libavcodec/smacker.c:611: error: Null Dereference
  pointer `&gb->buffer` last assigned on line 609 could be null and is dereferenced by call to `get_bits1()` at line 611, column 9.

libavcodec/smacker.c:585:1: start of procedure smka_decode_frame()
583.  * Decode Smacker audio data
584.  */
585. static int smka_decode_frame(AVCodecContext *avctx, void *data,
     ^
586.                              int *got_frame_ptr, AVPacket *avpkt)
587. {

libavcodec/smacker.c:588:5: 
586.                              int *got_frame_ptr, AVPacket *avpkt)
587. {
588.     SmackerAudioContext *s = avctx->priv_data;
         ^
589.     const uint8_t *buf = avpkt->data;
590.     int buf_size = avpkt->size;

libavcodec/smacker.c:589:5: 
587. {
588.     SmackerAudioContext *s = avctx->priv_data;
589.     const uint8_t *buf = avpkt->data;
         ^
590.     int buf_size = avpkt->size;
591.     GetBitContext gb;

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

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

libavcodec/smacker.c:602:9: Taking false branch
600.     int pred[2] = {0, 0};
601. 
602.     if (buf_size <= 4) {
             ^
603.         av_log(avctx, AV_LOG_ERROR, "packet is too small\n");
604.         return AVERROR(EINVAL);

libavcodec/smacker.c:607:5: 
605.     }
606. 
607.     unp_size = AV_RL32(buf);
         ^
608. 
609.     init_get_bits(&gb, buf + 4, (buf_size - 4) * 8);

libavcodec/smacker.c:609:5: 
607.     unp_size = AV_RL32(buf);
608. 
609.     init_get_bits(&gb, buf + 4, (buf_size - 4) * 8);
         ^
610. 
611.     if(!get_bits1(&gb)){

libavcodec/get_bits.h:306:1: start of procedure init_get_bits()
  304.  * responsible for checking for the buffer end yourself (take advantage of the padding)!
  305.  */
  306. static inline void init_get_bits(GetBitContext *s,
       ^
  307.                    const uint8_t *buffer, int bit_size)
  308. {

libavcodec/get_bits.h:309:5: 
  307.                    const uint8_t *buffer, int bit_size)
  308. {
  309.     int buffer_size = (bit_size+7)>>3;
           ^
  310.     if (buffer_size < 0 || bit_size < 0) {
  311.         buffer_size = bit_size = 0;

libavcodec/get_bits.h:310:9: Taking true branch
  308. {
  309.     int buffer_size = (bit_size+7)>>3;
  310.     if (buffer_size < 0 || bit_size < 0) {
               ^
  311.         buffer_size = bit_size = 0;
  312.         buffer = NULL;

libavcodec/get_bits.h:311:9: 
  309.     int buffer_size = (bit_size+7)>>3;
  310.     if (buffer_size < 0 || bit_size < 0) {
  311.         buffer_size = bit_size = 0;
               ^
  312.         buffer = NULL;
  313.     }

libavcodec/get_bits.h:312:9: 
  310.     if (buffer_size < 0 || bit_size < 0) {
  311.         buffer_size = bit_size = 0;
  312.         buffer = NULL;
               ^
  313.     }
  314. 

libavcodec/get_bits.h:315:5: 
  313.     }
  314. 
  315.     s->buffer       = buffer;
           ^
  316.     s->size_in_bits = bit_size;
  317.     s->buffer_end   = buffer + buffer_size;

libavcodec/get_bits.h:316:5: 
  314. 
  315.     s->buffer       = buffer;
  316.     s->size_in_bits = bit_size;
           ^
  317.     s->buffer_end   = buffer + buffer_size;
  318.     s->index        = 0;

libavcodec/get_bits.h:317:5: 
  315.     s->buffer       = buffer;
  316.     s->size_in_bits = bit_size;
  317.     s->buffer_end   = buffer + buffer_size;
           ^
  318.     s->index        = 0;
  319. }

libavcodec/get_bits.h:318:5: 
  316.     s->size_in_bits = bit_size;
  317.     s->buffer_end   = buffer + buffer_size;
  318.     s->index        = 0;
           ^
  319. }
  320. 

libavcodec/get_bits.h:319:1: return from a call to init_get_bits
  317.     s->buffer_end   = buffer + buffer_size;
  318.     s->index        = 0;
  319. }
       ^
  320. 
  321. static inline void align_get_bits(GetBitContext *s)

libavcodec/smacker.c:611:9: 
609.     init_get_bits(&gb, buf + 4, (buf_size - 4) * 8);
610. 
611.     if(!get_bits1(&gb)){
             ^
612.         av_log(avctx, AV_LOG_INFO, "Sound: no data\n");
613.         *got_frame_ptr = 0;

libavcodec/get_bits.h:230:1: start of procedure get_bits1()
  228. }
  229. 
  230. static inline unsigned int get_bits1(GetBitContext *s){
       ^
  231.     unsigned int index = s->index;
  232.     uint8_t result = s->buffer[index>>3];

libavcodec/get_bits.h:231:5: 
  229. 
  230. static inline unsigned int get_bits1(GetBitContext *s){
  231.     unsigned int index = s->index;
           ^
  232.     uint8_t result = s->buffer[index>>3];
  233. #ifdef ALT_BITSTREAM_READER_LE

libavcodec/get_bits.h:232:5: 
  230. static inline unsigned int get_bits1(GetBitContext *s){
  231.     unsigned int index = s->index;
  232.     uint8_t result = s->buffer[index>>3];
           ^
  233. #ifdef ALT_BITSTREAM_READER_LE
  234.     result >>= index & 7;
