libavcodec/mpc7.c:182: error: Null Dereference
  pointer `&gb->buffer` last assigned on line 181 could be null and is dereferenced by call to `skip_bits()` at line 182, column 5.

libavcodec/mpc7.c:161:1: start of procedure mpc7_decode_frame()
159. }
160. 
161. static int mpc7_decode_frame(AVCodecContext * avctx,
     ^
162.                             void *data, int *data_size,
163.                             const uint8_t * buf, int buf_size)

libavcodec/mpc7.c:165:5: 
163.                             const uint8_t * buf, int buf_size)
164. {
165.     MPCContext *c = avctx->priv_data;
         ^
166.     GetBitContext gb;
167.     uint8_t *bits;

libavcodec/mpc7.c:169:5: 
167.     uint8_t *bits;
168.     int i, ch, t;
169.     int mb = -1;
         ^
170.     Band *bands = c->bands;
171.     int off;

libavcodec/mpc7.c:170:5: 
168.     int i, ch, t;
169.     int mb = -1;
170.     Band *bands = c->bands;
         ^
171.     int off;
172.     int bits_used, bits_avail;

libavcodec/mpc7.c:174:5: 
172.     int bits_used, bits_avail;
173. 
174.     memset(bands, 0, sizeof(bands));
         ^
175.     if(buf_size <= 4){
176.         av_log(avctx, AV_LOG_ERROR, "Too small buffer passed (%i bytes)\n", buf_size);

libavcodec/mpc7.c:175:8: Taking true branch
173. 
174.     memset(bands, 0, sizeof(bands));
175.     if(buf_size <= 4){
            ^
176.         av_log(avctx, AV_LOG_ERROR, "Too small buffer passed (%i bytes)\n", buf_size);
177.     }

libavcodec/mpc7.c:176:9: Skipping av_log(): empty list of specs
174.     memset(bands, 0, sizeof(bands));
175.     if(buf_size <= 4){
176.         av_log(avctx, AV_LOG_ERROR, "Too small buffer passed (%i bytes)\n", buf_size);
             ^
177.     }
178. 

libavcodec/mpc7.c:179:5: 
177.     }
178. 
179.     bits = av_malloc(((buf_size - 1) & ~3) + FF_INPUT_BUFFER_PADDING_SIZE);
         ^
180.     c->dsp.bswap_buf((uint32_t*)bits, (const uint32_t*)(buf + 4), (buf_size - 4) >> 2);
181.     init_get_bits(&gb, bits, (buf_size - 4)* 8);

libavutil/mem.c:42:1: start of procedure av_malloc()
  40.    linker will do it automatically */
  41. 
  42. void *av_malloc(unsigned int size)
      ^
  43. {
  44.     void *ptr;

libavutil/mem.c:50:8: Taking true branch
  48. 
  49.     /* let's disallow possible ambiguous cases */
  50.     if(size > (INT_MAX-16) )
             ^
  51.         return NULL;
  52. 

libavutil/mem.c:51:9: 
  49.     /* let's disallow possible ambiguous cases */
  50.     if(size > (INT_MAX-16) )
  51.         return NULL;
              ^
  52. 
  53. #ifdef CONFIG_MEMALIGN_HACK

libavutil/mem.c:92:1: return from a call to av_malloc
  90. #endif
  91.     return ptr;
  92. }
      ^
  93. 
  94. void *av_realloc(void *ptr, unsigned int size)

libavcodec/mpc7.c:180:5: Skipping __function_pointer__(): unresolved function pointer
178. 
179.     bits = av_malloc(((buf_size - 1) & ~3) + FF_INPUT_BUFFER_PADDING_SIZE);
180.     c->dsp.bswap_buf((uint32_t*)bits, (const uint32_t*)(buf + 4), (buf_size - 4) >> 2);
         ^
181.     init_get_bits(&gb, bits, (buf_size - 4)* 8);
182.     skip_bits(&gb, buf[0]);

libavcodec/mpc7.c:181:5: 
179.     bits = av_malloc(((buf_size - 1) & ~3) + FF_INPUT_BUFFER_PADDING_SIZE);
180.     c->dsp.bswap_buf((uint32_t*)bits, (const uint32_t*)(buf + 4), (buf_size - 4) >> 2);
181.     init_get_bits(&gb, bits, (buf_size - 4)* 8);
         ^
182.     skip_bits(&gb, buf[0]);
183. 

libavcodec/bitstream.h:745:1: start of procedure init_get_bits()
  743.  * @param bit_size the size of the buffer in bits
  744.  */
  745. static inline void init_get_bits(GetBitContext *s,
       ^
  746.                    const uint8_t *buffer, int bit_size)
  747. {

libavcodec/bitstream.h:748:5: 
  746.                    const uint8_t *buffer, int bit_size)
  747. {
  748.     int buffer_size= (bit_size+7)>>3;
           ^
  749.     if(buffer_size < 0 || bit_size < 0) {
  750.         buffer_size = bit_size = 0;

libavcodec/bitstream.h:749:8: Taking false branch
  747. {
  748.     int buffer_size= (bit_size+7)>>3;
  749.     if(buffer_size < 0 || bit_size < 0) {
              ^
  750.         buffer_size = bit_size = 0;
  751.         buffer = NULL;

libavcodec/bitstream.h:749:27: Taking false branch
  747. {
  748.     int buffer_size= (bit_size+7)>>3;
  749.     if(buffer_size < 0 || bit_size < 0) {
                                 ^
  750.         buffer_size = bit_size = 0;
  751.         buffer = NULL;

libavcodec/bitstream.h:754:5: 
  752.     }
  753. 
  754.     s->buffer= buffer;
           ^
  755.     s->size_in_bits= bit_size;
  756.     s->buffer_end= buffer + buffer_size;

libavcodec/bitstream.h:755:5: 
  753. 
  754.     s->buffer= buffer;
  755.     s->size_in_bits= bit_size;
           ^
  756.     s->buffer_end= buffer + buffer_size;
  757. #ifdef ALT_BITSTREAM_READER

libavcodec/bitstream.h:756:5: 
  754.     s->buffer= buffer;
  755.     s->size_in_bits= bit_size;
  756.     s->buffer_end= buffer + buffer_size;
           ^
  757. #ifdef ALT_BITSTREAM_READER
  758.     s->index=0;

libavcodec/bitstream.h:758:5: 
  756.     s->buffer_end= buffer + buffer_size;
  757. #ifdef ALT_BITSTREAM_READER
  758.     s->index=0;
           ^
  759. #elif defined LIBMPEG2_BITSTREAM_READER
  760.     s->buffer_ptr = (uint8_t*)((intptr_t)buffer&(~1));

libavcodec/bitstream.h:768:1: return from a call to init_get_bits
  766.     skip_bits_long(s, 0);
  767. #endif
  768. }
       ^
  769. 
  770. static inline void align_get_bits(GetBitContext *s)

libavcodec/mpc7.c:182:5: 
180.     c->dsp.bswap_buf((uint32_t*)bits, (const uint32_t*)(buf + 4), (buf_size - 4) >> 2);
181.     init_get_bits(&gb, bits, (buf_size - 4)* 8);
182.     skip_bits(&gb, buf[0]);
         ^
183. 
184.     /* read subband indexes */

libavcodec/bitstream.h:665:1: start of procedure skip_bits()
  663. }
  664. 
  665. static inline void skip_bits(GetBitContext *s, int n){
       ^
  666.  //Note gcc seems to optimize this to s->index+=n for the ALT_READER :))
  667.     OPEN_READER(re, s)

libavcodec/bitstream.h:667:5: 
  665. static inline void skip_bits(GetBitContext *s, int n){
  666.  //Note gcc seems to optimize this to s->index+=n for the ALT_READER :))
  667.     OPEN_READER(re, s)
           ^
  668.     UPDATE_CACHE(re, s)
  669.     LAST_SKIP_BITS(re, s, n)

libavcodec/bitstream.h:668:5: 
  666.  //Note gcc seems to optimize this to s->index+=n for the ALT_READER :))
  667.     OPEN_READER(re, s)
  668.     UPDATE_CACHE(re, s)
           ^
  669.     LAST_SKIP_BITS(re, s, n)
  670.     CLOSE_READER(re, s)
