libavcodec/flashsvenc.c:148: error: Null Dereference
  pointer `&pb->buf_ptr` last assigned on line 143 could be null and is dereferenced by call to `put_bits()` at line 148, column 5.

libavcodec/flashsvenc.c:135:1: start of procedure encode_bitstream()
133. 
134. 
135. static int encode_bitstream(FlashSVContext *s, AVFrame *p, uint8_t *buf, int buf_size,
     ^
136.      int block_width, int block_height, uint8_t *previous_frame, int* I_frame) {
137. 

libavcodec/flashsvenc.c:141:5: 
139.     int h_blocks, v_blocks, h_part, v_part, i, j;
140.     int buf_pos, res;
141.     int pred_blocks = 0;
         ^
142. 
143.     init_put_bits(&pb, buf, buf_size*8);

libavcodec/flashsvenc.c:143:5: 
141.     int pred_blocks = 0;
142. 
143.     init_put_bits(&pb, buf, buf_size*8);
         ^
144. 
145.     put_bits(&pb, 4, (block_width/16)-1);

libavcodec/put_bits.h:60:1: start of procedure init_put_bits()
  58.  * @param buffer_size the size in bytes of buffer
  59.  */
  60. static inline void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
      ^
  61. {
  62.     if(buffer_size < 0) {

libavcodec/put_bits.h:62:8: Taking true branch
  60. static inline void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
  61. {
  62.     if(buffer_size < 0) {
             ^
  63.         buffer_size = 0;
  64.         buffer = NULL;

libavcodec/put_bits.h:63:9: 
  61. {
  62.     if(buffer_size < 0) {
  63.         buffer_size = 0;
              ^
  64.         buffer = NULL;
  65.     }

libavcodec/put_bits.h:64:9: 
  62.     if(buffer_size < 0) {
  63.         buffer_size = 0;
  64.         buffer = NULL;
              ^
  65.     }
  66. 

libavcodec/put_bits.h:67:5: 
  65.     }
  66. 
  67.     s->size_in_bits= 8*buffer_size;
          ^
  68.     s->buf = buffer;
  69.     s->buf_end = s->buf + buffer_size;

libavcodec/put_bits.h:68:5: 
  66. 
  67.     s->size_in_bits= 8*buffer_size;
  68.     s->buf = buffer;
          ^
  69.     s->buf_end = s->buf + buffer_size;
  70. #ifdef ALT_BITSTREAM_WRITER

libavcodec/put_bits.h:69:5: 
  67.     s->size_in_bits= 8*buffer_size;
  68.     s->buf = buffer;
  69.     s->buf_end = s->buf + buffer_size;
          ^
  70. #ifdef ALT_BITSTREAM_WRITER
  71.     s->index=0;

libavcodec/put_bits.h:75:5: 
  73. //    memset(buffer, 0, buffer_size);
  74. #else
  75.     s->buf_ptr = s->buf;
          ^
  76.     s->bit_left=32;
  77.     s->bit_buf=0;

libavcodec/put_bits.h:76:5: 
  74. #else
  75.     s->buf_ptr = s->buf;
  76.     s->bit_left=32;
          ^
  77.     s->bit_buf=0;
  78. #endif

libavcodec/put_bits.h:77:5: 
  75.     s->buf_ptr = s->buf;
  76.     s->bit_left=32;
  77.     s->bit_buf=0;
          ^
  78. #endif
  79. }

libavcodec/put_bits.h:79:1: return from a call to init_put_bits
  77.     s->bit_buf=0;
  78. #endif
  79. }
      ^
  80. 
  81. /**

libavcodec/flashsvenc.c:145:5: 
143.     init_put_bits(&pb, buf, buf_size*8);
144. 
145.     put_bits(&pb, 4, (block_width/16)-1);
         ^
146.     put_bits(&pb, 12, s->image_width);
147.     put_bits(&pb, 4, (block_height/16)-1);

libavcodec/put_bits.h:139:1: start of procedure put_bits()
  137. void ff_copy_bits(PutBitContext *pb, const uint8_t *src, int length);
  138. 
  139. static inline void put_bits(PutBitContext *s, int n, unsigned int value)
       ^
  140. #ifndef ALT_BITSTREAM_WRITER
  141. {

libavcodec/put_bits.h:146:5: 
  144. 
  145.     //    printf("put_bits=%d %x\n", n, value);
  146.     assert(n == 32 || value < (1U << n));
           ^
  147. 
  148.     bit_buf = s->bit_buf;

libavcodec/put_bits.h:148:5: 
  146.     assert(n == 32 || value < (1U << n));
  147. 
  148.     bit_buf = s->bit_buf;
           ^
  149.     bit_left = s->bit_left;
  150. 

libavcodec/put_bits.h:149:5: 
  147. 
  148.     bit_buf = s->bit_buf;
  149.     bit_left = s->bit_left;
           ^
  150. 
  151.     //    printf("n=%d value=%x cnt=%d buf=%x\n", n, value, bit_cnt, bit_buf);

libavcodec/put_bits.h:168:9: Taking true branch
  166.     bit_left-=n;
  167. #else
  168.     if (n < bit_left) {
               ^
  169.         bit_buf = (bit_buf<<n) | value;
  170.         bit_left-=n;

libavcodec/put_bits.h:169:9: 
  167. #else
  168.     if (n < bit_left) {
  169.         bit_buf = (bit_buf<<n) | value;
               ^
  170.         bit_left-=n;
  171.     } else {

libavcodec/put_bits.h:170:9: 
  168.     if (n < bit_left) {
  169.         bit_buf = (bit_buf<<n) | value;
  170.         bit_left-=n;
               ^
  171.     } else {
  172.         bit_buf<<=bit_left;

libavcodec/put_bits.h:187:5: 
  185. #endif
  186. 
  187.     s->bit_buf = bit_buf;
           ^
  188.     s->bit_left = bit_left;
  189. }

libavcodec/put_bits.h:188:5: 
  186. 
  187.     s->bit_buf = bit_buf;
  188.     s->bit_left = bit_left;
           ^
  189. }
  190. #else  /* ALT_BITSTREAM_WRITER defined */

libavcodec/put_bits.h:189:1: return from a call to put_bits
  187.     s->bit_buf = bit_buf;
  188.     s->bit_left = bit_left;
  189. }
       ^
  190. #else  /* ALT_BITSTREAM_WRITER defined */
  191. {

libavcodec/flashsvenc.c:146:5: 
144. 
145.     put_bits(&pb, 4, (block_width/16)-1);
146.     put_bits(&pb, 12, s->image_width);
         ^
147.     put_bits(&pb, 4, (block_height/16)-1);
148.     put_bits(&pb, 12, s->image_height);

libavcodec/put_bits.h:139:1: start of procedure put_bits()
  137. void ff_copy_bits(PutBitContext *pb, const uint8_t *src, int length);
  138. 
  139. static inline void put_bits(PutBitContext *s, int n, unsigned int value)
       ^
  140. #ifndef ALT_BITSTREAM_WRITER
  141. {

libavcodec/put_bits.h:146:5: 
  144. 
  145.     //    printf("put_bits=%d %x\n", n, value);
  146.     assert(n == 32 || value < (1U << n));
           ^
  147. 
  148.     bit_buf = s->bit_buf;

libavcodec/put_bits.h:148:5: 
  146.     assert(n == 32 || value < (1U << n));
  147. 
  148.     bit_buf = s->bit_buf;
           ^
  149.     bit_left = s->bit_left;
  150. 

libavcodec/put_bits.h:149:5: 
  147. 
  148.     bit_buf = s->bit_buf;
  149.     bit_left = s->bit_left;
           ^
  150. 
  151.     //    printf("n=%d value=%x cnt=%d buf=%x\n", n, value, bit_cnt, bit_buf);

libavcodec/put_bits.h:168:9: Taking true branch
  166.     bit_left-=n;
  167. #else
  168.     if (n < bit_left) {
               ^
  169.         bit_buf = (bit_buf<<n) | value;
  170.         bit_left-=n;

libavcodec/put_bits.h:169:9: 
  167. #else
  168.     if (n < bit_left) {
  169.         bit_buf = (bit_buf<<n) | value;
               ^
  170.         bit_left-=n;
  171.     } else {

libavcodec/put_bits.h:170:9: 
  168.     if (n < bit_left) {
  169.         bit_buf = (bit_buf<<n) | value;
  170.         bit_left-=n;
               ^
  171.     } else {
  172.         bit_buf<<=bit_left;

libavcodec/put_bits.h:187:5: 
  185. #endif
  186. 
  187.     s->bit_buf = bit_buf;
           ^
  188.     s->bit_left = bit_left;
  189. }

libavcodec/put_bits.h:188:5: 
  186. 
  187.     s->bit_buf = bit_buf;
  188.     s->bit_left = bit_left;
           ^
  189. }
  190. #else  /* ALT_BITSTREAM_WRITER defined */

libavcodec/put_bits.h:189:1: return from a call to put_bits
  187.     s->bit_buf = bit_buf;
  188.     s->bit_left = bit_left;
  189. }
       ^
  190. #else  /* ALT_BITSTREAM_WRITER defined */
  191. {

libavcodec/flashsvenc.c:147:5: 
145.     put_bits(&pb, 4, (block_width/16)-1);
146.     put_bits(&pb, 12, s->image_width);
147.     put_bits(&pb, 4, (block_height/16)-1);
         ^
148.     put_bits(&pb, 12, s->image_height);
149.     flush_put_bits(&pb);

libavcodec/put_bits.h:139:1: start of procedure put_bits()
  137. void ff_copy_bits(PutBitContext *pb, const uint8_t *src, int length);
  138. 
  139. static inline void put_bits(PutBitContext *s, int n, unsigned int value)
       ^
  140. #ifndef ALT_BITSTREAM_WRITER
  141. {

libavcodec/put_bits.h:146:5: 
  144. 
  145.     //    printf("put_bits=%d %x\n", n, value);
  146.     assert(n == 32 || value < (1U << n));
           ^
  147. 
  148.     bit_buf = s->bit_buf;

libavcodec/put_bits.h:148:5: 
  146.     assert(n == 32 || value < (1U << n));
  147. 
  148.     bit_buf = s->bit_buf;
           ^
  149.     bit_left = s->bit_left;
  150. 

libavcodec/put_bits.h:149:5: 
  147. 
  148.     bit_buf = s->bit_buf;
  149.     bit_left = s->bit_left;
           ^
  150. 
  151.     //    printf("n=%d value=%x cnt=%d buf=%x\n", n, value, bit_cnt, bit_buf);

libavcodec/put_bits.h:168:9: Taking true branch
  166.     bit_left-=n;
  167. #else
  168.     if (n < bit_left) {
               ^
  169.         bit_buf = (bit_buf<<n) | value;
  170.         bit_left-=n;

libavcodec/put_bits.h:169:9: 
  167. #else
  168.     if (n < bit_left) {
  169.         bit_buf = (bit_buf<<n) | value;
               ^
  170.         bit_left-=n;
  171.     } else {

libavcodec/put_bits.h:170:9: 
  168.     if (n < bit_left) {
  169.         bit_buf = (bit_buf<<n) | value;
  170.         bit_left-=n;
               ^
  171.     } else {
  172.         bit_buf<<=bit_left;

libavcodec/put_bits.h:187:5: 
  185. #endif
  186. 
  187.     s->bit_buf = bit_buf;
           ^
  188.     s->bit_left = bit_left;
  189. }

libavcodec/put_bits.h:188:5: 
  186. 
  187.     s->bit_buf = bit_buf;
  188.     s->bit_left = bit_left;
           ^
  189. }
  190. #else  /* ALT_BITSTREAM_WRITER defined */

libavcodec/put_bits.h:189:1: return from a call to put_bits
  187.     s->bit_buf = bit_buf;
  188.     s->bit_left = bit_left;
  189. }
       ^
  190. #else  /* ALT_BITSTREAM_WRITER defined */
  191. {

libavcodec/flashsvenc.c:148:5: 
146.     put_bits(&pb, 12, s->image_width);
147.     put_bits(&pb, 4, (block_height/16)-1);
148.     put_bits(&pb, 12, s->image_height);
         ^
149.     flush_put_bits(&pb);
150.     buf_pos=4;

libavcodec/put_bits.h:139:1: start of procedure put_bits()
  137. void ff_copy_bits(PutBitContext *pb, const uint8_t *src, int length);
  138. 
  139. static inline void put_bits(PutBitContext *s, int n, unsigned int value)
       ^
  140. #ifndef ALT_BITSTREAM_WRITER
  141. {

libavcodec/put_bits.h:146:5: 
  144. 
  145.     //    printf("put_bits=%d %x\n", n, value);
  146.     assert(n == 32 || value < (1U << n));
           ^
  147. 
  148.     bit_buf = s->bit_buf;

libavcodec/put_bits.h:148:5: 
  146.     assert(n == 32 || value < (1U << n));
  147. 
  148.     bit_buf = s->bit_buf;
           ^
  149.     bit_left = s->bit_left;
  150. 

libavcodec/put_bits.h:149:5: 
  147. 
  148.     bit_buf = s->bit_buf;
  149.     bit_left = s->bit_left;
           ^
  150. 
  151.     //    printf("n=%d value=%x cnt=%d buf=%x\n", n, value, bit_cnt, bit_buf);

libavcodec/put_bits.h:168:9: Taking false branch
  166.     bit_left-=n;
  167. #else
  168.     if (n < bit_left) {
               ^
  169.         bit_buf = (bit_buf<<n) | value;
  170.         bit_left-=n;

libavcodec/put_bits.h:172:9: 
  170.         bit_left-=n;
  171.     } else {
  172.         bit_buf<<=bit_left;
               ^
  173.         bit_buf |= value >> (n - bit_left);
  174. #if !HAVE_FAST_UNALIGNED

libavcodec/put_bits.h:173:9: 
  171.     } else {
  172.         bit_buf<<=bit_left;
  173.         bit_buf |= value >> (n - bit_left);
               ^
  174. #if !HAVE_FAST_UNALIGNED
  175.         if (3 & (intptr_t) s->buf_ptr) {

libavcodec/put_bits.h:175:13: Taking false branch
  173.         bit_buf |= value >> (n - bit_left);
  174. #if !HAVE_FAST_UNALIGNED
  175.         if (3 & (intptr_t) s->buf_ptr) {
                   ^
  176.             AV_WB32(s->buf_ptr, bit_buf);
  177.         } else

libavcodec/put_bits.h:179:9: 
  177.         } else
  178. #endif
  179.         *(uint32_t *)s->buf_ptr = be2me_32(bit_buf);
               ^
  180.         //printf("bitbuf = %08x\n", bit_buf);
  181.         s->buf_ptr+=4;

libavutil/bswap.h:52:1: start of procedure bswap_32()
    50. 
    51. #ifndef bswap_32
    52. static av_always_inline av_const uint32_t bswap_32(uint32_t x)
        ^
    53. {
    54.     x= ((x<<8)&0xFF00FF00) | ((x>>8)&0x00FF00FF);

libavutil/bswap.h:54:5: 
    52. static av_always_inline av_const uint32_t bswap_32(uint32_t x)
    53. {
    54.     x= ((x<<8)&0xFF00FF00) | ((x>>8)&0x00FF00FF);
            ^
    55.     x= (x>>16) | (x<<16);
    56.     return x;

libavutil/bswap.h:55:5: 
    53. {
    54.     x= ((x<<8)&0xFF00FF00) | ((x>>8)&0x00FF00FF);
    55.     x= (x>>16) | (x<<16);
            ^
    56.     return x;
    57. }

libavutil/bswap.h:56:5: 
    54.     x= ((x<<8)&0xFF00FF00) | ((x>>8)&0x00FF00FF);
    55.     x= (x>>16) | (x<<16);
    56.     return x;
            ^
    57. }
    58. #endif

libavutil/bswap.h:57:1: return from a call to bswap_32
    55.     x= (x>>16) | (x<<16);
    56.     return x;
    57. }
        ^
    58. #endif
    59. 

libavcodec/put_bits.h:181:9: 
  179.         *(uint32_t *)s->buf_ptr = be2me_32(bit_buf);
  180.         //printf("bitbuf = %08x\n", bit_buf);
  181.         s->buf_ptr+=4;
               ^
  182.         bit_left+=32 - n;
  183.         bit_buf = value;

libavcodec/put_bits.h:182:9: 
  180.         //printf("bitbuf = %08x\n", bit_buf);
  181.         s->buf_ptr+=4;
  182.         bit_left+=32 - n;
               ^
  183.         bit_buf = value;
  184.     }

libavcodec/put_bits.h:183:9: 
  181.         s->buf_ptr+=4;
  182.         bit_left+=32 - n;
  183.         bit_buf = value;
               ^
  184.     }
  185. #endif

libavcodec/put_bits.h:187:5: 
  185. #endif
  186. 
  187.     s->bit_buf = bit_buf;
           ^
  188.     s->bit_left = bit_left;
  189. }

libavcodec/put_bits.h:188:5: 
  186. 
  187.     s->bit_buf = bit_buf;
  188.     s->bit_left = bit_left;
           ^
  189. }
  190. #else  /* ALT_BITSTREAM_WRITER defined */

libavcodec/put_bits.h:189:1: return from a call to put_bits
  187.     s->bit_buf = bit_buf;
  188.     s->bit_left = bit_left;
  189. }
       ^
  190. #else  /* ALT_BITSTREAM_WRITER defined */
  191. {
