libavcodec/smacker.c:608: error: Null Dereference
  pointer `&gb->buffer` last assigned on line 606 could be null and is dereferenced by call to `get_bits1()` at line 608, column 9.

libavcodec/smacker.c:582:1: start of procedure smka_decode_frame()
580.  * Decode Smacker audio data
581.  */
582. static int smka_decode_frame(AVCodecContext *avctx, void *data,
     ^
583.                              int *got_frame_ptr, AVPacket *avpkt)
584. {

libavcodec/smacker.c:585:5: 
583.                              int *got_frame_ptr, AVPacket *avpkt)
584. {
585.     SmackerAudioContext *s = avctx->priv_data;
         ^
586.     const uint8_t *buf = avpkt->data;
587.     int buf_size = avpkt->size;

libavcodec/smacker.c:586:5: 
584. {
585.     SmackerAudioContext *s = avctx->priv_data;
586.     const uint8_t *buf = avpkt->data;
         ^
587.     int buf_size = avpkt->size;
588.     GetBitContext gb;

libavcodec/smacker.c:587:5: 
585.     SmackerAudioContext *s = avctx->priv_data;
586.     const uint8_t *buf = avpkt->data;
587.     int buf_size = avpkt->size;
         ^
588.     GetBitContext gb;
589.     HuffContext h[4] = { { 0 } };

libavcodec/smacker.c:589:5: 
587.     int buf_size = avpkt->size;
588.     GetBitContext gb;
589.     HuffContext h[4] = { { 0 } };
         ^
590.     VLC vlc[4]       = { { 0 } };
591.     int16_t *samples;

libavcodec/smacker.c:590:5: 
588.     GetBitContext gb;
589.     HuffContext h[4] = { { 0 } };
590.     VLC vlc[4]       = { { 0 } };
         ^
591.     int16_t *samples;
592.     uint8_t *samples8;

libavcodec/smacker.c:597:5: 
595.     int unp_size;
596.     int bits, stereo;
597.     int pred[2] = {0, 0};
         ^
598. 
599.     if (buf_size <= 4) {

libavcodec/smacker.c:599:9: Taking false branch
597.     int pred[2] = {0, 0};
598. 
599.     if (buf_size <= 4) {
             ^
600.         av_log(avctx, AV_LOG_ERROR, "packet is too small\n");
601.         return AVERROR(EINVAL);

libavcodec/smacker.c:604:5: 
602.     }
603. 
604.     unp_size = AV_RL32(buf);
         ^
605. 
606.     init_get_bits(&gb, buf + 4, (buf_size - 4) * 8);

libavutil/ppc/intreadwrite.h:44:1: start of procedure AV_RL32()
  42. 
  43. #define AV_RL32 AV_RL32
  44. static av_always_inline uint32_t AV_RL32(const void *p)
      ^
  45. {
  46.     uint32_t v;

libavutil/ppc/intreadwrite.h:47:5: Skipping __infer_skip_gcc_asm_stmt(): function or method not found
  45. {
  46.     uint32_t v;
  47.     __asm__ ("lwbrx   %0, %y1" : "=r"(v) : "Z"(*(const uint32_t*)p));
          ^
  48.     return v;
  49. }

libavutil/ppc/intreadwrite.h:48:5: 
  46.     uint32_t v;
  47.     __asm__ ("lwbrx   %0, %y1" : "=r"(v) : "Z"(*(const uint32_t*)p));
  48.     return v;
          ^
  49. }
  50. 

libavutil/ppc/intreadwrite.h:49:1: return from a call to AV_RL32
  47.     __asm__ ("lwbrx   %0, %y1" : "=r"(v) : "Z"(*(const uint32_t*)p));
  48.     return v;
  49. }
      ^
  50. 
  51. #define AV_WL32 AV_WL32

libavcodec/smacker.c:606:5: 
604.     unp_size = AV_RL32(buf);
605. 
606.     init_get_bits(&gb, buf + 4, (buf_size - 4) * 8);
         ^
607. 
608.     if(!get_bits1(&gb)){

libavcodec/get_bits.h:372:1: start of procedure init_get_bits()
  370.  * @return 0 on success, AVERROR_INVALIDDATA if the buffer_size would overflow.
  371.  */
  372. static inline int init_get_bits(GetBitContext *s, const uint8_t *buffer,
       ^
  373.                                 int bit_size)
  374. {

libavcodec/get_bits.h:376:5: 
  374. {
  375.     int buffer_size;
  376.     int ret = 0;
           ^
  377. 
  378.     if (bit_size > INT_MAX - 7 || bit_size <= 0) {

libavcodec/get_bits.h:378:9: Taking true branch
  376.     int ret = 0;
  377. 
  378.     if (bit_size > INT_MAX - 7 || bit_size <= 0) {
               ^
  379.         buffer_size = bit_size = 0;
  380.         buffer = NULL;

libavcodec/get_bits.h:379:9: 
  377. 
  378.     if (bit_size > INT_MAX - 7 || bit_size <= 0) {
  379.         buffer_size = bit_size = 0;
               ^
  380.         buffer = NULL;
  381.         ret = AVERROR_INVALIDDATA;

libavcodec/get_bits.h:380:9: 
  378.     if (bit_size > INT_MAX - 7 || bit_size <= 0) {
  379.         buffer_size = bit_size = 0;
  380.         buffer = NULL;
               ^
  381.         ret = AVERROR_INVALIDDATA;
  382.     }

libavcodec/get_bits.h:381:9: 
  379.         buffer_size = bit_size = 0;
  380.         buffer = NULL;
  381.         ret = AVERROR_INVALIDDATA;
               ^
  382.     }
  383. 

libavcodec/get_bits.h:384:5: 
  382.     }
  383. 
  384.     buffer_size = (bit_size + 7) >> 3;
           ^
  385. 
  386.     s->buffer       = buffer;

libavcodec/get_bits.h:386:5: 
  384.     buffer_size = (bit_size + 7) >> 3;
  385. 
  386.     s->buffer       = buffer;
           ^
  387.     s->size_in_bits = bit_size;
  388. #if !UNCHECKED_BITSTREAM_READER

libavcodec/get_bits.h:387:5: 
  385. 
  386.     s->buffer       = buffer;
  387.     s->size_in_bits = bit_size;
           ^
  388. #if !UNCHECKED_BITSTREAM_READER
  389.     s->size_in_bits_plus8 = bit_size + 8;

libavcodec/get_bits.h:389:5: 
  387.     s->size_in_bits = bit_size;
  388. #if !UNCHECKED_BITSTREAM_READER
  389.     s->size_in_bits_plus8 = bit_size + 8;
           ^
  390. #endif
  391.     s->buffer_end   = buffer + buffer_size;

libavcodec/get_bits.h:391:5: 
  389.     s->size_in_bits_plus8 = bit_size + 8;
  390. #endif
  391.     s->buffer_end   = buffer + buffer_size;
           ^
  392.     s->index        = 0;
  393.     return ret;

libavcodec/get_bits.h:392:5: 
  390. #endif
  391.     s->buffer_end   = buffer + buffer_size;
  392.     s->index        = 0;
           ^
  393.     return ret;
  394. }

libavcodec/get_bits.h:393:5: 
  391.     s->buffer_end   = buffer + buffer_size;
  392.     s->index        = 0;
  393.     return ret;
           ^
  394. }
  395. 

libavcodec/get_bits.h:394:1: return from a call to init_get_bits
  392.     s->index        = 0;
  393.     return ret;
  394. }
       ^
  395. 
  396. static inline void align_get_bits(GetBitContext *s)

libavcodec/smacker.c:608:9: 
606.     init_get_bits(&gb, buf + 4, (buf_size - 4) * 8);
607. 
608.     if(!get_bits1(&gb)){
             ^
609.         av_log(avctx, AV_LOG_INFO, "Sound: no data\n");
610.         *got_frame_ptr = 0;

libavcodec/get_bits.h:268:1: start of procedure get_bits1()
  266. }
  267. 
  268. static inline unsigned int get_bits1(GetBitContext *s)
       ^
  269. {
  270.     unsigned int index = s->index;

libavcodec/get_bits.h:270:5: 
  268. static inline unsigned int get_bits1(GetBitContext *s)
  269. {
  270.     unsigned int index = s->index;
           ^
  271.     uint8_t result = s->buffer[index>>3];
  272. #ifdef BITSTREAM_READER_LE

libavcodec/get_bits.h:271:5: 
  269. {
  270.     unsigned int index = s->index;
  271.     uint8_t result = s->buffer[index>>3];
           ^
  272. #ifdef BITSTREAM_READER_LE
  273.     result >>= index & 7;
