libavcodec/flac.c:152: error: Null Dereference
  pointer `&gb->buffer` last assigned on line 149 could be null and is dereferenced by call to `get_bits()` at line 152, column 24.

libavcodec/flac.c:145:1: start of procedure ff_flac_parse_streaminfo()
143. }
144. 
145. void ff_flac_parse_streaminfo(AVCodecContext *avctx, struct FLACStreaminfo *s,
     ^
146.                               const uint8_t *buffer)
147. {

libavcodec/flac.c:149:5: 
147. {
148.     GetBitContext gb;
149.     init_get_bits(&gb, buffer, FLAC_STREAMINFO_SIZE*8);
         ^
150. 
151.     /* mandatory streaminfo */

libavcodec/bitstream.h:758:1: start of procedure init_get_bits()
  756.  * @param bit_size the size of the buffer in bits
  757.  */
  758. static inline void init_get_bits(GetBitContext *s,
       ^
  759.                    const uint8_t *buffer, int bit_size)
  760. {

libavcodec/bitstream.h:761:5: 
  759.                    const uint8_t *buffer, int bit_size)
  760. {
  761.     int buffer_size= (bit_size+7)>>3;
           ^
  762.     if(buffer_size < 0 || bit_size < 0) {
  763.         buffer_size = bit_size = 0;

libavcodec/bitstream.h:762:8: Taking true branch
  760. {
  761.     int buffer_size= (bit_size+7)>>3;
  762.     if(buffer_size < 0 || bit_size < 0) {
              ^
  763.         buffer_size = bit_size = 0;
  764.         buffer = NULL;

libavcodec/bitstream.h:763:9: 
  761.     int buffer_size= (bit_size+7)>>3;
  762.     if(buffer_size < 0 || bit_size < 0) {
  763.         buffer_size = bit_size = 0;
               ^
  764.         buffer = NULL;
  765.     }

libavcodec/bitstream.h:764:9: 
  762.     if(buffer_size < 0 || bit_size < 0) {
  763.         buffer_size = bit_size = 0;
  764.         buffer = NULL;
               ^
  765.     }
  766. 

libavcodec/bitstream.h:767:5: 
  765.     }
  766. 
  767.     s->buffer= buffer;
           ^
  768.     s->size_in_bits= bit_size;
  769.     s->buffer_end= buffer + buffer_size;

libavcodec/bitstream.h:768:5: 
  766. 
  767.     s->buffer= buffer;
  768.     s->size_in_bits= bit_size;
           ^
  769.     s->buffer_end= buffer + buffer_size;
  770. #ifdef ALT_BITSTREAM_READER

libavcodec/bitstream.h:769:5: 
  767.     s->buffer= buffer;
  768.     s->size_in_bits= bit_size;
  769.     s->buffer_end= buffer + buffer_size;
           ^
  770. #ifdef ALT_BITSTREAM_READER
  771.     s->index=0;

libavcodec/bitstream.h:771:5: 
  769.     s->buffer_end= buffer + buffer_size;
  770. #ifdef ALT_BITSTREAM_READER
  771.     s->index=0;
           ^
  772. #elif defined LIBMPEG2_BITSTREAM_READER
  773.     s->buffer_ptr = (uint8_t*)((intptr_t)buffer&(~1));

libavcodec/bitstream.h:781:1: return from a call to init_get_bits
  779.     skip_bits_long(s, 0);
  780. #endif
  781. }
       ^
  782. 
  783. static inline void align_get_bits(GetBitContext *s)

libavcodec/flac.c:152:5: 
150. 
151.     /* mandatory streaminfo */
152.     s->min_blocksize = get_bits(&gb, 16);
         ^
153.     s->max_blocksize = get_bits(&gb, 16);
154. 

libavcodec/bitstream.h:655:1: start of procedure get_bits()
  653.  * Note, the alt bitstream reader can read up to 25 bits, but the libmpeg2 reader can't
  654.  */
  655. static inline unsigned int get_bits(GetBitContext *s, int n){
       ^
  656.     register int tmp;
  657.     OPEN_READER(re, s)

libavcodec/bitstream.h:657:5: 
  655. static inline unsigned int get_bits(GetBitContext *s, int n){
  656.     register int tmp;
  657.     OPEN_READER(re, s)
           ^
  658.     UPDATE_CACHE(re, s)
  659.     tmp= SHOW_UBITS(re, s, n);

libavcodec/bitstream.h:658:5: 
  656.     register int tmp;
  657.     OPEN_READER(re, s)
  658.     UPDATE_CACHE(re, s)
           ^
  659.     tmp= SHOW_UBITS(re, s, n);
  660.     LAST_SKIP_BITS(re, s, n)

void ff_flac_parse_streaminfo(AVCodecContext *avctx, struct FLACStreaminfo *s,
                              const uint8_t *buffer)
{
    GetBitContext gb;
    init_get_bits(&gb, buffer, FLAC_STREAMINFO_SIZE*8);
    s->min_blocksize = get_bits(&gb, 16);
    s->max_blocksize = get_bits(&gb, 16);
    skip_bits(&gb, 24);
    s->max_framesize = get_bits_long(&gb, 24);
    s->samplerate = get_bits_long(&gb, 20);
    s->channels = get_bits(&gb, 3) + 1;
    s->bps = get_bits(&gb, 5) + 1;
    avctx->channels = s->channels;
    avctx->sample_rate = s->samplerate;
    skip_bits(&gb, 36);
    skip_bits(&gb, 64);
    skip_bits(&gb, 64);
    dump_headers(avctx, s);
}
['void ff_flac_parse_streaminfo(AVCodecContext *avctx, struct FLACStreaminfo *s,\n                              const uint8_t *buffer)\n{\n    GetBitContext gb;\n    init_get_bits(&gb, buffer, FLAC_STREAMINFO_SIZE*8);\n    s->min_blocksize = get_bits(&gb, 16);\n    s->max_blocksize = get_bits(&gb, 16);\n    skip_bits(&gb, 24);\n    s->max_framesize = get_bits_long(&gb, 24);\n    s->samplerate = get_bits_long(&gb, 20);\n    s->channels = get_bits(&gb, 3) + 1;\n    s->bps = get_bits(&gb, 5) + 1;\n    avctx->channels = s->channels;\n    avctx->sample_rate = s->samplerate;\n    skip_bits(&gb, 36);\n    skip_bits(&gb, 64);\n    skip_bits(&gb, 64);\n    dump_headers(avctx, s);\n}', 'static inline void init_get_bits(GetBitContext *s,\n                   const uint8_t *buffer, int bit_size)\n{\n    int buffer_size= (bit_size+7)>>3;\n    if(buffer_size < 0 || bit_size < 0) {\n        buffer_size = bit_size = 0;\n        buffer = NULL;\n    }\n    s->buffer= buffer;\n    s->size_in_bits= bit_size;\n    s->buffer_end= buffer + buffer_size;\n#ifdef ALT_BITSTREAM_READER\n    s->index=0;\n#elif defined LIBMPEG2_BITSTREAM_READER\n    s->buffer_ptr = (uint8_t*)((intptr_t)buffer&(~1));\n    s->bit_count = 16 + 8*((intptr_t)buffer&1);\n    skip_bits_long(s, 0);\n#elif defined A32_BITSTREAM_READER\n    s->buffer_ptr = (uint32_t*)((intptr_t)buffer&(~3));\n    s->bit_count = 32 + 8*((intptr_t)buffer&3);\n    skip_bits_long(s, 0);\n#endif\n}', 'static inline unsigned int get_bits(GetBitContext *s, int n){\n    register int tmp;\n    OPEN_READER(re, s)\n    UPDATE_CACHE(re, s)\n    tmp= SHOW_UBITS(re, s, n);\n    LAST_SKIP_BITS(re, s, n)\n    CLOSE_READER(re, s)\n    return tmp;\n}']