libavcodec/smacker.c:589: error: Null Dereference
  pointer `&gb->buffer` last assigned on line 587 could be null and is dereferenced by call to `get_bits1()` at line 589, column 9.

libavcodec/smacker.c:570:1: start of procedure smka_decode_frame()
568.  * Decode Smacker audio data
569.  */
570. static int smka_decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
     ^
571. {
572.     const uint8_t *buf = avpkt->data;

libavcodec/smacker.c:572:5: 
570. static int smka_decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
571. {
572.     const uint8_t *buf = avpkt->data;
         ^
573.     int buf_size = avpkt->size;
574.     GetBitContext gb;

libavcodec/smacker.c:573:5: 
571. {
572.     const uint8_t *buf = avpkt->data;
573.     int buf_size = avpkt->size;
         ^
574.     GetBitContext gb;
575.     HuffContext h[4];

libavcodec/smacker.c:577:5: 
575.     HuffContext h[4];
576.     VLC vlc[4];
577.     int16_t *samples = data;
         ^
578.     int8_t *samples8 = data;
579.     int val;

libavcodec/smacker.c:578:5: 
576.     VLC vlc[4];
577.     int16_t *samples = data;
578.     int8_t *samples8 = data;
         ^
579.     int val;
580.     int i, res;

libavcodec/smacker.c:583:5: 
581.     int unp_size;
582.     int bits, stereo;
583.     int pred[2] = {0, 0};
         ^
584. 
585.     unp_size = AV_RL32(buf);

libavcodec/smacker.c:585:5: 
583.     int pred[2] = {0, 0};
584. 
585.     unp_size = AV_RL32(buf);
         ^
586. 
587.     init_get_bits(&gb, buf + 4, (buf_size - 4) * 8);

libavcodec/smacker.c:587:5: 
585.     unp_size = AV_RL32(buf);
586. 
587.     init_get_bits(&gb, buf + 4, (buf_size - 4) * 8);
         ^
588. 
589.     if(!get_bits1(&gb)){

libavcodec/get_bits.h:383:1: start of procedure init_get_bits()
  381.  * responsible for checking for the buffer end yourself (take advantage of the padding)!
  382.  */
  383. static inline void init_get_bits(GetBitContext *s,
       ^
  384.                    const uint8_t *buffer, int bit_size)
  385. {

libavcodec/get_bits.h:386:5: 
  384.                    const uint8_t *buffer, int bit_size)
  385. {
  386.     int buffer_size = (bit_size+7)>>3;
           ^
  387.     if (buffer_size < 0 || bit_size < 0) {
  388.         buffer_size = bit_size = 0;

libavcodec/get_bits.h:387:9: Taking true branch
  385. {
  386.     int buffer_size = (bit_size+7)>>3;
  387.     if (buffer_size < 0 || bit_size < 0) {
               ^
  388.         buffer_size = bit_size = 0;
  389.         buffer = NULL;

libavcodec/get_bits.h:388:9: 
  386.     int buffer_size = (bit_size+7)>>3;
  387.     if (buffer_size < 0 || bit_size < 0) {
  388.         buffer_size = bit_size = 0;
               ^
  389.         buffer = NULL;
  390.     }

libavcodec/get_bits.h:389:9: 
  387.     if (buffer_size < 0 || bit_size < 0) {
  388.         buffer_size = bit_size = 0;
  389.         buffer = NULL;
               ^
  390.     }
  391. 

libavcodec/get_bits.h:392:5: 
  390.     }
  391. 
  392.     s->buffer       = buffer;
           ^
  393.     s->size_in_bits = bit_size;
  394.     s->buffer_end   = buffer + buffer_size;

libavcodec/get_bits.h:393:5: 
  391. 
  392.     s->buffer       = buffer;
  393.     s->size_in_bits = bit_size;
           ^
  394.     s->buffer_end   = buffer + buffer_size;
  395. #ifdef ALT_BITSTREAM_READER

libavcodec/get_bits.h:394:5: 
  392.     s->buffer       = buffer;
  393.     s->size_in_bits = bit_size;
  394.     s->buffer_end   = buffer + buffer_size;
           ^
  395. #ifdef ALT_BITSTREAM_READER
  396.     s->index        = 0;

libavcodec/get_bits.h:396:5: 
  394.     s->buffer_end   = buffer + buffer_size;
  395. #ifdef ALT_BITSTREAM_READER
  396.     s->index        = 0;
           ^
  397. #elif defined A32_BITSTREAM_READER
  398.     s->buffer_ptr   = (uint32_t*)((intptr_t)buffer & ~3);

libavcodec/get_bits.h:402:1: return from a call to init_get_bits
  400.     skip_bits_long(s, 0);
  401. #endif
  402. }
       ^
  403. 
  404. static inline void align_get_bits(GetBitContext *s)

libavcodec/smacker.c:589:9: 
587.     init_get_bits(&gb, buf + 4, (buf_size - 4) * 8);
588. 
589.     if(!get_bits1(&gb)){
             ^
590.         av_log(avctx, AV_LOG_INFO, "Sound: no data\n");
591.         *data_size = 0;

libavcodec/get_bits.h:303:1: start of procedure get_bits1()
  301. }
  302. 
  303. static inline unsigned int get_bits1(GetBitContext *s){
       ^
  304. #ifdef ALT_BITSTREAM_READER
  305.     unsigned int index = s->index;

libavcodec/get_bits.h:305:5: 
  303. static inline unsigned int get_bits1(GetBitContext *s){
  304. #ifdef ALT_BITSTREAM_READER
  305.     unsigned int index = s->index;
           ^
  306.     uint8_t result = s->buffer[index>>3];
  307. #ifdef ALT_BITSTREAM_READER_LE

libavcodec/get_bits.h:306:5: 
  304. #ifdef ALT_BITSTREAM_READER
  305.     unsigned int index = s->index;
  306.     uint8_t result = s->buffer[index>>3];
           ^
  307. #ifdef ALT_BITSTREAM_READER_LE
  308.     result >>= index & 7;
