libavcodec/smacker.c:613: error: Null Dereference
  pointer `&gb->buffer` last assigned on line 611 could be null and is dereferenced by call to `get_bits1()` at line 613, column 9.

libavcodec/smacker.c:587:1: start of procedure smka_decode_frame()
585.  * Decode Smacker audio data
586.  */
587. static int smka_decode_frame(AVCodecContext *avctx, void *data,
     ^
588.                              int *got_frame_ptr, AVPacket *avpkt)
589. {

libavcodec/smacker.c:590:5: 
588.                              int *got_frame_ptr, AVPacket *avpkt)
589. {
590.     SmackerAudioContext *s = avctx->priv_data;
         ^
591.     const uint8_t *buf = avpkt->data;
592.     int buf_size = avpkt->size;

libavcodec/smacker.c:591:5: 
589. {
590.     SmackerAudioContext *s = avctx->priv_data;
591.     const uint8_t *buf = avpkt->data;
         ^
592.     int buf_size = avpkt->size;
593.     GetBitContext gb;

libavcodec/smacker.c:592:5: 
590.     SmackerAudioContext *s = avctx->priv_data;
591.     const uint8_t *buf = avpkt->data;
592.     int buf_size = avpkt->size;
         ^
593.     GetBitContext gb;
594.     HuffContext h[4];

libavcodec/smacker.c:602:5: 
600.     int unp_size;
601.     int bits, stereo;
602.     int pred[2] = {0, 0};
         ^
603. 
604.     if (buf_size <= 4) {

libavcodec/smacker.c:604:9: Taking false branch
602.     int pred[2] = {0, 0};
603. 
604.     if (buf_size <= 4) {
             ^
605.         av_log(avctx, AV_LOG_ERROR, "packet is too small\n");
606.         return AVERROR(EINVAL);

libavcodec/smacker.c:609:5: 
607.     }
608. 
609.     unp_size = AV_RL32(buf);
         ^
610. 
611.     init_get_bits(&gb, buf + 4, (buf_size - 4) * 8);

libavcodec/smacker.c:611:5: 
609.     unp_size = AV_RL32(buf);
610. 
611.     init_get_bits(&gb, buf + 4, (buf_size - 4) * 8);
         ^
612. 
613.     if(!get_bits1(&gb)){

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)

libavcodec/smacker.c:613:9: 
611.     init_get_bits(&gb, buf + 4, (buf_size - 4) * 8);
612. 
613.     if(!get_bits1(&gb)){
             ^
614.         av_log(avctx, AV_LOG_INFO, "Sound: no data\n");
615.         *got_frame_ptr = 0;

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;
