libavcodec/wmavoice.c:1659: error: Null Dereference
  pointer `gb->buffer` last assigned on line 1652 could be null and is dereferenced by call to `get_bits1()` at line 1659, column 10.

libavcodec/wmavoice.c:1644:1: start of procedure check_bits_for_superframe()
1642.  * @return -1 if unsupported, 1 on not enough bits or 0 if OK.
1643.  */
1644. static int check_bits_for_superframe(GetBitContext *orig_gb,
      ^
1645.                                      WMAVoiceContext *s)
1646. {

libavcodec/wmavoice.c:1647:5: 
1645.                                      WMAVoiceContext *s)
1646. {
1647.     GetBitContext s_gb, *gb = &s_gb;
          ^
1648.     int n, need_bits, bd_idx;
1649.     const struct frame_type_desc *frame_desc;

libavcodec/wmavoice.c:1652:5: 
1650. 
1651.     /* initialize a copy */
1652.     init_get_bits(gb, orig_gb->buffer, orig_gb->size_in_bits);
          ^
1653.     skip_bits_long(gb, get_bits_count(orig_gb));
1654.     assert(get_bits_left(gb) == get_bits_left(orig_gb));

libavcodec/get_bits.h:383:1: start of procedure init_get_bits()
  381.  * responsible for checking for the buffer end yourself (take advantage of the padding)!
  382.  */
  383. static inline void init_get_bits(GetBitContext *s,
       ^
  384.                    const uint8_t *buffer, int bit_size)
  385. {

libavcodec/get_bits.h:386:5: 
  384.                    const uint8_t *buffer, int bit_size)
  385. {
  386.     int buffer_size = (bit_size+7)>>3;
           ^
  387.     if (buffer_size < 0 || bit_size < 0) {
  388.         buffer_size = bit_size = 0;

libavcodec/get_bits.h:387:9: Taking true branch
  385. {
  386.     int buffer_size = (bit_size+7)>>3;
  387.     if (buffer_size < 0 || bit_size < 0) {
               ^
  388.         buffer_size = bit_size = 0;
  389.         buffer = NULL;

libavcodec/get_bits.h:388:9: 
  386.     int buffer_size = (bit_size+7)>>3;
  387.     if (buffer_size < 0 || bit_size < 0) {
  388.         buffer_size = bit_size = 0;
               ^
  389.         buffer = NULL;
  390.     }

libavcodec/get_bits.h:389:9: 
  387.     if (buffer_size < 0 || bit_size < 0) {
  388.         buffer_size = bit_size = 0;
  389.         buffer = NULL;
               ^
  390.     }
  391. 

libavcodec/get_bits.h:392:5: 
  390.     }
  391. 
  392.     s->buffer       = buffer;
           ^
  393.     s->size_in_bits = bit_size;
  394.     s->buffer_end   = buffer + buffer_size;

libavcodec/get_bits.h:393:5: 
  391. 
  392.     s->buffer       = buffer;
  393.     s->size_in_bits = bit_size;
           ^
  394.     s->buffer_end   = buffer + buffer_size;
  395. #ifdef ALT_BITSTREAM_READER

libavcodec/get_bits.h:394:5: 
  392.     s->buffer       = buffer;
  393.     s->size_in_bits = bit_size;
  394.     s->buffer_end   = buffer + buffer_size;
           ^
  395. #ifdef ALT_BITSTREAM_READER
  396.     s->index        = 0;

libavcodec/get_bits.h:396:5: 
  394.     s->buffer_end   = buffer + buffer_size;
  395. #ifdef ALT_BITSTREAM_READER
  396.     s->index        = 0;
           ^
  397. #elif defined A32_BITSTREAM_READER
  398.     s->buffer_ptr   = (uint32_t*)((intptr_t)buffer & ~3);

libavcodec/get_bits.h:402:1: return from a call to init_get_bits
  400.     skip_bits_long(s, 0);
  401. #endif
  402. }
       ^
  403. 
  404. static inline void align_get_bits(GetBitContext *s)

libavcodec/wmavoice.c:1653:5: 
1651.     /* initialize a copy */
1652.     init_get_bits(gb, orig_gb->buffer, orig_gb->size_in_bits);
1653.     skip_bits_long(gb, get_bits_count(orig_gb));
          ^
1654.     assert(get_bits_left(gb) == get_bits_left(orig_gb));
1655. 

libavcodec/get_bits.h:169:1: start of procedure get_bits_count()
  167. #   define GET_CACHE(name, gb) ((uint32_t)name##_cache)
  168. 
  169. static inline int get_bits_count(const GetBitContext *s){
       ^
  170.     return s->index;
  171. }

libavcodec/get_bits.h:170:5: 
  168. 
  169. static inline int get_bits_count(const GetBitContext *s){
  170.     return s->index;
           ^
  171. }
  172. 

libavcodec/get_bits.h:171:1: return from a call to get_bits_count
  169. static inline int get_bits_count(const GetBitContext *s){
  170.     return s->index;
  171. }
       ^
  172. 
  173. static inline void skip_bits_long(GetBitContext *s, int n){

libavcodec/get_bits.h:173:1: start of procedure skip_bits_long()
  171. }
  172. 
  173. static inline void skip_bits_long(GetBitContext *s, int n){
       ^
  174.     s->index += n;
  175. }

libavcodec/get_bits.h:174:5: 
  172. 
  173. static inline void skip_bits_long(GetBitContext *s, int n){
  174.     s->index += n;
           ^
  175. }
  176. 

libavcodec/get_bits.h:175:1: return from a call to skip_bits_long
  173. static inline void skip_bits_long(GetBitContext *s, int n){
  174.     s->index += n;
  175. }
       ^
  176. 
  177. #elif defined A32_BITSTREAM_READER

libavcodec/wmavoice.c:1654:5: 
1652.     init_get_bits(gb, orig_gb->buffer, orig_gb->size_in_bits);
1653.     skip_bits_long(gb, get_bits_count(orig_gb));
1654.     assert(get_bits_left(gb) == get_bits_left(orig_gb));
          ^
1655. 
1656.     /* superframe header */

libavcodec/wmavoice.c:1657:9: 
1655. 
1656.     /* superframe header */
1657.     if (get_bits_left(gb) < 14)
              ^
1658.         return 1;
1659.     if (!get_bits1(gb))

libavcodec/get_bits.h:536:1: start of procedure get_bits_left()
  534. }
  535. 
  536. static inline int get_bits_left(GetBitContext *gb)
       ^
  537. {
  538.     return gb->size_in_bits - get_bits_count(gb);

libavcodec/get_bits.h:538:5: 
  536. static inline int get_bits_left(GetBitContext *gb)
  537. {
  538.     return gb->size_in_bits - get_bits_count(gb);
           ^
  539. }
  540. 

libavcodec/get_bits.h:169:1: start of procedure get_bits_count()
    167. #   define GET_CACHE(name, gb) ((uint32_t)name##_cache)
    168. 
    169. static inline int get_bits_count(const GetBitContext *s){
         ^
    170.     return s->index;
    171. }

libavcodec/get_bits.h:170:5: 
    168. 
    169. static inline int get_bits_count(const GetBitContext *s){
    170.     return s->index;
             ^
    171. }
    172. 

libavcodec/get_bits.h:171:1: return from a call to get_bits_count
    169. static inline int get_bits_count(const GetBitContext *s){
    170.     return s->index;
    171. }
         ^
    172. 
    173. static inline void skip_bits_long(GetBitContext *s, int n){

libavcodec/get_bits.h:539:1: return from a call to get_bits_left
  537. {
  538.     return gb->size_in_bits - get_bits_count(gb);
  539. }
       ^
  540. 
  541. //#define TRACE

libavcodec/wmavoice.c:1657:9: Taking false branch
1655. 
1656.     /* superframe header */
1657.     if (get_bits_left(gb) < 14)
              ^
1658.         return 1;
1659.     if (!get_bits1(gb))

libavcodec/wmavoice.c:1659:10: 
1657.     if (get_bits_left(gb) < 14)
1658.         return 1;
1659.     if (!get_bits1(gb))
               ^
1660.         return -1;                        // WMAPro-in-WMAVoice superframe
1661.     if (get_bits1(gb)) skip_bits(gb, 12); // number of  samples in superframe

libavcodec/get_bits.h:303:1: start of procedure get_bits1()
  301. }
  302. 
  303. static inline unsigned int get_bits1(GetBitContext *s){
       ^
  304. #ifdef ALT_BITSTREAM_READER
  305.     unsigned int index = s->index;

libavcodec/get_bits.h:305:5: 
  303. static inline unsigned int get_bits1(GetBitContext *s){
  304. #ifdef ALT_BITSTREAM_READER
  305.     unsigned int index = s->index;
           ^
  306.     uint8_t result = s->buffer[index>>3];
  307. #ifdef ALT_BITSTREAM_READER_LE

libavcodec/get_bits.h:306:5: 
  304. #ifdef ALT_BITSTREAM_READER
  305.     unsigned int index = s->index;
  306.     uint8_t result = s->buffer[index>>3];
           ^
  307. #ifdef ALT_BITSTREAM_READER_LE
  308.     result >>= index & 7;
