libavcodec/xan.c:115: error: Null Dereference
  pointer `&gb->buffer` last assigned on line 112 could be null and is dereferenced by call to `get_bits1()` at line 115, column 37.

libavcodec/xan.c:98:1: start of procedure xan_huffman_decode()
 96. }
 97. 
 98. static int xan_huffman_decode(unsigned char *dest, int dest_len,
     ^
 99.                               const unsigned char *src, int src_len)
100. {

libavcodec/xan.c:101:5: 
 99.                               const unsigned char *src, int src_len)
100. {
101.     unsigned char byte = *src++;
         ^
102.     unsigned char ival = byte + 0x16;
103.     const unsigned char * ptr = src + byte*2;

libavcodec/xan.c:102:5: 
100. {
101.     unsigned char byte = *src++;
102.     unsigned char ival = byte + 0x16;
         ^
103.     const unsigned char * ptr = src + byte*2;
104.     int ptr_len = src_len - 1 - byte*2;

libavcodec/xan.c:103:5: 
101.     unsigned char byte = *src++;
102.     unsigned char ival = byte + 0x16;
103.     const unsigned char * ptr = src + byte*2;
         ^
104.     int ptr_len = src_len - 1 - byte*2;
105.     unsigned char val = ival;

libavcodec/xan.c:104:5: 
102.     unsigned char ival = byte + 0x16;
103.     const unsigned char * ptr = src + byte*2;
104.     int ptr_len = src_len - 1 - byte*2;
         ^
105.     unsigned char val = ival;
106.     unsigned char *dest_end = dest + dest_len;

libavcodec/xan.c:105:5: 
103.     const unsigned char * ptr = src + byte*2;
104.     int ptr_len = src_len - 1 - byte*2;
105.     unsigned char val = ival;
         ^
106.     unsigned char *dest_end = dest + dest_len;
107.     GetBitContext gb;

libavcodec/xan.c:106:5: 
104.     int ptr_len = src_len - 1 - byte*2;
105.     unsigned char val = ival;
106.     unsigned char *dest_end = dest + dest_len;
         ^
107.     GetBitContext gb;
108. 

libavcodec/xan.c:109:9: Taking false branch
107.     GetBitContext gb;
108. 
109.     if (ptr_len < 0)
             ^
110.         return AVERROR_INVALIDDATA;
111. 

libavcodec/xan.c:112:5: 
110.         return AVERROR_INVALIDDATA;
111. 
112.     init_get_bits(&gb, ptr, ptr_len * 8);
         ^
113. 
114.     while ( val != 0x16 ) {

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/xan.c:114:13: Loop condition is true. Entering loop body
112.     init_get_bits(&gb, ptr, ptr_len * 8);
113. 
114.     while ( val != 0x16 ) {
                 ^
115.         unsigned idx = val - 0x17 + get_bits1(&gb) * byte;
116.         if (idx >= 2 * byte)

libavcodec/xan.c:115:9: 
113. 
114.     while ( val != 0x16 ) {
115.         unsigned idx = val - 0x17 + get_bits1(&gb) * byte;
             ^
116.         if (idx >= 2 * byte)
117.             return -1;

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;
