libavcodec/smacker.c:585:9: 
583.     init_get_bits(&gb, buf + 4, (buf_size - 4) * 8);
584. 
585.     if(!get_bits1(&gb)){
             ^
586.         av_log(avctx, AV_LOG_INFO, "Sound: no data\n");
587.         *data_size = 0;

libavcodec/bitstream.h:673:1: start of procedure get_bits1()
  671. }
  672. 
  673. static inline unsigned int get_bits1(GetBitContext *s){
       ^
  674. #ifdef ALT_BITSTREAM_READER
  675.     int index= s->index;

libavcodec/bitstream.h:675:5: 
  673. static inline unsigned int get_bits1(GetBitContext *s){
  674. #ifdef ALT_BITSTREAM_READER
  675.     int index= s->index;
           ^
  676.     uint8_t result= s->buffer[ index>>3 ];
  677. #ifdef ALT_BITSTREAM_READER_LE

libavcodec/bitstream.h:676:5: 
  674. #ifdef ALT_BITSTREAM_READER
  675.     int index= s->index;
  676.     uint8_t result= s->buffer[ index>>3 ];
           ^
  677. #ifdef ALT_BITSTREAM_READER_LE
  678.     result>>= (index&0x07);
