libavcodec/wmavoice.c:1666: error: Null Dereference
  pointer `gb->buffer` last assigned on line 1659 could be null and is dereferenced by call to `get_bits1()` at line 1666, column 10.

libavcodec/wmavoice.c:1651:1: start of procedure check_bits_for_superframe()
1649.  * @return -1 if unsupported, 1 on not enough bits or 0 if OK.
1650.  */
1651. static int check_bits_for_superframe(GetBitContext *orig_gb,
      ^
1652.                                      WMAVoiceContext *s)
1653. {

libavcodec/wmavoice.c:1654:5: 
1652.                                      WMAVoiceContext *s)
1653. {
1654.     GetBitContext s_gb, *gb = &s_gb;
          ^
1655.     int n, need_bits, bd_idx;
1656.     const struct frame_type_desc *frame_desc;

libavcodec/wmavoice.c:1659:5: 
1657. 
1658.     /* initialize a copy */
1659.     init_get_bits(gb, orig_gb->buffer, orig_gb->size_in_bits);
          ^
1660.     skip_bits_long(gb, get_bits_count(orig_gb));
1661.     assert(get_bits_left(gb) == get_bits_left(orig_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/wmavoice.c:1660:5: 
1658.     /* initialize a copy */
1659.     init_get_bits(gb, orig_gb->buffer, orig_gb->size_in_bits);
1660.     skip_bits_long(gb, get_bits_count(orig_gb));
          ^
1661.     assert(get_bits_left(gb) == get_bits_left(orig_gb));
1662. 

libavcodec/get_bits.h:192:1: start of procedure get_bits_count()
  190. #define GET_CACHE(name, gb) ((uint32_t)name##_cache)
  191. 
  192. static inline int get_bits_count(const GetBitContext *s)
       ^
  193. {
  194.     return s->index;

libavcodec/get_bits.h:194:5: 
  192. static inline int get_bits_count(const GetBitContext *s)
  193. {
  194.     return s->index;
           ^
  195. }
  196. 

libavcodec/get_bits.h:195:1: return from a call to get_bits_count
  193. {
  194.     return s->index;
  195. }
       ^
  196. 
  197. static inline void skip_bits_long(GetBitContext *s, int n){

libavcodec/get_bits.h:197:1: start of procedure skip_bits_long()
  195. }
  196. 
  197. static inline void skip_bits_long(GetBitContext *s, int n){
       ^
  198. #if UNCHECKED_BITSTREAM_READER
  199.     s->index += n;

libavcodec/get_bits.h:199:5: 
  197. static inline void skip_bits_long(GetBitContext *s, int n){
  198. #if UNCHECKED_BITSTREAM_READER
  199.     s->index += n;
           ^
  200. #else
  201.     s->index += av_clip(n, -s->index, s->size_in_bits_plus8 - s->index);

libavcodec/get_bits.h:203:1: return from a call to skip_bits_long
  201.     s->index += av_clip(n, -s->index, s->size_in_bits_plus8 - s->index);
  202. #endif
  203. }
       ^
  204. 
  205. /**

libavcodec/wmavoice.c:1661:5: 
1659.     init_get_bits(gb, orig_gb->buffer, orig_gb->size_in_bits);
1660.     skip_bits_long(gb, get_bits_count(orig_gb));
1661.     assert(get_bits_left(gb) == get_bits_left(orig_gb));
          ^
1662. 
1663.     /* superframe header */

libavcodec/wmavoice.c:1664:9: 
1662. 
1663.     /* superframe header */
1664.     if (get_bits_left(gb) < 14)
              ^
1665.         return 1;
1666.     if (!get_bits1(gb))

libavcodec/get_bits.h:531:1: start of procedure get_bits_left()
  529. }
  530. 
  531. static inline int get_bits_left(GetBitContext *gb)
       ^
  532. {
  533.     return gb->size_in_bits - get_bits_count(gb);

libavcodec/get_bits.h:533:5: 
  531. static inline int get_bits_left(GetBitContext *gb)
  532. {
  533.     return gb->size_in_bits - get_bits_count(gb);
           ^
  534. }
  535. 

libavcodec/get_bits.h:192:1: start of procedure get_bits_count()
    190. #define GET_CACHE(name, gb) ((uint32_t)name##_cache)
    191. 
    192. static inline int get_bits_count(const GetBitContext *s)
         ^
    193. {
    194.     return s->index;

libavcodec/get_bits.h:194:5: 
    192. static inline int get_bits_count(const GetBitContext *s)
    193. {
    194.     return s->index;
             ^
    195. }
    196. 

libavcodec/get_bits.h:195:1: return from a call to get_bits_count
    193. {
    194.     return s->index;
    195. }
         ^
    196. 
    197. static inline void skip_bits_long(GetBitContext *s, int n){

libavcodec/get_bits.h:534:1: return from a call to get_bits_left
  532. {
  533.     return gb->size_in_bits - get_bits_count(gb);
  534. }
       ^
  535. 
  536. //#define TRACE

libavcodec/wmavoice.c:1664:9: Taking false branch
1662. 
1663.     /* superframe header */
1664.     if (get_bits_left(gb) < 14)
              ^
1665.         return 1;
1666.     if (!get_bits1(gb))

libavcodec/wmavoice.c:1666:10: 
1664.     if (get_bits_left(gb) < 14)
1665.         return 1;
1666.     if (!get_bits1(gb))
               ^
1667.         return -1;                        // WMAPro-in-WMAVoice superframe
1668.     if (get_bits1(gb)) skip_bits(gb, 12); // number of  samples in superframe

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;
