libavformat/adtsenc.c:41: error: Null Dereference
  pointer `&gb->buffer` last assigned on line 40 could be null and is dereferenced by call to `get_bits()` at line 41, column 24.

libavformat/adtsenc.c:36:1: start of procedure decode_extradata()
34. } ADTSContext;
35. 
36. static int decode_extradata(AVFormatContext *s, ADTSContext *adts, uint8_t *buf, int size)
    ^
37. {
38.     GetBitContext gb;

libavformat/adtsenc.c:40:5: 
38.     GetBitContext gb;
39. 
40.     init_get_bits(&gb, buf, size * 8);
        ^
41.     adts->objecttype = get_bits(&gb, 5) - 1;
42.     adts->sample_rate_index = get_bits(&gb, 4);

libavcodec/bitstream.h:737:1: start of procedure init_get_bits()
  735.  * @param bit_size the size of the buffer in bits
  736.  */
  737. static inline void init_get_bits(GetBitContext *s,
       ^
  738.                    const uint8_t *buffer, int bit_size)
  739. {

libavcodec/bitstream.h:740:5: 
  738.                    const uint8_t *buffer, int bit_size)
  739. {
  740.     int buffer_size= (bit_size+7)>>3;
           ^
  741.     if(buffer_size < 0 || bit_size < 0) {
  742.         buffer_size = bit_size = 0;

libavcodec/bitstream.h:741:8: Taking true branch
  739. {
  740.     int buffer_size= (bit_size+7)>>3;
  741.     if(buffer_size < 0 || bit_size < 0) {
              ^
  742.         buffer_size = bit_size = 0;
  743.         buffer = NULL;

libavcodec/bitstream.h:742:9: 
  740.     int buffer_size= (bit_size+7)>>3;
  741.     if(buffer_size < 0 || bit_size < 0) {
  742.         buffer_size = bit_size = 0;
               ^
  743.         buffer = NULL;
  744.     }

libavcodec/bitstream.h:743:9: 
  741.     if(buffer_size < 0 || bit_size < 0) {
  742.         buffer_size = bit_size = 0;
  743.         buffer = NULL;
               ^
  744.     }
  745. 

libavcodec/bitstream.h:746:5: 
  744.     }
  745. 
  746.     s->buffer= buffer;
           ^
  747.     s->size_in_bits= bit_size;
  748.     s->buffer_end= buffer + buffer_size;

libavcodec/bitstream.h:747:5: 
  745. 
  746.     s->buffer= buffer;
  747.     s->size_in_bits= bit_size;
           ^
  748.     s->buffer_end= buffer + buffer_size;
  749. #ifdef ALT_BITSTREAM_READER

libavcodec/bitstream.h:748:5: 
  746.     s->buffer= buffer;
  747.     s->size_in_bits= bit_size;
  748.     s->buffer_end= buffer + buffer_size;
           ^
  749. #ifdef ALT_BITSTREAM_READER
  750.     s->index=0;

libavcodec/bitstream.h:750:5: 
  748.     s->buffer_end= buffer + buffer_size;
  749. #ifdef ALT_BITSTREAM_READER
  750.     s->index=0;
           ^
  751. #elif defined LIBMPEG2_BITSTREAM_READER
  752.     s->buffer_ptr = (uint8_t*)((intptr_t)buffer&(~1));

libavcodec/bitstream.h:760:1: return from a call to init_get_bits
  758.     skip_bits_long(s, 0);
  759. #endif
  760. }
       ^
  761. 
  762. static inline void align_get_bits(GetBitContext *s)

libavformat/adtsenc.c:41:5: 
39. 
40.     init_get_bits(&gb, buf, size * 8);
41.     adts->objecttype = get_bits(&gb, 5) - 1;
        ^
42.     adts->sample_rate_index = get_bits(&gb, 4);
43.     adts->channel_conf = get_bits(&gb, 4);

libavcodec/bitstream.h:634:1: start of procedure get_bits()
  632.  * Note, the alt bitstream reader can read up to 25 bits, but the libmpeg2 reader can't
  633.  */
  634. static inline unsigned int get_bits(GetBitContext *s, int n){
       ^
  635.     register int tmp;
  636.     OPEN_READER(re, s)

libavcodec/bitstream.h:636:5: 
  634. static inline unsigned int get_bits(GetBitContext *s, int n){
  635.     register int tmp;
  636.     OPEN_READER(re, s)
           ^
  637.     UPDATE_CACHE(re, s)
  638.     tmp= SHOW_UBITS(re, s, n);

libavcodec/bitstream.h:637:5: 
  635.     register int tmp;
  636.     OPEN_READER(re, s)
  637.     UPDATE_CACHE(re, s)
           ^
  638.     tmp= SHOW_UBITS(re, s, n);
  639.     LAST_SKIP_BITS(re, s, n)

static int decode_extradata(AVFormatContext *s, ADTSContext *adts, uint8_t *buf, int size)
{
    GetBitContext gb;
    init_get_bits(&gb, buf, size * 8);
    adts->objecttype = get_bits(&gb, 5) - 1;
    adts->sample_rate_index = get_bits(&gb, 4);
    adts->channel_conf = get_bits(&gb, 4);
    if (adts->objecttype > 3) {
        av_log(s, AV_LOG_ERROR, "MPEG-4 AOT %d is not allowed in ADTS\n", adts->objecttype+1);
        return -1;
    }
    if (adts->sample_rate_index == 15) {
        av_log(s, AV_LOG_ERROR, "Escape sample rate index illegal in ADTS\n");
        return -1;
    }
    if (adts->channel_conf == 0) {
        ff_log_missing_feature(s, "PCE based channel configuration", 0);
        return -1;
    }
    adts->write_adts = 1;
    return 0;
}
['static int decode_extradata(AVFormatContext *s, ADTSContext *adts, uint8_t *buf, int size)\n{\n    GetBitContext gb;\n    init_get_bits(&gb, buf, size * 8);\n    adts->objecttype = get_bits(&gb, 5) - 1;\n    adts->sample_rate_index = get_bits(&gb, 4);\n    adts->channel_conf = get_bits(&gb, 4);\n    if (adts->objecttype > 3) {\n        av_log(s, AV_LOG_ERROR, "MPEG-4 AOT %d is not allowed in ADTS\\n", adts->objecttype+1);\n        return -1;\n    }\n    if (adts->sample_rate_index == 15) {\n        av_log(s, AV_LOG_ERROR, "Escape sample rate index illegal in ADTS\\n");\n        return -1;\n    }\n    if (adts->channel_conf == 0) {\n        ff_log_missing_feature(s, "PCE based channel configuration", 0);\n        return -1;\n    }\n    adts->write_adts = 1;\n    return 0;\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}']