libavcodec/smacker.c:584: error: Null Dereference
  pointer `&gb->buffer` last assigned on line 582 could be null and is dereferenced by call to `get_bits1()` at line 584, column 9.

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

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

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

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

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

libavcodec/bitstream.h:719:1: start of procedure init_get_bits()
  717.  * @param bit_size the size of the buffer in bits
  718.  */
  719. static inline void init_get_bits(GetBitContext *s,
       ^
  720.                    const uint8_t *buffer, int bit_size)
  721. {

libavcodec/bitstream.h:722:5: 
  720.                    const uint8_t *buffer, int bit_size)
  721. {
  722.     int buffer_size= (bit_size+7)>>3;
           ^
  723.     if(buffer_size < 0 || bit_size < 0) {
  724.         buffer_size = bit_size = 0;

libavcodec/bitstream.h:723:8: Taking true branch
  721. {
  722.     int buffer_size= (bit_size+7)>>3;
  723.     if(buffer_size < 0 || bit_size < 0) {
              ^
  724.         buffer_size = bit_size = 0;
  725.         buffer = NULL;

libavcodec/bitstream.h:724:9: 
  722.     int buffer_size= (bit_size+7)>>3;
  723.     if(buffer_size < 0 || bit_size < 0) {
  724.         buffer_size = bit_size = 0;
               ^
  725.         buffer = NULL;
  726.     }

libavcodec/bitstream.h:725:9: 
  723.     if(buffer_size < 0 || bit_size < 0) {
  724.         buffer_size = bit_size = 0;
  725.         buffer = NULL;
               ^
  726.     }
  727. 

libavcodec/bitstream.h:728:5: 
  726.     }
  727. 
  728.     s->buffer= buffer;
           ^
  729.     s->size_in_bits= bit_size;
  730.     s->buffer_end= buffer + buffer_size;

libavcodec/bitstream.h:729:5: 
  727. 
  728.     s->buffer= buffer;
  729.     s->size_in_bits= bit_size;
           ^
  730.     s->buffer_end= buffer + buffer_size;
  731. #ifdef ALT_BITSTREAM_READER

libavcodec/bitstream.h:730:5: 
  728.     s->buffer= buffer;
  729.     s->size_in_bits= bit_size;
  730.     s->buffer_end= buffer + buffer_size;
           ^
  731. #ifdef ALT_BITSTREAM_READER
  732.     s->index=0;

libavcodec/bitstream.h:732:5: 
  730.     s->buffer_end= buffer + buffer_size;
  731. #ifdef ALT_BITSTREAM_READER
  732.     s->index=0;
           ^
  733. #elif defined LIBMPEG2_BITSTREAM_READER
  734.     s->buffer_ptr = (uint8_t*)((intptr_t)buffer&(~1));

libavcodec/bitstream.h:742:1: return from a call to init_get_bits
  740.     skip_bits_long(s, 0);
  741. #endif
  742. }
       ^
  743. 
  744. static inline void align_get_bits(GetBitContext *s)

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

libavcodec/bitstream.h:647:1: start of procedure get_bits1()
  645. }
  646. 
  647. static inline unsigned int get_bits1(GetBitContext *s){
       ^
  648. #ifdef ALT_BITSTREAM_READER
  649.     int index= s->index;

libavcodec/bitstream.h:649:5: 
  647. static inline unsigned int get_bits1(GetBitContext *s){
  648. #ifdef ALT_BITSTREAM_READER
  649.     int index= s->index;
           ^
  650.     uint8_t result= s->buffer[ index>>3 ];
  651. #ifdef ALT_BITSTREAM_READER_LE

libavcodec/bitstream.h:650:5: 
  648. #ifdef ALT_BITSTREAM_READER
  649.     int index= s->index;
  650.     uint8_t result= s->buffer[ index>>3 ];
           ^
  651. #ifdef ALT_BITSTREAM_READER_LE
  652.     result>>= (index&0x07);
