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:338:1: start of procedure init_get_bits()
  336.  * responsible for checking for the buffer end yourself (take advantage of the padding)!
  337.  */
  338. static inline void init_get_bits(GetBitContext *s,
       ^
  339.                    const uint8_t *buffer, int bit_size)
  340. {

libavcodec/get_bits.h:341:5: 
  339.                    const uint8_t *buffer, int bit_size)
  340. {
  341.     int buffer_size = (bit_size+7)>>3;
           ^
  342.     if (buffer_size < 0 || bit_size < 0) {
  343.         buffer_size = bit_size = 0;

libavcodec/get_bits.h:342:9: Taking true branch
  340. {
  341.     int buffer_size = (bit_size+7)>>3;
  342.     if (buffer_size < 0 || bit_size < 0) {
               ^
  343.         buffer_size = bit_size = 0;
  344.         buffer = NULL;

libavcodec/get_bits.h:343:9: 
  341.     int buffer_size = (bit_size+7)>>3;
  342.     if (buffer_size < 0 || bit_size < 0) {
  343.         buffer_size = bit_size = 0;
               ^
  344.         buffer = NULL;
  345.     }

libavcodec/get_bits.h:344:9: 
  342.     if (buffer_size < 0 || bit_size < 0) {
  343.         buffer_size = bit_size = 0;
  344.         buffer = NULL;
               ^
  345.     }
  346. 

libavcodec/get_bits.h:347:5: 
  345.     }
  346. 
  347.     s->buffer       = buffer;
           ^
  348.     s->size_in_bits = bit_size;
  349. #if !UNCHECKED_BITSTREAM_READER

libavcodec/get_bits.h:348:5: 
  346. 
  347.     s->buffer       = buffer;
  348.     s->size_in_bits = bit_size;
           ^
  349. #if !UNCHECKED_BITSTREAM_READER
  350.     s->size_in_bits_plus8 = bit_size + 8;

libavcodec/get_bits.h:350:5: 
  348.     s->size_in_bits = bit_size;
  349. #if !UNCHECKED_BITSTREAM_READER
  350.     s->size_in_bits_plus8 = bit_size + 8;
           ^
  351. #endif
  352.     s->buffer_end   = buffer + buffer_size;

libavcodec/get_bits.h:352:5: 
  350.     s->size_in_bits_plus8 = bit_size + 8;
  351. #endif
  352.     s->buffer_end   = buffer + buffer_size;
           ^
  353.     s->index        = 0;
  354. }

libavcodec/get_bits.h:353:5: 
  351. #endif
  352.     s->buffer_end   = buffer + buffer_size;
  353.     s->index        = 0;
           ^
  354. }
  355. 

libavcodec/get_bits.h:354:1: return from a call to init_get_bits
  352.     s->buffer_end   = buffer + buffer_size;
  353.     s->index        = 0;
  354. }
       ^
  355. 
  356. 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:259:1: start of procedure get_bits1()
  257. }
  258. 
  259. static inline unsigned int get_bits1(GetBitContext *s){
       ^
  260.     unsigned int index = s->index;
  261.     uint8_t result = s->buffer[index>>3];

libavcodec/get_bits.h:260:5: 
  258. 
  259. static inline unsigned int get_bits1(GetBitContext *s){
  260.     unsigned int index = s->index;
           ^
  261.     uint8_t result = s->buffer[index>>3];
  262. #ifdef ALT_BITSTREAM_READER_LE

libavcodec/get_bits.h:261:5: 
  259. static inline unsigned int get_bits1(GetBitContext *s){
  260.     unsigned int index = s->index;
  261.     uint8_t result = s->buffer[index>>3];
           ^
  262. #ifdef ALT_BITSTREAM_READER_LE
  263.     result >>= index & 7;
